Polypropylene layered silicate

Tang, Y., Hu, Y., Wang, Y.S., Gui, Z., Chen Z., and Fan, W. 2003. Intumescent flame retardant-montmorillonite synergism in polypropylene-layered silicate nanocomposites. Polym. Inter. 52 1396-1400. 

Zanetti, M. Camino, G. Canavese, D. Morgan, A.B. Lamelas, F.J. Wilkie, C.A. Fire retardant halogen-antimony-clay synergism in polypropylene layered silicate nanocomposites. Chem. Mater. 2002, 14, 189-193. 

Lee, S. H., and Youn, J. R., Properties of polypropylene/layered-silicate nanocomposites and melt-spun fibers, J. Appl. Polym. Sci, 109, 1221-1231 (2008). 

Gregoriou, V. G.,Kandilioti, G., and Bellas, S. T. Chain conformational transformations in syndiotactic polypropylene/layered silicate nanocomposites during mechanical elongation and thermal treatment. Polymer, 46, 11340-11350 (2005). 

Mittal, V. 2007. Polypropylene-layered silicate nanocomposites Filler matrix interactions and mechanical properties. Journal of Thermoplastic Composite Materials 20 575-599. 

Parija, S., Nayak, S. K., Verma, S. K., and Tripathy, S. S. 2004. Studies on physico-mechanical properties and thermal characteristics of polypropylene/layered silicate nanocomposites. Polymer Composites 25 646-652. 

Augier, S., Coiai, S., Pratelli, D., Conzatti, L., and Passaglia, E. 2009. New functionalized polypropylenes as controlled architecture compatibilizers for polypropylene layered silicates nanocomposites. Journal of Nanoscience and Nanotechnology 9 4858-4869. 

Chrissopoulou, K., Altintzi, L, Andrianaki, L, Shemesh, R., Retsos, H., Giarmelis, E. R, and Anastasiadis, S. H. 2008. Understanding and controlling the structure of polypropylene/ layered silicate nanocomposites. Journal of Applied Polymer Science 46 2683-2695. 

Dubnikova, I. L., Berezina, S. M., Korolev, Y. M., Kim, G. M., and Lomakin, S. M. 2007. Morphology, deformation behavior and thermomechanical properties of polypropylene/maleic anhydride grafted polypropylene/layered silicate nanocomposites. 

L. Cauvin, D. Kondo, M. Brieu, N. Bhatnagar, Mechanical properties of polypropylene layered silicate nanocomposites characterization and micro-macro modelling. Polymer Testing 29 (2) (2010) 245-250. 

Mittal V (2007) Polypropylene-layered silicate nanocomposites filler matrix interactionsand mechanical properties. J Thermoplast Compos Mater 20 575-599 Moore DM, Reynolds RC (1997) X-ray diffraction and the identification and analysis of Najafi A, Kord B, Abdi A, Ranaee S (2011) The impact of the nature of nanoclay on physical and mechanical properties of polypropylene/reed flour nanocomposites. J Thermoplast Compos Okada A, Usuki A (2006) Twenty years of polymer composites. Macromol Mater Eng 291 1449-1476... 

Kojima Y, Usuki A, Kawasumi M, Okada A, Kurauchi T, Kamigaito O, Kaji K (1994) Fine structure of nylon-6-clay hybrid. J Polym Sci B Polym Phys 32 625-630 Koo CM, Kim JH, Wang KH, Chung IJ (2005) Melt-extensional properties and orientation behaviors of polypropylene-layered silicate nanocomposites. J Polym Sci B Polym Phys 43 158-167... 

Koo CM, Kim MJ, Choi MH, Kim SO, Chung IJ (2003) Mechanical and rheological properties of the maleated polypropylene-layered silicate nanocomposites with different morphology. J ApplPolym Sci 88(6) 1526-1535... 

Lee, S.H., Cho, E.R., and Yorm, J.R. (2007) Rheological behavior of polypropylene/layered silicate nanocomposites prepared by melt compounding in shear and elongational flows. Journal of Applied Polymer Science, 103, 3506-3515. 

Abdul Rasheed, A.S., Preschilla, N., Sivalingam, G., Tyagi, S., Biswas, A., and BeHare, J.R. (2009) SAXS analysis of polypropylene-layered silicate nanocomposites an integrated correlations functions approach using an exfoliation factor. Journal of Nanoscience and Nanotedmology, 9, 4948-4960. 

Even after organic modification of the clays, polypropylene does not wet the surface of clays because it is nonpolar. It is necessary to blend in a functionalized polymer such as maleated polypropylene (PP-g-MA) that wets the modified clay surface more readily and is also miscible with the bulk polymer. Okada and coworkers were the first to produce polypropylene layered silicate nanocomposites by melt compounding the modified elay with PP-g-MA and PP. The progress made since then in preparing and characterizing polypropylene layered silicate nanocomposites is reviewed in this chapter. We discuss advances in formulations, preparation methods and characterization then proceed to effects of the dispersion state (intercalated vs. exfoliated) and of silicate loading on crystallinity, mechanical performance and other properties, and end with a summary of progress to date with these composites. All the results presented in this chapter refer to isotactic polypropylene nanocomposites with layered or smectite clays. 

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