Tandem metathesis depolymerization and cyclopolymerization toward flexible–rigid block copolymers with unique damping properties,Polymer Chemistry

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Tandem metathesis depolymerization and cyclopolymerization toward flexible–rigid block copolymers with unique damping properties
Polymer Chemistry ( IF 4.1 ) Pub Date : 2022-05-23 , DOI: 10.1039/d2py00521b
Lingli Zhang ₁ , Ying Quan ₁ , Hao Wang ₁ , Huijing Han ₁ , Xiaojuan Liao ₁ , Ruyi Sun ₁ , Meiran Xie ₁

Affiliation

Metathesis depolymerization (MDP) of natural rubber (NR) was readily conducted to afford depolymerized NR (dNR_x) bearing a living chain end, which can initiate metathesis cyclopolymerization (MCP) of 1,6-heptadiyne monomers to yield conjugated polyacetylene (PA) derivatives, and thus block copolymers consisting of a rubbery dNR_x segment and a plastic PA segment were achieved by this newly constructed tandem MDP–MCP strategy. Importantly, triblock copolymers containing a flexible dNR_x segment and rigid ionic PA segment possessed good mechanical properties, and exhibited distinctive damping performance with a unique relaxation plateau covering a broad temperature range, which could be further enhanced by modifying triblock copolymers with bromo-functionalized triazolinedione derived from biobased oleic acid. Therefore, the developed MDP–MCP method should become a feasible technique with expanded applications in the remodeling of unsaturated polymers for providing flexible–rigid functional block copolymers.

中文翻译：

串联复分解解聚和环聚合制备具有独特阻尼特性的软硬嵌段共聚物

天然橡胶 (NR) 的易位解聚 (MDP) 很容易得到带有活性链端的解聚 NR ( d NR _x )，它可以引发 1,6-庚二炔单体的易位环聚合 (MCP) 生成共轭聚乙炔 (PA) ) 衍生物，因此由橡胶状d NR _x链段和塑料 PA 链段组成的嵌段共聚物是通过这种新构建的串联 MDP-MCP 策略实现的。重要的是，含有柔性d NR _{x的三嵌段共聚物}段和刚性离子 PA 段具有良好的机械性能，并表现出独特的阻尼性能和独特的弛豫平台，覆盖广泛的温度范围，可以通过用生物基油酸衍生的溴官能化三唑啉二酮改性三嵌段共聚物进一步增强。因此，开发的 MDP-MCP 方法应该成为一种可行的技术，在不饱和聚合物的重塑中具有广泛的应用，以提供柔性-刚性功能性嵌段共聚物。

更新日期：2022-05-23

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