Effect of Mixing Sequences on the Flexural and Morphological Properties of Epoxy/ Organo-Montmorillonite Nanocomposites

Abstract

The epoxy nanocomposites were prepared by addition of Organo-montmorillonite (OMMT) varied from 0 to 10 wt%. In-situ polymerization method was used to prepare epoxy/OMMT nanocomposites by three different mixing sequence methods. Method 1 was performed by mixing OMMT with cycloaliphatic amine (curing agent) first, followed by addition of diglycidyl ether-bisphenol A (DGEBA). Method 2 was carried out by mixing the DGEBA with OMMT first, followed by addition of curing agent. In method 3, the DGEBA and curing agent were mixed first, followed by the addition of OMMT. The objective of the research is to study the effects of mixing sequences on the flexural properties and morphology of epoxy/OMMT nanocomposites. The flexural and morphological properties of epoxy/ OMMT nanocomposites were studied by flexural tests, Field Emission Scanning Electron Microscopy, and X-ray Diffraction (XRD). The flexural modulus of epoxy was improved significantly by the incorporation of OMMT. This is attributed to the reinforcement and exfoliation/intercalation of the OMMT. The flexural modulus and strength of epoxy/OMMT nanocomposites prepared by method 3 was relatively higher than that of the composites prepared by method 1 and 2. The XRD results showed the formation of exfoliated structure in the epoxy/OMMT nanocomposites. Sequence of mixing influenced the dispersion and intercalation/exfoliation of the OMMT in the epoxy matrix. Appropriate mixing sequence should be selected in order to achieve better exfoliation of OMMT and higher flexural modulus and strength of the epoxy nanaocomposites.

Keywords

thermosetting resins epoxy organo-montmorillonite flexural morphology mixing sequences.

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References

Kota, M. and Usuki, A. ( 2000). Epoxy-clay Nanocomposites, In: Pinnavaia, T.J. and Beall, G.W. (eds), Polymer Clay Nanocomposites, pp. 97-109, John Wiley & Sons, New York.

Samandari, S.S. , Khatibi, A.A. and Basic, D. (2007). An Experimental Study on Clay/epoxy Nanocomposites Produced in a Centrifuge , Composites Part B: Engineering, 38: 102-107.

Koo, J.H. ( 2006). Polymer Nanocomposites, Processing, Characterization, and Applications, McGraw-Hill, New York.

Kelly, A. ( 2000). Polymer Matrix Composites, In: Terjeja, R. and Manson, J.E. (eds), Comprehensive Composite Materials, Vol. 2, pp. 3-18, Elsevier Science Ltd, UK.

Isik, I. , Yilmazer, U. and Bayram, G. ( 2003). Impact Modified Epoxy/Montmorillonite Nanocomposite: Synthesis and Characterization, Polymer, 44: 6371-6377.

Ho, M.W. , Lam, C.K. , Lau , K. , Ng , D.H.L. and Hui , D. (2006). Mechanical Properties of Epoxy-based Composites using Nanoclays, Composite Structures, 75: 415-421.

Kornmann, X. , Lindberg, H. and Berglund, L.A. (2001). Synthesis of Epoxy-clay Nanocomposites Influence of the Nature of the Curing Agent and Structure, Polymer, 42: 4493-4499.

Becker, O. , Varley, R. and Simon, G. ( 2002). Morphology, Thermal Relaxations and Mechanical Properties of Layered Silicate Nanocomposites Based upon High-functionality Epoxy Resins , Polymer, 43: 4365-4373.

Luo, J.J. and Daniel, I.M. (2003). Characterization and Modeling of Mechanical Behavior of Polymer/Clay Nanocomposites, Composites Science and Technology, 63: 1607-1616.

10.

Chen, D. and He, P. ( 2004). Monitoring the Curing Process of Epoxy Resin Nanocomposites Based on Organo-montmorillonite - A New Application of Resin Curemeter, Composites Science and Technology, 64: 2501-2507.

