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首页> 外文期刊>Journal of Applied Polymer Science >Polypropylene/polystyrene blends prepared by diffusion and subsequent polymerization in polypropylene pellets after injection molding
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Polypropylene/polystyrene blends prepared by diffusion and subsequent polymerization in polypropylene pellets after injection molding

机译：在注塑后通过扩散和随后聚合在聚丙烯粒料中制备的聚丙烯/聚苯乙烯共混物

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PP/PS quasi-nanoblend pellets were synthesized by diffusion and subsequent polymerization of styrene in iPP pellets via a two-step procedure and then processed by injection molding. The PS distributions along the thickness direction of the molded bars were investigated by Micro-FTIR, showing almost homogeneous distribution no matter whether the PS distribution in the blend pellets is homogeneous. The morphology of the molded bars was investigated by FESEM, revealing two types of particles (small spherical and bigger irregular-shaped complex aggregates) and good interfacial adhesion between particles and matrix. The particles are mainly in nano and submicron sizes, and only few particles approach 1 mu m. The mechanical properties of the molded bars were evaluated by uniaxial tensile testing, showing a significant reinforcing effect without significantly loosing ductility. The yield strength of all the blends increase 20-27% compared to neat PP and the elongations at break are all over 300%. The remarkable mechanical properties of the molded bars were correlated with their morphology. (C) 2016 Wiley Periodicals, Inc.
机译：PP / PS准纳米共混物颗粒是通过两步程序通过苯乙烯在iPP颗粒中的扩散和随后的聚合反应合成的，然后通过注塑成型进行加工。通过Micro-FTIR研究沿成型棒的厚度方向的PS分布，无论共混颗粒中的PS分布是否均匀，都显示出几乎均匀的分布。用FESEM研究了成型棒的形态，发现了两种类型的颗粒（小球形和较大的不规则形状的复合聚集体），并且颗粒与基体之间具有良好的界面粘合性。颗粒主要为纳米和亚微米尺寸，只有极少数颗粒接近1微米。通过单轴拉伸试验评估模制棒的机械性能，显示出显着的增强效果而没有明显的延展性。与纯聚丙烯相比，所有共混物的屈服强度提高20-27％，断裂伸长率均超过300％。成型条的卓越机械性能与其形态相关。 （C）2016威利期刊公司

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