Cleavable multiblock copolymer synthesized by ring‐opening metathesis copolymerization of cyclooctene and macrocyclic olefin and its hydrolysis to give carboxyl‐telechelic polymer |
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| Authors: | Meiran Xie Weizhen Wang Liang Ding Jingwei Liu Dan Yang Ling Wei Yiqun Zhang |
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| Institution: | 1. Department of Chemistry, East China Normal University, Shanghai 200062, People's Republic of China;2. Department of Physics, East China Normal University, Shanghai 200062, People's Republic of China |
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| Abstract: | A novel cleavable multiblock copolymer was synthesized by ring‐opening metathesis polymerization (ROMP) of cyclooctene (COE) and a flexible 27‐membered macrocyclic olefin (MCO), which is acted as the spacer to collect the polymer structure block by block. MCO 2 was prepared via ring‐closing metathesis of the long chain alkyldiene, and then 2 was well‐ conducted ROMP with COE to provide the multiblock copolymer Poly(COE)‐ 2 ]m consisting of homo‐Poly(COE) blocks and ring‐opened 2 segments with different molecular weights (Mn = 30.0 – 249.6 × 103) and polydispersity index (PDI) within 1.45–1.67 as variation of the feed ratio of COE to 2 . The multiblock copolymer chain containing weak ester linkage can be cleaved under alkali condition to afford the carboxyl‐telechelic Poly(COE) blocks with much lower molecular weights (Mn,h = 3.6–35.7 × 103) and slight higher PDIs (1.65–1.88). The average block number on multiblock copolymer chain was obtained from the ratio of Mn to Mn,h and was reached up to the value of 7–16. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 380–388, 2010 |
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| Keywords: | cleavable multiblock copolymer macrocycles ring‐opening metathesis copolymerization telechelics |
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