Metal‐Free Ring‐Opening Alternating Copolymerization of Epoxides and Cyclic Anhydrides Mediated by a Ternary Phosphazene Base and Carboxylic Acids,Macromolecular Chemistry and Physics

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Metal‐Free Ring‐Opening Alternating Copolymerization of Epoxides and Cyclic Anhydrides Mediated by a Ternary Phosphazene Base and Carboxylic Acids
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2019-11-18 , DOI: 10.1002/macp.201900416
Xinhui Kou ₁ , Yongzheng Li ₁ , Yong Shen ₂ , Zhibo Li ₁

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Organocatalytic, metal‐free ring‐opening alternating copolymerization (ROAP) of epoxides and cyclic anhydrides to produce polyesters with well‐defined alternating structure remains a challenge despite several organocatalysts having been reported. Herein, the ROAP of cyclohexene oxide (CHO) with phthalic anhydride (PA) using a series of carboxylic acids as initiator in the presence of an organic cyclic trimetric phosphazene base (CTPB) as catalyst is reported. The molar ratio of CTPB to carboxylic acid is proven to be crucial to obtain polyester with well‐defined alternating structure without formation of polyether homopolymer. The effects of carboxylic acid, temperature and feed molar ratio on monomer conversions and resultant molecular weights of poly(PA‐alt‐CHO) are systematically investigated. This work enriches the opinion of initiator for the ROAP of epoxides and cyclic anhydrides.

中文翻译：

三元磷腈碱和羧酸介导的环氧化物和环酐的无金属开环交替共聚

环氧化物和环状酸酐的有机催化，无金属开环交替共聚（ROAP），以生产具有明确交替结构的聚酯仍然是一个挑战，尽管已经报道了几种有机催化剂。在本文中，报道了在有机环状三级磷腈碱（CTPB）作为催化剂的情况下，使用一系列羧酸作为引发剂的环己烯氧化物（CHO）与邻苯二甲酸酐（PA）的ROAP。事实证明，CTPB与羧酸的摩尔比对于获得具有明确定义的交替结构而不形成聚醚均聚物的聚酯至关重要。羧酸，温度和进料摩尔比对单体转化率和聚（PA- alt）分子量的影响-CHO）被系统地调查。这项工作丰富了引发剂对环氧化物和环酐的ROAP的看法。

更新日期：2019-11-18

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