Interfacial crystalline behavior in glass-fiber/polypropylene composites modified by block copolymer coupling agents
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A kind of di-block copolymer polystyrene-block-poly(γ-methacryloxy-propyltrimethoxysilane) (PS-b-PMPS) with different PS block length and a kind of tri-block copolymer polystyrene-block-poly(n-butylacrylate)-block-poly(γ-methacryloxypropyltrimethoxysilane) (PS-b-PnBA-b-PMPS) with different PnBA block length were synthesized by atom transfer radical polymerization (ATRP), in which PS was a ‘hard’ block and PnBA was a ‘soft’ block. The interfacial crystallization behaviors of glass fiber/polypropylene systems modified with different coupling agents MPS, PS-b-PMPS, and PS-b-PnBA-b-PMPS were investigated on different crystallization conditions. Transcrystallinity could not be induced on non-isothermal crystallization or without maleic anhydride (10%) in polypropylene, but it appeared when glass fibers were treated with common silane coupling agent γ-methacryloxypropyltrimethoxysilane (MPS) and di-block copolymer coupling agent PS-b-PMPS in 135 °C isothermal crystallization without shear and 150 °C isothermal crystallization with shear. However, it disappeared at the interface when the samples were treated with tri-block copolymer coupling agent (PS-b-PnBA-b-PMPS) either under static or shear-induced condition. It might be that the flexible interlayer formed by the flexible block PnBA of PS-b-PnBA-b-PMPS could relax not only the thermal stress resulted from interface temperature gradient arising from sample cooling for crystallization, but also the shear stress induced by fiber/matrix interface shear.
KeywordsGlass Fiber Atom Transfer Radical Polymerization Atom Transfer Radical Polymerization Maleic Anhydride Isothermal Crystallization
The authors sincerely acknowledge the support of NSFC (50003003).
- 2.Sako N, Matsuoka T, Sakaguchi K (1998) In: Proceedings of the international conference on fiber reinforced composites, 7th, Newcastle upon Tyne, April 15–17, p 175Google Scholar
- 11.Wang H (1996) Master’s degree thesis of East China University of Science and Technology p 15 (in Chinese)Google Scholar
- 12.Yang W, Gance D (1998) J East China Univ Sci Technol 24:675 (in Chinese)Google Scholar
- 17.Huson MG, McGill WJ (1985) J Polym Sci: Poly Phys Ed 23:121Google Scholar
- 18.Zeng H, Zhang Z (1992) J Mater Eng 1:6 (in Chinese)Google Scholar
- 19.Lin Z, Zeng H (2004) Chinese Polym Bull 5:56 (in Chinese)Google Scholar
- 27.Cui X, Zhou X, Dai G (2002) Polym Mater Sci Eng 18:138 (in Chinese)Google Scholar
- 31.Constable RC, Amur AM (1991) In: Proceedings of ANTEC, p 1892Google Scholar
- 32.Chatterjee AM, Price FP, Newman S (1975) J Polym Sci: Polym Phys 13:2391Google Scholar