聚酯纤维
邻苯二甲酸酐
共聚物
材料科学
磷腈
酯交换
环氧化物
溶剂
环氧乙烷
催化作用
高分子化学
有机化学
化学
聚合物
复合材料
作者
Heng Li,Junpeng Zhao,Guangzhao Zhang
出处
期刊:ACS Macro Letters
[American Chemical Society]
日期:2017-09-20
卷期号:6 (10): 1094-1098
被引量:94
标识
DOI:10.1021/acsmacrolett.7b00654
摘要
A major success has been made on organocatalytic ring-opening alternating copolymerization (ROAP) of phthalic anhydride and ethylene oxide (EO) by use of a simple phosphazene base (t-BuP1). Polyesters with perfectly alternating sequence distribution, controlled molar masses, and low dispersities (ĐM < 1.1) are obtained. The ROAP exhibited a distinct living nature so that block, nonlinear, end-functional structures and postpolymerization modification of the alternating polyesters are readily achieved. Solvent, excess EO, and catalyst can be effortlessly recovered and reused. The ideally suitable basicity of t-BuP1 is considered crucial for the high selectivity and neatness of the ROAP, which engenders a self-buffering mechanism rendering the carboxy and hydroxy terminals appropriately active to allow chain growth in an strictly alternating manner and complete avoidance of side reactions (epoxide self-propagation, transesterification) even at full conversion of the anhydride.
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