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首页> 外文期刊>Journal of Applied Polymer Science >Modification of Recycled Polycarbonate with Core-Shell Structured Latexes for Enhancement of Impact Resistance and Flame Retardancy
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Modification of Recycled Polycarbonate with Core-Shell Structured Latexes for Enhancement of Impact Resistance and Flame Retardancy

机译：核壳结构胶乳对再生聚碳酸酯的改性，以提高抗冲击性和阻燃性

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摘要

Two types of core-shell structured latexes, poly(methyl methacrylate-co-butadiene-co-styrene) (MBS) and poly(methyl methacrylate-co-methylphenyl siloxane-co-styrene) (MSiS) were used to modify recycled polycarbonate (PC) for the enhancement of toughness and flame retardancy. The impact strength of the modified PC blends was not improved after melt-blending recycled PC with these two kinds of latexes, probably because the latex particles were not evenly dispersed in the PC matrix because of the incompatibility between PC and PMMA shell of the latexes. Addition of a compatibilizer, e.g. diglycidyl ether of bisphenol-A or poly(styrene-co-maleic anhydrude), can effectively enhance the toughening effect of recycled PC with core-shell structured modifiers. The presence of compatibilizer in the blends reduces the interfacial tension and introduces a steric hindrance to coalescence, and thus enhances the interfacial adhesion between PC domain and PMMA shell, and improves the dispersion of core-shell structured particles in the PC matrix. The ternary blends achieve a high impact resistance by cavitation of the particles, which relieves the triaxial stress and promotes massive shear yielding of the matrix, and then enables the matrix to fracture by the plane stress ductile tearing mode. Additionally, MSiS has a silicone-based core and can effectively retard the combustion of recycled PC. The blends containing 7 wt % MSiS and 3 wt % compatibilizer can achieve a UL94 V-0 rating in vertical burning test. We proposed that, during combustion, a fine dispersion of MSiS particles in the PC matrix facilitates the rapid migration of MSiS and formation of a uniform and highly flame resistant char barrier on the surface of the modified PC.
机译：两种类型的核-壳结构胶乳，聚甲基丙烯酸甲酯-共-丁二烯-苯乙烯共聚物（MBS）和聚甲基丙烯酸甲酯-共-甲基苯基硅氧烷-苯乙烯共聚物（MSiS）用于改性回收的聚碳酸酯（ PC），以增强韧性和阻燃性。在将这两种乳胶熔融共混回收的PC后，改性PC共混物的冲击强度没有提高，这可能是由于PC和PMMA壳之间的不相容性导致乳胶颗粒未均匀分散在PC基质中。添加增容剂，例如双酚A的二缩水甘油醚或聚（苯乙烯-顺丁烯二酸马来酸酐）可以有效地增强具有核壳结构改性剂的回收PC的增韧效果。共混物中相容剂的存在降低了界面张力，对聚结引入了空间位阻，从而增强了PC结构域与PMMA壳之间的界面粘合力，并改善了核壳结构颗粒在PC基质中的分散性。三元共混物通过使颗粒空化而获得高的抗冲击性，这减轻了三轴应力并促进了基质的大量剪切屈服，然后使基质能够通过平面应力韧性的撕裂模式断裂。此外，MSiS具有硅树脂芯，可以有效地抑制回收PC的燃烧。包含7 wt％MSiS和3 wt％相容剂的共混物在垂直燃烧测试中可以达到UL94 V-0等级。我们提出，在燃烧过程中，MSiS颗粒在PC基质中的良好分散有利于MSiS的快速迁移，并在改性PC的表面上形成均匀且高度阻燃的炭阻隔层。

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