Summary
A new approach has been developed to transform the cationic polymerization of tetrahydrofuran (THF) into anionic block copolymerization of methyl methacrylate (MMA). Several telechelic polytetrahydrofurans with secondary amine end-groups (PTHF-NHR, where R = benzyl, n-butyl or phenyl) have been synthesized. The PTHF-NHR, where R is a phenyl group, can be almost completely metallated by sodium naphthalene to form the polymeric anion which will initiate quantitative polymerization of MMA to form a block copolymer, poly(MMA-b-THF-b-MMA), exhibiting thermoplastic elastomer properties of tensile strength 157kg/cm2 and elongation 700%.
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Shen-Son, T., Hong-Zhi, Z. & Xin-De (S.T. Voong), F. Transformation of cationic polymerization of tetrahydrofuran into anionic block copolymerization of methyl methacrylate. Polymer Bulletin 8, 219–224 (1982). https://doi.org/10.1007/BF00700281
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DOI: https://doi.org/10.1007/BF00700281