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首页> 外文期刊>Journal of Applied Polymer Science >Poly(methyl methacrylate) Toughening wiht Refractive Index-Controlled Core-Shell Composite Particles
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Poly(methyl methacrylate) Toughening wiht Refractive Index-Controlled Core-Shell Composite Particles

机译：具有折射率控制的核壳复合颗粒的聚甲基丙烯酸甲酯增韧

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摘要

Poly(butylacrylate-co-styrene)/poly(methyl methacrylate) (PMMA) coreshell composite particles having different refractive indexes were prepared by a twostage consecutive emulsion polymerization.The refractive index of the core phase was controlled by varying the incorporated amount of divinylbenzene (DVB) which acted as a crosslinking agent as well as a refractive index enhancer.The blends of these core-shell composite particles with PMMA showed an impact strength increment of about three times compared with that of the pure PMMA.However,as the amount DVB increased,the impact strength showed a tendency toward decreasing.This was caused by the loss of the elastic property of the core phase.The toughened PMMA blended with core-shell composite particles having the ocre crosslinked with 1 wt % DVB showed the best transparency.However,the transparency was rather decreased,as the difference of the refractive index between the core phase and the pure PMMA increased.This suggested that in the case of using the core-shell composite as a toughening agent for PMMA the matching of the refractive index of the core phase with that of the pure PMMA was one of key factors in maintaining the transparency of the toughened PMMA.
机译：通过两步连续乳液聚合制备具有不同折射率的聚丙烯酸丁酯-共苯乙烯/聚甲基丙烯酸甲酯（PMMA）核壳复合颗粒，通过改变二乙烯基苯的掺入量来控制核相的折射率（ DVB）作为交联剂和折射率增强剂。这些核-壳复合颗粒与PMMA的共混物的冲击强度比纯PMMA高约三倍。增强后，冲击强度呈下降趋势，这是由于芯相弹性性能的下降所致。增韧的PMMA与由1％（重量）DVB交联的核壳复合颗粒共混，表现出最佳的透明度。但是，随着芯相和纯PMMA折射率的差异增加，透明性降低了。在使用核-壳复合材料作为PMMA增韧剂的情况下，核相的折射率与纯PMMA的折射率匹配是保持增韧PMMA透明性的关键因素之一。

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