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One-pot synthesis of linear-hyperbranched diblock copolymers via self-condensing vinyl polymerization and ring opening polymerization Part A Polymer chemistry
- Zou, Peng, Yang, Li-Ping, Pan, Cai-Yuan
- Journal of polymer science 2008 v.46 no.23 pp. 7628-7636
- composite polymers, methanol, molecular weight, polymerization, synthesis
- The linear poly(ε-caprolacton)-b-hyperbrached poly(2-((α-bromobutyryl)oxy)ethyl acrylate) (LPCL-b-HPBBEA) has been successfully synthesized by simultaneous ring-opening polymerization (ROP) of CL and self-condensing vinyl polymerization (SCVP) of BBEA in one-pot. The HPBBEA homopolymers were found to be formed in the polymerization because of the competitive reactions induced by initiation with bifunctional initiator, 2-hydroxylethyl-2'-bromoisobutyrate (HEBiB), and inimer BBEA. The separation of LPCL-b-HPBBEA from the polymerization products was achieved by precipitation in methanol. With feed ratio increase of CL and BBEA to HEBiB, the molecular weights of PCL and HPBBEA blocks in the block copolymer enhanced; and the polymerization rate of CL started to decrease gradually after 12 h of polymerization, but the polymerization rate of BBEA was maintained until 24 h of polymerization.