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首页> 外文期刊>Journal of Applied Polymer Science >Surface Modification Effects of Core-Shell Rubber Particles on the Toughening of Poly(butylene terephthalate)
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Surface Modification Effects of Core-Shell Rubber Particles on the Toughening of Poly(butylene terephthalate)

机译：核壳橡胶颗粒的表面改性对聚对苯二甲酸丁二醇酯的增韧作用

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摘要

We toughened poly(butylene terephthalate) (PBT) by loading core-shell number CSR) type impact modifiers, consisting of a rubbery poly(n-butyl acrylate) core and a rigid poly(methyl methacrylate) shall. To optimize the dispersion of CSR particles into the PBT matrix during melt compounding, the shell surface was modified with different grafting ratios of glycidyl methacrylate (GMA) reactive with PBT chain ends. In PBT blends with a 20 wt % CSR loading, the dispersed rubbery phases showed discernible shapes depending on the grafted GMA content, from predetermined spheres with 0.25 +/- 0.05 mu m diameters to their aggregates in the 2-3 mu m diameter range. As a result, the interparticle spacing (tau) could be controlled from 0.25 to 4.0 mu m in the PBT blends containing the fixed rubber loading. The Izod impact strengths of these samples increased significantly below tau = 0.4 mu m. Additional thermal and morphological analyses strongly Supported the hypothesis that the marked increase in toughness of the blends was related to less ordered lamellar formation of the PBT matrix under the confined geometry.
机译：我们通过加载核壳数CSR）型抗冲改性剂来增韧聚对苯二甲酸丁二酯（PBT），该抗冲改性剂由橡胶状聚丙烯酸正丁酯核和刚性聚甲基丙烯酸甲酯组成。为了优化熔融混配过程中CSR颗粒在PBT基质中的分散，用与PBT链端反应的甲基丙烯酸缩水甘油酯（GMA）的不同接枝率修饰了壳表面。在具有20 wt％CSR负载的PBT共混物中，分散的橡胶相根据接枝的GMA含量显示出可分辨的形状，从直径0.25 +/- 0.05微米的预定球体到直径2-3微米的聚集体。结果，在包含固定橡胶负载的PBT共混物中，颗粒间间距（tau）可以控制在0.25至4.0μm。在tau = 0.4微米以下时，这些样品的悬臂梁式冲击强度显着提高。额外的热学和形态学分析有力地支持了以下假设：共混物韧性的显着提高与在受限几何形状下PBT基质层状排列的排列不规则有关。

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