11.

Camino, G. , Tartaglione, G. , Frache, A. , Manferti, C. and Costa, G. ( 2005). Thermal and Combustion Behaviour of Layered Silicate-Epoxy Nanocomposites, Polymer Degradation and Stability, 90: 354-362.

12.

Wang, B. , Qi, N. , Gong, W. , Li, X.W. and Zhen, Y.P. ( 2006). Study on the Microstructure and Mechanical Properties for Epoxy Resin/Montmorillonite Nanocomposites by Positron, Radiation Physics and Chemistry, 76: 106-111.

13.

Yasmin, A. , Luo, J.J. , Abot, J.L. and Daniel, I.M. ( 2006). Mechanical and Thermal Behavior of Clay/Epoxy Nanocomposites , Composites Science and Technology, 66: 2415-2422.

14.

Yasmin, A. , Abot, J.L. and Daniel, I.M. ( 2003). Processing of Clay/Epoxy Nanocomposites by Shear Mixing , Scripta Material, 49: 81-86.

15.

Akbari, D. and Bagheri, R. ( 2007). Deformation Mechanism of Epoxy/Clay Nanocomposites , European Polymer Journal, 43: 782-788.

16.

Jordan, J. , Jacob, K.I. , Tannenbaum, R. , Sharaf, M.A. and Jasiuk, I. ( 2005). Experimental Trends in Polymer Nanocomposites - A Review , Materials Science and Engineering, A393: 1-11.

17.

Hackaman, I. and Hollaway, L. ( 2006). Epoxy-layered Silicate Nanocomposites in Civil Engineering , Composites Part A: Applied Science and Manufacturing, 37: 1161-1170.

18.

Park, S.J. , Seo, D.I. and Lee, J.R. ( 2002). Surface Modification of Montmorillonite on Surface Acid-Base Characteristics of Clay and Thermal Stability of Epoxy/Clay Nanocomposites , Journal of Colloid and Interface Science, 251: 160-165.

19.

Kormmann, X. ( 2001). Synthesis and Characterization of Thermoset-Layered Silicate Nanocomposite, pp. 1-44, Luea Tekniska Unversitet, Sweden.

20.

Wetzel, B. , Rosso, P. , Haupert, F. and Friedrich, K. ( 2006). Epoxy Nanocomposites - Fracture and Toughening Mechanisms , Engineering Fracture Meachanics, 73: 2375-2398.

21.

Wang, L. , Wang, K. , Chen, L. , Zhang, Y.W. and He, C.B. ( 2006). Preparation, Morphology and Thermal/mechanical Properties of Epoxy/nanoclay Composite, Composites Part A: Applied Science and Manufacturing, 37: 1890-1896.

22.

Dean, D. , Walker, R. , Theodore, M. , Hampton, E. and Nyairo, E. ( 2005). Chemorhelogy and Properties of Epoxy/layered Silicate Nanocomposites, Polymer, 46: 3014-3021.

23.

Liu, W.P. , Hao, S.V. and Pugh, M. (2005). Organoclay-modified High Performance Epoxy Nanocomposites, Composites Science and Technology , 65: 307-316.

24.

Okamoto, M. ( 2005). Biodegradable Polymer/Layered Silicate Nanocomposites: A Review, In: Mallapragada, S. and Narasimhan, B. (eds), Handbook of Biodegradable Polymeric Materials and Their Applications, Chapter 8, pp. 1-45, American Scientific Publishers, USA.

25.

Kornmann, X. , Rees, M. , Thomann , Y. , Necola, A. , Barbezat, M. and Thomann, R. (2005). Epoxy-layered Silicate Nanocomposites as Matrix in Glass Fiber-reinforced Composites, Composites Science and Technology, 65: 2259-2268.

26.

Chen, C. , Khobaib, M. and Curliss, D. ( 2003). Epoxy Layered-silicate Nanocomposites, Progress in Organic Coatings, 47: 376-383.