链式转移
木筏
可逆加成-断裂链转移聚合
共聚物
高分子化学
化学
自由基聚合
材料科学
化学工程
聚合
聚合物
有机化学
工程类
作者
Henry Foster,Martina H. Stenzel,Robert Chapman
出处
期刊:Macromolecules
[American Chemical Society]
日期:2022-07-06
卷期号:55 (14): 5938-5945
被引量:11
标识
DOI:10.1021/acs.macromol.2c00936
摘要
We show that photoinitiated electron/energy transfer–reversible addition–fragmentation chain transfer (PET-RAFT) enables vastly superior control over the polymerization of multiblock star copolymers compared to conventional techniques. Monomodal distributions with dispersities <1.3 could be achieved after the 10th block despite pushing the polymerization to >95% conversion in each block extension. The improvement in control is likely due to the reabsorption of the free radical at the propagating chain end by the excited catalyst, which would otherwise lead to a termination product. Simple modeling shows the dramatic effect that this has in the case of star polymerizations. Because PET-RAFT is also tolerant to oxygen, we were able to automate the synthesis of up to heptablock stars at short block lengths, providing a useful technique for screening the effect of polymer composition on the solution structure.
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