期刊
MACROMOLECULES
卷 51, 期 3, 页码 791-800出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.7b02231
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资金
- Qianjiang Talent-D Foundation [QJD1702025]
- National Natural Science Foundation of China [21674090]
- National Science Foundation [CHE-1665258]
- Robert A. Welch Foundation [A-0923]
- Zhejiang University from China
Immortal copolymerization of epoxides/CO2 using macro-chain-transfer agent (macro-CTA) is a useful method to prepare CO2-based block copolymers for manufacturing high value-added materials. Despite a variety of CO2-based block copolymers that have been reported using distinct macro-CTAs, issues including catalytic activity and blocking efficiency for the immortal polymerization remain superficially understood. Here, we systematically studied the reaction activity and blocking efficiency by using various macro-CTAs (including PPG, PEG, and PS) in the presence of two classical catalyst systems ((BDI)ZnOAc and SalenCoTFA/PPN-TFA). By analysis of the gel permeation chromatograms via mathematical deconvolution, it comes to a conclusion that the size, nature, and ratio of [macro-CTA]/[Cat.] strongly influence the catalytic activity of the reaction and blocking efficiency for the resultant block copolymers. Thin film self-assembly of PS/PPC block copolymers was investigated, and the results were analyzed by SEM to ascertain the impact of blocking efficiency on nanoassembly.
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