Influence of sulfuric acid solution on the durability of high-performance modified polyphenylene sulfide and polytetrafluoroethylene sewing thread for high-temperature filtration

Abstract

High-temperature filtration is a promising development in particle collection technology. In this field, the filtration efficiency of the filter bag is affected by the surface hairiness of the sewing thread, which has the function of sealing pinholes. A high-performance modified polyphenylene sulfide (MPPS) and polytetrafluoroethylene (PTFE) sewing thread had been prepared. However, the effect of the addition of MPPS fibers on acid resistance of MPPS/PTFE sewing thread was a crucial issue that was still unknown. In this study, surface morphology, tensile properties, and the corrosion mechanism of MPPS/PTFE sewing thread exposed to sulfuric acid (H₂SO₄) solution was investigated under different temperatures, concentrations, and times. It was noticed that the auxiliary agent on the surface of MPPS/PTFE sewing thread was partly removed. Besides, the surface of MPPS fibers was slightly damaged by H₂SO₄ solution. Moreover, the tensile properties showed that the maximum loss of fracture strength and the maximum deviation of elongation at break of MPPS/PTFE sewing thread were around 9.1% and 4.6%, respectively. Hence, it could be concluded that the addition of MPPS fibers had little effect on MPPS/PTFE sewing thread. Furthermore, when the concentration of H₂SO₄ solution did not exceed 10 mol/L, MPPS/PTFE sewing thread showed a good acid resistance. Fourier transform infrared spectroscopy analysis did not show a change in the structure of the benzene ring skeleton of the macromolecular chain in MPPS/PTFE sewing thread after treatment with H₂SO₄ solution. In contrast, the carbon–sulfur bonds attached to the benzene ring in MPPS/PTFE sewing thread had rotated or even partially broken. Thermogravimetric analysis and differential scanning calorimetry measurements revealed that the thermal stability of MPPS/PTFE sewing thread was slightly decreased.

Keywords

MPPS/PTFE sewing thread numerous hairiness acid resistance corrosion mechanism

In recent years, the industries with high energy consumption and high pollution have been growing rapidly, such as thermal power plants, steel plants, metallurgical plants, cement plants, and chemical plants.^1–5 A large amount of toxic gas and liquid in the production process is released from the industry’s activities, which not only seriously damages the environment but also poses a great threat to people’s physical and mental safety.^6–11 To this end, the national control of the emission of industrial smoke was increasingly strengthened, and the standards became more stringent. According to relevant regulations, the concentration of dust emission at the outlet should be controlled under 30 mg/m³ or even 10 mg/m³.^12–14 All these factors have provided opportunities and impetus for the development of dust removal technology. For dust removal technology, solid or liquid particles in gas or liquid are trapped by the gas–solid or liquid–solid separation principle of two-phase flow. The commonly used dedusting devices are mechanical precipitator, cyclone precipitator, electrostatic precipitator, wet precipitator, filter precipitator, and bag precipitator. Among the above equipment using dust filters, bag filters are considered to be the best choice to filter the high-temperature dust gas at present due to high filtration efficiency,^15–17 simple, stable operation, and strong adaptability.^18–21

The main principle mechanism of the bag filter is to collect and filter the small dust particles through the filter. The coarse dust is trapped by filter materials mainly via the action of inertial impact, whereas fine dust is trapped via the action of diffusion and screening. The dust layer of filter materials also has a certain effect on filtering. When dust-containing gas passes through the dust collector, dust will be trapped on the outer surface of the filter bag, whereas the clean gas enters the inside of the filter bag through filter materials. The fabric used as a bag filter ensures the dust is collected according to the inherent physical filtration characteristics of the filter material, and the dust layer attaches to the surface of the filter material as the filter layer. The cage frame inside the filter bag is used to support the filter bag and to prevent the bag from collapsing. At the same time, it helps to clear and redistribute the dust cake. The filtration efficiency of the bag filter is related to many factors, such as filter materials, sewing threads, and pinholes in the surface of the filter bag.^18,22–26 However, the filtration efficiency mainly depends on the performance of the filter materials. Therefore, high-performance fibers^27–30 such as polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), poly-p-phenylenediamine, and polyimide are often used to prepare the filter materials.

