Study of mechanical and physical properties of LLDPE-G-MA injection grade reinforced with coffee husk post-industrial waste

Abstract

In this work, the evaluation of a post-industrial residue of coffee industry (coffee husk) as organic filler in functionalised linear low-density polyethylene matrix was investigated. The properties of these composites were compared with more widely used inorganic fillers, such as calcium carbonate and SiO₂. All the composites were prepared by grafting of linear low-density polyethylene maleic anhydride and then by melt mixing of fillers. The rheological behaviour of the compounds during processing was established to evaluate the effects of a nanosized (SiO₂), micron sized calcium carbonate and coffee husk fillers. Additionally, thermal, morphological and mechanical properties of the polymer composites were evaluated. The results indicated an increase in tensile modulus and tensile strength resulting from incorporation of fillers in the polymer matrix. Some relevant modifications of melting temperature and crystallinity degree for coffee husk composites were observed, but not observed for inorganic fillers composites. The properties of the composites prepared with coffee husk were comparable to those obtained with inorganic fillers, demonstrating that this coffee residue can be used as filler for obtaining composites for many possible applications.

Keywords

LLDPE-g-MA coffee husk composites

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References

Paul

Robeson

. Polymer nanotechnology: nanocomposites. Polym J 2008; 49: 3187–3204.

Chan

. Polypropylene/calcium carbonate nanocomposites. Polym J 2002; 43: 2981–2892.

Nwabunma

Overview of polyolefin composites. In: Nwabunm

(ed). Polyolefin composites, Hoboken, NJ: John Wiley & Sons, Inc., 2007, pp. 1–28.

Galli

Vecellio

. Technology: driving force behind innovation and growth of polyolefins. Prog Polym Sci 2001; 26: 1287–1336.

Dougnac

Alamillo

Peoples

. Effect of particle diameter on the permeability of polypropylene/SiO₂ nanocomposites. Polym J 2010; 51: 2918–2926.

González

Albano

Ichazo

. Effects of coupling agents on mechanical and morphological behavior of the PP/HDPE blend with two different CaCO₃. Eur Polym J 2002; 38: 2465–2475.

Sahebian

Zebarjad

Khaki

. The effect of nano-sized calcium carbonate on thermodynamic parameters of HDPE. J Mater Process Technol 2009; 209: 1310–1317.

Gao

Liu

Zhang

. Mechanical performance of nano-CaCO₃ filled polystyrene composites. Acta Mech Solida Sin 2009; 22: 555–562.

Avolio

Gentile

Avella

. Polymer–filler interactions in PET/CaCO₃ nanocomposites: chain ordering at the interface and physical properties. Eur Polym J 2013; 49: 419–427.

10.

Bailly

Kontopoulou

El Mabrouk

. Effect of polymer/filler interactions on the structure and rheological properties of ethylene-octene copolymer/nanosilica composites. Polym J 2010; 51: 5506–5515.

11.

Goulart

SAS

Oliveira

Teixeira

. Mechanical behaviour of polypropylene reinforced palm fibers composites. Procedia Eng 2011; 10: 2034–2039.

12.

Sobczak

Lang

Haider

. Polypropylene composites with natural fibers and wood – general mechanical property profiles. Compos Sci Technol 2012; 72: 550–557.

13.

Awal

Cescutti

Ghosh

. Interfacial studies of natural fibre/polypropylene composites using single fibre fragmentation test (SFFT). Compos Part A Appl Sci Manuf 2011; 42: 50–56.

14.

Posada JC, Jaramillo LY, Cadena EM, et al. Bio-based composites from agricultural wastes: polylactic acid and bamboo Guadua angustifolia. J Compos Mater, http://jcm.sagepub.com/cgi/doi/10.1177/0021998315616274 (2015, accessed 31 March 2016).

15.

Rosales

Perera

Matos

. Nanoarcillas y su aplicación en polímeros. Supl Rev Latinoam Metal y Mater 2009; 2: 27–28.

16.

Rosales

Perera

Matos

. Influencia de morfologia sobre las propiedades mecánicas de nanocompuestos y mezclas de polímeros. Rev Latinoam Metal y Mater 2006; 26: 3–19.

17.

Semsarzadehl

Mehrabzadeh

Salehi

. New aspects of the reaction of HDPE with maleic anhydride. Iran Polym J 1999; 8: 271–278.

18.

ASTM D3182. Standard practice for rubber–materials, equipment, and procedures for mixing standard compounds and preparing standard vulcanized, 2013.

19.

Ghaemy

Roohina

. Grafting of maleic anhydride on polyethylene in a homogeneous medium in the presence of radical initiators. Iran Polym J 2003; 12: 21–29.

20.

Gaylord

Mehta

. Degradation and cross-linking of ethylene-propylene copolymer rubber on reaction with maleic anhydride and/or peroxides. J Appl Polym Sci 1987; 33: 2549–2558.

21.

ASTM D638. Standard test method for tensile properties of plastics, 2004.

22.

ASTM D4318-08. Standard test method for transition temperatures and enthalpies of fusion and crystallization of polymers by differential scanning, 2012.

23.

Dorigato

Pegoretti

. Fracture behaviour of linear low density polyethylene – fumed silica nanocomposites. Eng Fract Mech 2012; 79: 213–224.

24.

Osswald

Menge

Flórez

. Ciencia de polímeros para ingenieros, 1st ed. Cúcuta: Ed Guaduales, 2010, pp. 340–340.

25.

Guzmán

Murillo

. Funcionalización de polietileno de baja densidad con anhídrido maleico en estado fundido. Polimeros 2014; 24: 162–169.

26.

Zhang

Chen

. Functionalization of polyolefins with maleic anhydride in melt state through ultrasonic initiation. Polym J 2006; 47: 4750–4759.

27.

Oswald

. Procesado de polímeros fundamentos, 1st ed. Wisconsin, USA: Guaduales, 2003.

28.

Mullin JW, Ulrich J, Stelzer T, et al. Crystallization. Kirk-Othmer Encycl Chem Technol pp.1–63, http://doi.wiley.com/10.1002/0471238961.0318251918152119.a01.pub3 (2011, accessed 30 March 2016).

29.

Ewa Piorkowska GCR. Handbook of polymer crystallization,498 p., http://books.google.com/books?id=-jgptE6ClKkC&pgis=1 (2013, accessed 31 March 2016).

30.

Laoutid

Estrada

Michell

. The influence of nanosilica on the nucleation, crystallization and tensile properties of PP-PC and PP-PA blends. Polym (United Kingdom) 2013; 54: 3982–3993.