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Synthesis of thermally-induced phase separating polymer with well-defined polymer structure by living cationic polymerization. I. Synthesis of poly(vinyl ether)s with oxyethylene units in the pendant and its phase separation behavior in aqueous solution by Sadahito Aoshima; Hiroshi Oda; Eiichi Kobayashi is a Materials Science article available to read on EtoBox.

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## Abstract Living cationic polymerization of alkoxyethyl vinyl ether [CH~2~CHOCH~2~CH~2~OR; R: CH~3~ (MOVE), C~2~H~5~ (EOVE)] and related vinyl ethers with oxyethylene units in the pendant was achieved by 1‐(isobutoxy)ethyl acetate (1)/Et~1.5~AlCl~1.5~ initiating system in the presence of an added base (ethyl acetate or THF) in toluene at 0°C. The polymers had a very narrow molecular weight distribution (M̄~__w__~/M̄~__n__~ = 1.1–1.2) and the M̄~__n__~ proportionally increased with the progress of the polymerization reaction. On the other hand, the polymerization by 1/EtAlCl~2~ initiating system in the presence of ethyl acetate, which produces living polymer of isobutyl vinyl ether, yielded the nonliving polymer. When an aqueous solution of the polymers thus obtained was heated, the phase separation phenomenon was clearly observed in each polymer at a definite critical temperature (__T__~ps~). For example, __T__~ps~ was 70°C for poly(MOVE), and 20°C for poly(EOVE) (1 wt % aqueous solution, __M̄__~__n__~ ∼ 2 × 10^4^). The phase separation for each case was quite sensitive (Δ__T__~ps~ = 0.3–0.5°C) and reversible on heating and cooling. The __T__~ps~ or __ΔT__~ps~ was clearly depend

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Author

Sadahito Aoshima; Hiroshi Oda; Eiichi Kobayashi

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-624X)

Published

1992

Language

EN

Field

Materials Science (Physical Sciences)