Among these synthetic high-performance fibers, PTFE fiber has the best comprehensive performance, and is known as the king of plastic. Filter materials made of PTFE fibers have high properties, such as excellent mechanical properties, thermal stability, and excellent resistance to chemical corrosion.^31–33 In order to avoid the failure of filter bags due to the mismatch between sewing threads and filter materials, most factories have also used high-performance PTFE sewing threads to replace other types of sewing threads to filter high-temperature dusty gas. However, there is no guarantee that the service life of the filter bag is greatly increased by the use of PTFE fibers. Through the actual inspection, it can be found that PTFE sewing thread has a transverse cutting effect on the filter materials; this is because the surface of PTFE sewing thread is very smooth.³⁴ And the phenomenon of thermal creep of PTFE sewing thread has often occurred under the action of heat.^35–38

A modified PPS (MPPS) and PTFE sewing thread (referred to as MPPS/PTFE sewing thread) has been prepared to make up for the above defects of PTFE sewing thread. MPPS fiber is obtained via partial oxidation of PPS fiber, and this process improves its antioxidant performance. Acid resistance of a fiber is crucial if the filter is to be used for filtering high-temperature dusty gas. The acid resistance of MPPS/PTFE sewing thread is unknown. Therefore, the effects of acid solution on the properties of MPPS/PTFE sewing thread at different temperatures, different concentrations, and different times were studied in this paper to provide a reference basis for the application of MPPS/PTFE sewing thread in high-temperature dust removal.

Materials and methods

Materials

MPPS sewing thread, PTFE sewing thread, and MPPS/PTFE sewing thread were provided by Suzhou Naide New Material Technology Co. Ltd, and their linear densities were 65.17, 167.94, and 247.23 tex, respectively. The preparation process of MPPS/PTFE sewing thread includes two main steps, see Figure 1(a). Firstly, the technology of wrapping yarn and yarn combination was adopted; PTFE mono-filaments were used as the core wire and MPPS yarns were used as the substrates, and then a wrapping yarn was made. Secondly, the wrapping yarn was used as a thread, and the sewing thread was prepared after doubling the plied yarn. The surface of MPPS/PTFE sewing thread has a great degree of hairiness, see Figure 1(b). Properties of these sewing threads are shown in Figure 1(c) to (e) and Table 1. Sulfuric acid (H₂SO₄) was purchased from Sinopsin Group Chemical Reagent Co. Ltd with analytical grade and used without further purification.

Figure 1.

MPPS/PTFE sewing thread: (a) production process flow chart; (b) scanning electron microscopy image; (c) stress–strain curves; (d) initial modulus; (e) Fourier transform infrared spectroscopy curves.

Table 1.

Properties of experimental sewing threads

Index	Breaking force(cN)	Breaking strength(cN/tex)	Breaking extension(mm)	Elongation at break(%)	Work of rupture(cN·mm)	Breaking time(s)
MPPS/PTFE	4343.55	17.57	47.06	9.41	152986.05	11.29
PTFE	4165.25	24.80	27.08	5.42	73994.36	6.50
MPPS	1344.30	20.63	86.66	17.33	62864.75	10.40

Acid treatment

The experiment of H₂SO₄ solution on the durability of MPPS/PTFE sewing thread was conducted according to standard GB/T 35748-2017 “Teflon filament yarn”, with MPPS and PTFE sewing threads as the contrast samples. The treatment procedure for testing samples with H₂SO₄ solution comprised five steps. Firstly, the samples of MPPS/PTFE, PTFE, and MPPS sewing thread were prepared by balancing them for 24 h under standard temperature and humidity conditions. Secondly, the prepared samples from the first step were immersed in H₂SO₄ solution with a concentration of 2, 4, 6, 8, and 10 mol/L, respectively. Thirdly, the beakers containing the samples were placed into a thermostat water bath, which had reached the set temperature with a value of 25°C (or 85°C). After processing for 2, 4, 6, 8, 10, 24, 48, 72, 96, and 120 h, respectively, the beakers containing the samples were taken out. Fourthly, all samples were rinsed thoroughly with distilled water and then tested with pH test paper until neutral. Finally, all samples were dried and put into a standard temperature and humidity environment to balance for 24 h.

Experimental methods

Morphological structure

Morphological structures of MPPS, PTFE, and MPPS/PTFE sewing threads were analyzed by a scanning electron microscope (FlexSEM 1000, Hitachi, Japan). During the measurement, the samples were mounted on round stainless-steel holders by double-sided conductive adhesive tapes and coated with gold.

