共聚物
聚合物
高分子化学
环氧乙烷
化学
原子转移自由基聚合
聚合
苯乙烯
材料科学
有机化学
作者
Wei Fan,Feifei Chen,Min Li
出处
期刊:Polymer
[Elsevier]
日期:2022-05-01
卷期号:250: 124782-124782
被引量:4
标识
DOI:10.1016/j.polymer.2022.124782
摘要
This paper elaborated the preparation of spiro-shaped multicyclic polymer with repeating heterocyclics. Block copolymer PEO-PS-Br was prepared by atom transfer radical polymerization (ATRP) of styrene (St) with a poly(ethylene oxide) telechelic macroinitiator PEO-Cou-Br, in which both ends of PEO chain were capped by coumarin groups in advance. After azidation of terminal bromine, bimolecular cyclization was conducted with a diyne as difunctional linker to provide heterocyclic polymer with coumarin groups at the boundaries between PEO and PS blocks. The heterocyclic polymer was exposed to UV irradiation at 365 nm to afford spiro-shaped multicyclic polymer via dimerization of coumarin. GPC, 1H NMR and FT-IR were used to characterize obtained products. Photocleavage of multicyclic polymer under irradiation of 254 nm was also investigated, and GPC trace suggests the successful cleavage from spiro-shaped structure to monocycles.
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