Controlled Synthesis of Densely Grafted Bottlebrushes That Bear Helical Polyisocyanide Side Chains on Polyisocyanide Backbones and Exhibit Greatly Increased Viscosity,Macromolecules

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Controlled Synthesis of Densely Grafted Bottlebrushes That Bear Helical Polyisocyanide Side Chains on Polyisocyanide Backbones and Exhibit Greatly Increased Viscosity
Macromolecules ( IF 5.1 ) Pub Date : 2020-04-07 , DOI: 10.1021/acs.macromol.9b02032
Yi-Xu Su ₁ , Lei Xu ₁ , Xun-Hui Xu ₁ , Xiao-Hua Hou ₁ , Na Liu ₁ , Zong-Quan Wu ₁

Affiliation

The precise synthesis of a new series of densely grafted bottlebrushes that bear helical polyisocyanide side chains on polyisocyanide backbones is described. New C1 polymers, polyisocyanides that bear active pentafluorophenol ester pendants, were first prepared and then installed with a Pd(II) catalyst on each backbone carbon via transesterification. All the Pd(II)-catalyst pendants could efficiently catalyze the living polymerization of isocyanide monomers, leading to the formation of densely grafted bottlebrush polymers. The grafting density could be facilely tuned through changing the content of Pd(II) pendants on the backbone. Because both the backbone and the side chain were synthesized via living chain-growth polymerizations, a variety of bottlebrush polymers and core–shell bottlebrushes with different compositions and controlled structures were prepared. The new synthetic bottlebrush polymers showed distinctively enhanced viscosity and modulus which could be further regulated via varying the grafting density.

中文翻译：

受控合成稠密接枝的牙刷，该牙刷在聚异氰酸酯骨架上带有螺旋状的聚异氰酸酯侧链，并且粘度大大提高

描述了一系列新的紧密接枝的牙刷的精确合成，这些牙刷在聚异氰酸酯主链上带有螺旋状的聚异氰酸酯侧链。首先制备具有活性五氟苯酚酯侧基的新型C1聚合物，即多异氰酸酯，然后通过酯交换反应将Pd（II）催化剂安装在每个主链碳上。所有的Pd（II）催化剂侧基均可有效催化异氰酸酯单体的活性聚合，从而导致形成密集接枝的牙刷聚合物。可以通过更改骨架上Pd（II）侧基的含量来轻松调整接枝密度。因为主链和侧链都是通过活性链增长聚合合成的，制备了各种具有不同成分和受控结构的洗瓶刷聚合物和核壳洗瓶刷。新的合成瓶刷聚合物显示出显着提高的粘度和模量，可以通过改变接枝密度进一步调节。

更新日期：2020-04-07

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