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Macromolecules最新上线文章：Janus Polymerization
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Janus Polymerization ABSTRACT: Is it possible to combine cationic and (coordinated) anionic ring-opening polymerizations (CROP and AROP) into a unimolecular chain? In this work, we design polymerizations of ε -caprolactone (CL) and tetrahydrofuran (THF) using a single catalytic system of lutetium tri fl ate/propylene oxide (Lu(OTf) 3 /PO) in which a cationic copolymerization of THF with CL and an AROP of CL perform at two chain ends of a growing chain. Kinetic and mechanistic studies demonstrate that the two chain-growth ROPs which have no mutual interference up to 90% of CL conversion keep a living manner producing diblock copolymers of PCL-b-P(THF-co-CL) with narrow polydispersities below 1.2. Afterward, the depletion of CL triggers a fi nal step-growth polymerization via intermolecular coupling reaction of cationic and anionic chain ends, developing multiblock polyester − polyether elastomers of [PCL-b-P(THF-co-CL)] m . A concept of “ Janus polymerization ” is de fi ned as a combination of cationic and anionic polymerizations on the two ends of a single growing chain, involving an initially living chain-growth polymerization and a subsequently self-triggered step-growth polycondensation.  |
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2014-03-18 18:00:39, 1.62 M
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_S_B_2楼
2014-03-18 19:38
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五星好评 顶一下，感谢分享！
2014-03-24 17:44
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2014-05-04 06:58
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五星好评 顶一下，感谢分享！
2014-05-04 17:11
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2014-11-12 18:37
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五星好评 顶一下，感谢分享！
p3ht7楼
2018-07-09 17:29
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五星好评 顶一下，感谢分享！