Summary
A triblock copolymer of isotactic(it)-poly(methyl methacrylate) (PMMA) and polyisobutylene (PIB), it-PMMA-block-PIB-block-it-PMMA, was prepared by anionic polymerization of triphenylmethyl methacrylate initiated with α, ω-dilithiated PIB diisobutyrate in tetrahydrofuran at -78°C, and subsequntt hydrolysis and methylation with diazomethane. Molecular weight distribution of the triblock copolymer was narrow, and the stereoregularity of the PMMA block was highly isotactic. Proton spin-lattice relaxation times of the block copolymer in acetone-d6, which is non-solvent for PIB but dissolves the block copolymer, indicate the aggregation of the copolymer through PIB block. Stereocomplex formation between the it-block copolymer and syndiotactic(st)-PMMA-block-PIB-block-st-PMMA was also studied.
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Nishiura, T., Kitayama, T. & Hatada, K. Preparation of stereoregular block copolymer comprising isotactic PMMA and polyisobutylene blocks and its characterization. Polymer Bulletin 27, 615–622 (1992). https://doi.org/10.1007/BF00297430
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DOI: https://doi.org/10.1007/BF00297430