Heterotactic-specific radical polymerization of N-isopropylacrylamide and phase transition behavior of aqueous solution of heterotactic poly(N-isopropylacrylamide)

Tomohiro Hirano, Takahiro Kamikubo, Yuya Okumura, Yoichi Bando, Ryosuke Yamaoka, Takeshi Mori, Koichi Ute

    Research output: Contribution to journalArticlepeer-review

    26 Citations (Scopus)

    Abstract

    Radical polymerization of N-isopropylacrylamide (NIPAAm) in toluene at low temperatures, in the presence of fluorinated-alcohols, produced heterotactic polymer comprising an alternating sequence of meso and racemo dyads. The heterotactic- ity reached 70% in triads when polymerization was carried out at -40 °C using non- afluoro-tert-butanol as the added alcohol. NMR analysis revealed that formation of a 1:1 complex of NIPAAm and fluorinated-alcohol through C=O-H-O hydrogen bonding induces the heterotactic specificity. A mechanism for the heterotactic-specific polymerization is proposed. Examination of the phase transition behavior of aqueous solutions of heterotactic poly(NIPAAm) revealed that the hysteresis of the phase transition between the heating and cooling cycles depended on the average length of meso dyads in poly(NIPAAm).

    Original languageEnglish
    Pages (from-to)2539-2550
    Number of pages12
    JournalJournal of Polymer Science, Part A: Polymer Chemistry
    Volume47
    Issue number10
    DOIs
    Publication statusPublished - May 15 2009

    All Science Journal Classification (ASJC) codes

    • Polymers and Plastics
    • Organic Chemistry
    • Materials Chemistry

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