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首页> 外文期刊>Journal of Applied Polymer Science >Syndiotactic polystyrene-b-atactic polypropylene block copolymer alloy as a compatibilizer for syndiotactic polystyrene/isotactic polypropylene blends
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Syndiotactic polystyrene-b-atactic polypropylene block copolymer alloy as a compatibilizer for syndiotactic polystyrene/isotactic polypropylene blends

机译：间规聚苯乙烯-b-间规聚丙烯嵌段共聚物合金，作为间规聚苯乙烯/间规聚丙烯共混物的相容剂

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摘要

A polymeric alloy (SP-A) containing syndiotactic polystyrene (sPS), atactic polypropylene (aPP), and about 66 wt % sPS-b-aPP diblock copolymer, was prepared by the sequential feed of monomers in the presence of the half-titanocene Cp*Ti(OBz)(3) (where Cp* is C5Me5 and Bz is PhCH2), modified methylaluminoxane, and external tri-isobutylaluminum. The effects of the SP-A alloy as a compatibilizer for sPS and isotactic polypropylene (iPP) blends were evaluated. The blending of sPS and iPP, with and without SP-A, was performed in a single-screw miniextruder with a side channel that allowed the continuous recycling of materials. The influence of SP-A on the mechanical and thermal properties of the immiscible sPS/iPP blends was investigated over a range of composition. The presence of the SP-A alloy resulted in a significant improvement of the impact strength of the blends compared with that of pure sPS and their pure blends. This improvement was particularly obvious in the sPS/iPP (90/10 wt %) blend containing 5 wt % SP-A. Morphological analysis of the impact-fractured surface of the ternary blends indicated that the sPS-b-aPP diblock copolymer contained in the SP-A alloy acted as an efficient compatibilizer by decreasing the dispersed-phase iPP particle size, improving the interfacial adhesion, and generating a stable microphase-separated state. (C) 2003 Wiley Periodicals, Inc. [References: 20]
机译：含有间同立构聚苯乙烯（sPS），无规立构聚丙烯（aPP）和约66 wt％sPS-b-aPP二嵌段共聚物的聚合物合金（SP-A）是通过在半茂钛存在下依次进料制备的Cp * Ti（OBz）（3）（其中Cp *是C5Me5，Bz是PhCH2），改性甲基铝氧烷和外部三异丁基铝。评估了SP-A合金作为sPS和全同立构聚丙烯（iPP）混合物的增容剂的效果。在带有或不带有SP-A的sPS和iPP的混合中，是在带有侧通道的单螺杆微型挤出机中进行的，从而可以连续回收材料。在一系列组成范围内，研究了SP-A对不溶混的sPS / iPP共混物的机械和热性能的影响。与纯sPS及其纯混合物相比，SP-A合金的存在显着提高了混合物的冲击强度。在包含5重量％SP-A的sPS / iPP（90/10重量％）共混物中，这种改善特别明显。对三元共混物冲击断裂表面的形态学分析表明，SP-A合金中包含的sPS-b-aPP二嵌段共聚物可通过减小分散相iPP粒径，改善界面附着力和提高相容性来起到有效的增容作用。产生稳定的微相分离状态。 （C）2003 Wiley Periodicals，Inc. [参考：20]

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