Tensile property

According to standard GB/T 3916-2013 “Determination of breaking strength and elongation at break of single yarn for textile winding (constant rate of extension method)”, tensile properties of MPPS/PTFE sewing thread were carried out by an electronic single yarn strength tester (YG061F, China), in which the gage length was 500 mm and the cross-head speed was 500 mm/min. The pre-tension was 0.5 cN/tex for conditioning samples.

Breaking strength retention rate (B) was used to characterize the loss of tensile properties of sewing thread before and after treatment with H₂SO₄ solution, which is the ratio of breaking strength of sewing thread after treatment with H₂SO₄ solution (P₁) and breaking strength of untreated sewing thread (P₂), and is shown in formula (1)

B = \frac{P_{1}}{P_{2}} \times 100 %

(1)

Corrosion mechanism

An attenuated total reflection Fourier transform infrared spectrometer (ATR-FTIR) (Nicolet 6700, Thermo Fisher, USA) and a thermal gravimetric analyzer (TG 209 F1 Libra, Netzsch, Germany) were used to characterize the corrosion mechanism of MPPS/PTFE sewing thread by H₂SO₄ solution.

Results and discussion

Surface damage

Figure 2 shows the surface topography of the sewing threads before treatment and after treatment with H₂SO₄ solution at a temperature of 25°C and a concentration of 2 mol/L for 120 h. There was no significant change on the surface of MPPS/PTFE sewing thread after treatment with H₂SO₄ solution. Besides, there was no sign of any damage on the surface of MPPS and PTFE fibers, which could be attributed to their good acid resistance.^39–41 However, it was noticed that some substances attached to the surface of MPPS fibers had been partially removed. So it could be concluded that the surface of MPPS/PTFE sewing thread was almost undamaged within 120 h in H₂SO₄ solution with a temperature of 25°C and a concentration of 2 mol/L.

Figure 2.

Surface morphology of (a1), (b1) and (c1) untreated sewing threads and (a2), (b2) and (c2) acid-treated sewing threads when the temperature was 25°C; (a1) and (a2) MPPS/PTFE sewing thread; (b1) and (b2) PTFE sewing thread; (c1) and (c2) MPPS sewing thread.

Figure 3 shows the effect of H₂SO₄ solution’s treatment time on the surface morphology of MPPS/PTFE sewing thread at a temperature of 85°C and a concentration of 2 mol/L. H₂SO₄ solution’s treatment time had a small effect on the surface morphology of MPPS/PTFE sewing thread under these conditions. This could be attributed to the fact that the surface of MPPS and PTFE fibers was almost undamaged with increasing the treatment time of H₂SO₄ solution. In this case, it could be concluded that the acid resistance of MPPS fibers was good, so the acid resistance of MPPS/PTFE sewing thread was also good.

Figure 3.

Effect of H₂SO₄ solution’s treatment time on the surface morphology of (a1), (a2) and (a3) MPPS/PTFE sewing thread with the time of 2, 4, and 6 h, respectively; (b1), (b2) and (b3) PTFE sewing thread with the time of 2, 4, and 6 h, respectively; (c1), (c2) and (c3) MPPS sewing thread with the time of 2, 4, and 6 h, respectively; when the temperature was 85°C.

Figure 4 shows the effect of H₂SO₄ solution’s concentration on the surface morphology of MPPS/PTFE sewing thread at a temperature of 85°C and a treatment time of 2 h. The surface of MPPS/PTFE sewing thread was almost unchanged when the concentration of H₂SO₄ solution did not exceed 6 mol/L. In comparison, the surface of MPPS fibers was slightly damaged when the concentration of H₂SO₄ solution was 10 mol/L. So it could be concluded that the addition of MPPS fibers did not have a great influence on the acid resistance of MPPS/PTFE sewing thread. It was evident that after the treatment of H₂SO₄ solution within 10 mol/L when the temperature was 85°C, and the treatment time was 2 h, the acid resistance of MPPS/PTFE sewing thread was good.

Figure 4.

Effect of H₂SO₄ solution’s concentration on the surface morphology of (a1), (a2) and (a3) MPPS/PTFE sewing thread with concentrations of 4, 6, and 10 mol/L, respectively; (b1), (b2) and (b3) PTFE sewing thread with concentrations of 4, 6, and 10 mol/L, respectively; (c1), (c2) and (c3) MPPS sewing thread with concentrations of 4, 6, and 10 mol/L, respectively; when the temperature was 85°C.

