Incorporating a polar functional group into macromolecular chains of rubber materials via coordination polymerization is a theoretical challenge. In this work, we report the coordination copolymerization of a new polar diene-based monomer, 2-(3-methylidenepent-4-en-1-yl)pyridine (MPEP), with isoprene or butadiene using a ternary catalytic system composed of bis(phosphino)carbazolideyttriumbis(alkyl) complex, [Ph₃C][B(C₆F₅)₄] and AlEt₃. The resultant copolymers have high cis-1,4 regularity (>97%) as well as tuneable polar monomer incorporation ratios. In addition, the pendant polar pyridine groups can be clearly and quantitatively converted into pyridine quaternary ammonium chloride or the iodide salt under mild conditions. Aggregation of the quaternary ammonium salt plays the role of a physical crosslinking joint, which endows the copolymer with high mechanical properties and improved polarity. Moreover, these ionic crosslinking polyisoprene-based elastomers exhibit remarkable thermal reshaping and recycling properties.

中文翻译：

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二烯与极性2-（3-亚甲基戊基-4-烯-1-基）吡啶的高选择性顺式1,4共聚：一种可回收弹性体的方法

通过配位聚合将极性官能团结合到橡胶材料的大分子链中是一项理论挑战。在这项工作中，我们报告了一种新的基于极性二烯的单体2-（3-甲基亚戊基-4-en-1-基）吡啶（MPEP）与异戊二烯或丁二烯的配位共聚反应，该反应由双三元组成（膦基）咔唑基钇二（烷基）络合物，[Ph ₃ C] [B（C ₆ F ₅）₄ ]和AlEt ₃。所得共聚物具有高顺式-1,4规整度（> 97％）以及可调节的极性单体掺入比例。另外，在温和条件下，侧基极性吡啶基团可以清楚地和定量地转化为吡啶季铵氯化物或碘化物盐。季铵盐的聚集起物理交联作用，使共聚物具有较高的机械性能和改善的极性。而且，这些基于离子交联的聚异戊二烯基弹性体表现出显着的热重塑和再循环特性。