Styrene Moiety-Carrying Diorganozinc Compound Preparation for Polystyrene-Poly(ethylene-co-1-hexene)-Polystyrene Triblock Copolymer Production,Macromolecules

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Styrene Moiety-Carrying Diorganozinc Compound Preparation for Polystyrene-Poly(ethylene-co-1-hexene)-Polystyrene Triblock Copolymer Production
Macromolecules ( IF 5.1 ) Pub Date : 2020-08-19 , DOI: 10.1021/acs.macromol.0c01253
Jong Chul Lee ₁ , Kyung Lee Park ₁ , Sung Moon Bae ₁ , Hyun Ju Lee ₁ , Jun Won Baek ₁ , Junseong Lee ₂ , Seokpil Sa ₃ , Eun Ji Shin ₃ , Ki Soo Lee ₃ , Bun Yeoul Lee ₁

Affiliation

Polystyrene (PS)-block-poly(ethylene-co-1-butene)-block-PS (SEBS), produced by PS-block-polybutadiene-block-PS hydrogenation, is a high-performance thermoplastic elastomer. Hydrogenation is costly and tedious, making SEBS market expansion difficult. Thus, we envisioned a new one-pot SEBS-like triblock copolymer synthetic scheme to grow PO chains from styrene moiety-carrying diorganozinc compounds by coordinative chain transfer polymerization (CCTP), followed by anionic styrene polymerization using a specially designed initiator, allowing PS chain growth from not only the styrene moieties but also the Zn–C sites. Large-scale preparation of highly pure styrene moiety-carrying diorganozinc compounds was one of the main challenges we faced, but we overcame it by synthesizing (CH₂═CHC₆H₄CH₂CH₂CH₂)₂Zn (4), a stable and crystalline solid that worked well as a CCTP agent. This enabled the preparation of PS-block-poly(ethylene-co-1-hexene)-block-PS (SEHS), which exhibited a stress–strain curve similar to that of the commercial-grade SEBS. The SEHS dispersed better in a polypropylene (PP) matrix, allowing it to act as a better toughening agent for PP blending than the commercial-grade SEBS. Moreover, SEHS was less viscous, exhibiting better workability.

中文翻译：

苯乙烯部分携带于聚苯乙烯-聚Diorganozinc复方制剂（乙烯-共-1-己烯） -聚苯乙烯三嵌段共聚物的生产

聚苯乙烯（PS） -嵌段-聚（乙烯-共-1-丁烯） -嵌段-PS（SEBS），通过PS-产生块-polybutadiene-块-PS氢化，是一种高性能的热塑性弹性体。氢化是昂贵且乏味的，这使得SEBS市场扩展困难。因此，我们设想了一种新的单锅SEBS型三嵌段共聚物合成方案，该方案通过配位链转移聚合（CCTP）从带有苯乙烯部分的二有机锌化合物中生长PO链，然后使用特殊设计的引发剂进行阴离子苯乙烯聚合，从而使PS链不仅从苯乙烯部分而且从Zn–C位置增长。高纯度的苯乙烯部分承载diorganozinc化合物的大规模制备是我们所面临的主要挑战之一，但我们通过合成克服它（CH ₂ = CHC ₆ H ^ ₄ CH ₂ CH ₂ CH ₂）₂ Zn（4），一种稳定的结晶固体，可以很好地用作CCTP剂。这使PS-的制备嵌段-聚（乙烯-共-1-己烯） -嵌段-PS（SEHS），其表现出类似于商业级SEBS的应力-应变曲线。SEHS在聚丙烯（PP）基质中的分散性更好，因此与商业级SEBS相比，它可以作为PP共混的更好的增韧剂。而且，SEHS的粘性较小，可加工性更好。

更新日期：2020-09-09

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