To sum up, MPPS/PTFE sewing thread had good acid resistance; this is due to PTFE fiber inside MPPS/PTFE sewing thread, which had good acid resistance. The macromolecular chain of PTFE fiber contained highly polar fluorine atoms, and it had high crystallinity. However, due to the existence of MPPS fiber, its acid resistance decreased slightly. In this case, a small amount of damage appeared on the surface of MPPS fiber inside MPPS/PTFE sewing thread.

Effect of acid treatment on tensile properties of MPPS/PTFE sewing thread

Figure 5 shows the mechanical properties of MPPS/PTFE, PTFE, and MPPS sewing threads after treatment with H₂SO₄ solution at a temperature of 25°C and a concentration of 2 mol/L for 24, 48, 72, 96, and 120 h. The mechanical properties of MPPS/PTFE sewing thread were worse than that of PTFE and MPPS sewing thread. For MPPS/PTFE, PTFE, and MPPS sewing threads, the maximum strength loss was around 9.1%, 0%, and 1.6%, respectively, whereas the maximum deviation of elongation at break was about 4.6%, 1.6%, and 0.2%, respectively. By comparison, it could be found that the surface of MPPS fibers was slightly damaged. In contrast, the surface of PTFE fibers was not damaged under the same treatment conditions, which made the mechanical properties of MPPS/PTFE sewing thread to be slightly decreased.

Figure 5.

Effect of H₂SO₄ solution’s treatment time on mechanical properties of MPPS/PTFE sewing thread when the temperature was 25°C and the concentration was 2 mol/L.

Figure 6 shows the mechanical properties of MPPS/PTFE, PTFE, and MPPS sewing threads after treatment with H₂SO₄ solution at a temperature of 85°C and a concentration of 2 mol/L for 2, 4, 6, 8, and 10 h, respectively. The mechanical properties of MPPS/PTFE sewing thread were similar to that of PTFE sewing thread, which were both better than that of MPPS sewing thread after treatment with H₂SO₄ solution for 10 h. For MPPS/PTFE, PTFE, and MPPS sewing threads, the maximum strength loss was around 5.5%, 5.2%, and 12.1%, respectively, and the maximum deviation of elongation at break was about 4.6%, 1.3%, and 1.6%, respectively. From the above analysis, it could be concluded that the MPPS fibers in MPPS/PTFE and MPPS sewing threads were slightly damaged after treatment with H₂SO₄ solution for 10 h when the temperature was 85°C and the concentration was 2 mol/L.

Figure 6.

Effect of H₂SO₄ solution’s treatment time on mechanical properties of MPPS/PTFE sewing thread when the temperature was 85°C and the concentration was 2 mol/L.

The comparison between Figures 5 and 6 shows that the acid resistance of MPPS/PTFE sewing thread was better than that of MPPS sewing thread. PTFE sewing thread showed the best acid resistance, whether it was treated with acid for a short time or for a long time. Therefore, the addition of MPPS fibers deteriorated the acid resistance of MPPS/PTFE sewing thread.

Figure 7 shows the mechanical properties of MPPS/PTFE, PTFE, and MPPS sewing threads after treatment with H₂SO₄ solution at a temperature of 85°C and concentrations of 2, 4, 6, 8, and 10 mol/L for 2 h. The concentration of H₂SO₄ solution had little influence on the mechanical properties of MPPS/PTFE sewing thread. However, when the concentration of the acid solution did not exceed 10 mol/L, MPPS/PTFE sewing thread showed better mechanical properties than that of MPPS sewing thread but still worse than PTFE sewing thread. For MPPS/PTFE, PTFE, and MPPS sewing threads, the maximum strength loss was around 2.8%, 0.8%, and 6.4%, respectively, and the maximum deviation of elongation at break was about 4.6%, 1.3%, and 1.2%, respectively.

Figure 7.

Effect of H₂SO₄ solution’s concentration on mechanical properties of MPPS/PTFE sewing thread when the temperature was 85°C and the time was 2 h.

The comparison between Figures 6 and 7 shows that the damage from acid treatment time to MPPS/PTFE sewing thread was greater than the damage from acid solution concentration when the temperature was 85°C. It was observed that the addition of MPPS fibers deteriorated the acid resistance of MPPS/PTFE sewing thread.

