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首页> 外文期刊>Reactive & Functional Polymers >In situ reactive compatibilization of polypropylene/trans-1,4-poly(isoprene-co-butadiene) rubber (TBIR) blends with balanced toughness and stiffness via dynamic vulcanization
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In situ reactive compatibilization of polypropylene/trans-1,4-poly(isoprene-co-butadiene) rubber (TBIR) blends with balanced toughness and stiffness via dynamic vulcanization

机译：聚丙烯/反式1,4-聚（异戊二烯-共-丁二烯）橡胶（TBIR）共混物的原位反应相容性，通过动态硫化实现了平衡的韧性和刚度

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摘要

Toughening polypropylene (PP) with the good balance of toughness and stiffness was achieved via dynamic vulcanization technology by blending with trans-1,4-poly(isoprene-co-butadiene) rubber (TBIR), a novel copolymer containing trans-polyisoprene blocks with glass transition temperature (Tg) around -70 degrees C and melting temperature (Tm) around 25-45 degrees C. Dynamically vulcanized PP/TBIR blends (PP/TBIR DV blends) using sulfur as crosslinking agent was prepared and the phase morphology, glass transition temperature (Tg), crystalline behaviors and mechanical properties of the PP/TBIR DV blends were investigated in details. The PP/TBIR DV blends with 20-25phr TBIR incorporation presented outstanding notched Izod impact strength (12 times higher than that of pure PP) and a high-level tensile strength (about 24 MPa). The TBIR rubber phase was dispersed uniformly in the PP/TBIR DV blends with domain size around 500 nm, and was showed little change with an increase of TBIR content. DMA results demonstrated that the dynamic vulcanization crosslinking enhanced the interface compatibility between PP and TBIR through the increased Tg of both TBIR and PP domains, in which TBIR domains presented more influence. WAXD results showed that the crystallinity of PP decreased slightly, while the crystallinity of TBIR was reduced by 50%. The evolution of morphology and compatibility of the PP/TBIR DV blends were investigated and discussed in detail. Dynamic vulcanization under the optimum curing reaction time definitely hindered the coalescent of the TBIR particle due to the decreased particle adhesion. The co-crosslinking of TBIR and PP caused by dynamic vulcanization improved the compatibility between PP and TBIR obviously.
机译：通过动态硫化技术，通过与反式1,4-聚（异戊二烯-共-丁二烯）橡胶（TBIR）共混，实现了具有良好韧性和刚度平衡的增韧聚丙烯（PP），该新型共聚物含有反式聚异戊二烯嵌段和玻璃化转变温度（Tg）约为-70摄氏度，熔融温度（Tm）约为25-45摄氏度。使用硫磺作为交联剂，动态硫化了PP / TBIR混合物（PP / TBIR DV混合物），制备了玻璃的相态详细研究了PP / TBIR DV共混物的转变温度（Tg），结晶行为和机械性能。掺入20-25phr TBIR的PP / TBIR DV共混物具有出色的缺口悬臂梁式冲击强度（比纯PP高12倍）和高水平的拉伸强度（约24 MPa）。 TBIR橡胶相均匀地分散在PP / TBIR DV共混物中，畴尺寸约为500 nm，并且随着TBIR含量的增加几乎没有变化。 DMA结果表明，动态硫化交联通过增加TBIR和PP域的Tg来增强PP和TBIR之间的界面相容性，其中TBIR域表现出更大的影响。 WAXD结果表明，PP的结晶度略有降低，而TBIR的结晶度降低了50％。对PP / TBIR DV共混物的形态和相容性演变进行了研究和详细讨论。在最佳固化反应时间下进行动态硫化，由于降低的颗粒附着力，无疑会阻碍TBIR颗粒的聚结。动态硫化引起的TBIR和PP的共交联明显改善了PP和TBIR之间的相容性。

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