Synthesis of CO2‑Based Block Copolymers via Chain Transfer Polymerization Using Macroinitiators: Activity, Blocking Efficiency, and Nanostructure
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2018 American Chemical Society. 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.
author list (cited authors)
Zhang, Y., Yang, G., Wang, Y., Lu, X., Wu, G., Zhang, Z., ... Xu, Z.
complete list of authors
Zhang, Yao-Yao||Yang, Guan-Wen||Wang, Yanyan||Lu, Xin-Yu||Wu, Guang-Peng||Zhang, Ze-Sheng||Wang, Kai||Zhang, Ruo-Yu||Nealey, Paul F||Darensbourg, Donald J||Xu, Zhi-Kang