The mechanical properties of MPPS/PTFE sewing thread were decreased because the auxiliaries on the MPPS fiber surface had been partially removed after treatment with H₂SO₄ solution, which made the surface of MPPS fibers appear to have more defects. Besides, the protective effect of the surface auxiliaries on MPPS fibers disappeared. At the same time, there were a large number of carbon–sulfur bonds in the macromolecular chain of MPPS fiber, and the carbon–sulfur bond may partially have broken under the action of H₂SO₄ solution, which led to the decrease of its fracture strength. The specific reasons will be discussed below, combined with the infrared spectrum and thermal performance analysis results.

Corrosion mechanism of H₂SO₄ solution on MPPS/PTFE sewing thread

Infrared spectra of acid-treated MPPS/PTFE sewing thread

Figure 8 shows the infrared spectrum of MPPS/PTFE sewing thread after treatment with H₂SO₄ solution at a temperature of 25°C and a concentration of 2 mol/L for 120 h. It was observed that the stretching vibration peaks of the benzene ring skeleton of MPPS/PTFE sewing thread had almost unchanged,^42–44 where the bands were at 3086, 1470, and 1386 cm^−l. It can be concluded that after treatment with H₂SO₄ solution at a temperature of 25°C and a concentration of 2 mol/L for 120 h, the main structure of MPPS/PTFE sewing thread was not damaged.

Figure 8.

Fourier transform infrared spectroscopy spectrum of (a) MPPS/PTFE sewing thread before and after treatment with H₂SO₄ solution when the temperature was 25°C; (b), (c) and (d) show the locally enlarged view.

However, the peak at 1636 cm^−l was increased and shifted to 1640 cm^−l. In the meantime, the peak at 1567 cm⁻¹ was decreased and shifted to 1571 cm^−l (Figure 8(b)). Besides, it was noticed that the peak at 1089 cm⁻¹ was split into two little peaks, which caused the new peaks at 1103 and 1068 cm⁻¹ to appear, whereas the intensity and area of the characteristic peak at 1005 cm^−l was increased (Figure 8(c)). As shown in Figure 8(d), the peaks at 805, 633, and 552 cm^−l were almost unchanged. These above phenomena indicate that the benzene ring was not damaged by acid treatment, but the carbon–sulfur bonds at the benzene ring may have rotated or even partially broken because the peak at 1089 cm⁻¹ belonged to the vibration of the carbon–sulfur bonds.⁴²

Figure 9 shows the infrared spectrum of MPPS/PTFE sewing thread after treatment with H₂SO₄ solution at a temperature of 85°C. It was observed that the stretching vibration peaks of the benzene ring skeleton of MPPS/PTFE sewing thread^42–44 had almost unchanged, which were the bands at 3086, 1470, and 1386 cm^−l (Figure 9(a) and (b)). So it could be concluded that the main structure of MPPS/PTFE sewing thread was not damaged after treatment with H₂SO₄ solution at a temperature of 85°C. This could also be derived from the results of the mechanical properties of MPPS/PTFE sewing thread.

Figure 9.

Fourier transform infrared spectroscopy spectrum of (a) MPPS/PTFE sewing thread before and after treatment with H₂SO₄ solution when the temperature was 85°C; (b), (c) and (d) show the locally enlarged view.

However, the peak at 1259 cm⁻¹ disappeared after treatment with H₂SO₄ solution at a temperature of 85°C and a concentration of 10 mol/L for 2 h, whereas it was unchanged when the concentration of H₂SO₄ solution was 2 mol/L. This change of 1259 cm⁻¹ caused the height and intensity of the peak at 1202 cm⁻¹ to be decreased. Moreover, the intensity and area of the characteristic peak at 1005 cm^−l was increased (Figure 9(c)), whereas the peaks at 805, 633, and 552 cm^−l were almost unchanged (Figure 9(d)). This is attributed to the fact that the peak at 1259 cm⁻¹ belonged to an auxiliary agent on the surface of MPPS/PTFE sewing thread^45,46 and the peak at 1089 cm⁻¹ belonged to the vibration of the carbon–sulfur bonds. In this case, it could be concluded that the auxiliary agent on the surface of MPPS/PTFE sewing thread was removed after treatment with H₂SO₄ solution, and the carbon–sulfur bonds at the benzene ring of MPPS fibers in the MPPS/PTFE sewing thread may have rotated or even partially broken.

Thermal properties of acid-treated MPPS/PTFE sewing thread

Figure 10 shows the thermogravimetry and derivative thermogravimetry curves of MPPS/PTFE sewing thread after treatment with H₂SO₄ solution.^42,47 It was observed that the decomposition temperature was decreased to 12.7°C and the residual carbon rate was decreased 1.2% after treatment with H₂SO₄ solution at a temperature of 25°C and a concentration of 2 mol/L for 120 h, whereas the decomposition temperature was decreased to 11.5°C and the residual carbon rate was decreased 2.5% after treatment with H₂SO₄ solution at a temperature of 85°C and a concentration of 10 mol/L for 2 h (Figure 10(a)). From the derivative thermogravimetry curves of MPPS/PTFE sewing thread, it was found that the temperature corresponding to the maximum decomposition rate was almost unchanged, whereas the maximum decomposition rate was slightly increased (Figure 10(b)). By comparison, it could be noticed that the thermal stability of MPPS/PTFE sewing thread was decreased after treatment with H₂SO₄ solution from the above analysis.

Figure 10.

Thermogravimetry curves of MPPS/PTFE sewing thread before and after treatment with H₂SO₄ solution.

Differential scanning calorimetry curves of MPPS/PTFE sewing thread after treatment with H₂SO₄ solution are shown in Figure 11. It was observed that the melting temperatures were almost unchanged, whereas the crystallization temperature of MPPS fibers was about 2°C higher than that of untreated MPPS/PTFE sewing thread after treatment with H₂SO₄ solution at a temperature of 25°C and a concentration of 2 mol/L for 120 h. In the meantime, it was noticed that the melting temperatures were little changed, whereas the crystallization temperature of MPPS fibers was about 9°C higher than that of untreated MPPS/PTFE sewing thread after treatment with H₂SO₄ solution at a temperature of 85°C and a concentration of 10 mol/L for 2 h. By comparison, it could be found that the thermal stability of MPPS/PTFE sewing thread was decreased after treatment with H₂SO₄ solution.

Figure 11.

Differential scanning calorimetry curve of MPPS/PTFE sewing thread before and after treatment with H₂SO₄ solution: (a) absorption of heat; (b) heat release.

Conclusions

In this work, the effect of the addition of MPPS fibers on the acid resistance of MPPS/PTFE sewing thread was deeply studied to provide a reference basis for applying MPPS/PTFE sewing thread in high-temperature dust removal. It was observed, after treatment with H₂SO₄ solution, that there were no significant changes on the surface of MPPS/PTFE sewing thread, but some substances attached to the surface of MPPS fibers had been partially removed. Meanwhile, the surface of MPPS fibers was slightly damaged, which indicated that the addition of MPPS fibers had a small influence on the acid resistance of MPPS/PTFE sewing thread when the concentration of H₂SO₄ solution did not exceed 10 mol/L. Furthermore, the tensile properties of MPPS/PTFE sewing thread still meet the requirements of filtration. The maximum strength loss and the maximum deviation of elongation at break of MPPS/PTFE sewing thread were around 9.1% and 4.6%, respectively. Fourier transform infrared spectroscopy analysis showed that the macromolecular chains of MPPS fibers in the MPPS/PTFE sewing thread had rotated or partially fractured. Moreover, the thermal stability of MPPS/PTFE sewing thread was slightly decreased after treatment with H₂SO₄ solution, which was caused by the damage of MPPS fibers.

Footnotes

Acknowledgements

The authors thank Suzhou Naide New Material Technology Co. Ltd for providing the materials.

Declaration of conflicting interests

The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Funding

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University (No. CUSF-DH-D-2020006).

ORCID iDs

Huang Wanzhen

Zhang Bin

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Influence of sulfuric acid solution on the durability of high-performance modified polyphenylene sulfide and polytetrafluoroethylene sewing thread for high-temperature filtration

Abstract

Keywords

Materials and methods

Materials

Acid treatment

Experimental methods

Morphological structure

Tensile property

Corrosion mechanism

Results and discussion

Surface damage

Effect of acid treatment on tensile properties of MPPS/PTFE sewing thread

Corrosion mechanism of H2SO4 solution on MPPS/PTFE sewing thread

Infrared spectra of acid-treated MPPS/PTFE sewing thread

Thermal properties of acid-treated MPPS/PTFE sewing thread

Conclusions

Footnotes

Acknowledgements

Declaration of conflicting interests

Funding

ORCID iDs

References

Corrosion mechanism of H₂SO₄ solution on MPPS/PTFE sewing thread