Two-phase (Water/Organic) Free Radical Polymerization of Water-soluble Vinyl Monomers Initiated by Water-insoluble Initiators U sing Alkylated p-Cyclodextrins as Initiator Carriers

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  • KUNIEDA Norio
    Department of Applied Chemistry, Faculty of Engineering, Osaka City University;
  • RYOSHI Hiroto
    Department of Applied Chemistry, Faculty of Engineering, Osaka City University;
  • YAMAGATA Kazuo
    Department of Applied Chemistry, Faculty of Engineering, Osaka City University;
  • KINOSHITA Masayoshi
    Department of Applied Chemistry, Faculty of Engineering, Osaka City University;

Bibliographic Information

Other Title
  • アルキル化β-シクロデキストリンを開始剤キャリヤーとする水溶性モノマーの油溶性開始剤による二相系(水相一有機相)ラジカル重合
  • Two-phase (water/organic) free radical polymerization of water-soluble vinyl monomers initiated by water-insoluble initiators using alkylated .BETA.-cyclodextrins as initiator carriers.

Abstract

The alkylated p-cyclodextrins, heptakis(2, 3, 6-O-trialkyl)-/3-cyclodextrin[alkyl group: -(CH2)., -CH8, n=0-11], remarkably increase the polymerization rate of water-soluble viny l monomers using water-insoluble free radical initiators in the two-phase system consisting of water and organic solvent (chloroform/ligroine, volume ratio 1: 4). For example, in the polymerization of acrylamide initiated by benzoyl peroxide (BPO), the addition of about 2equivalents of alkylated /3-cyclodextrin (n=11), based on BPO, to the polymerization system increased the conversion by 10.6 times. Moreover, the conversion was accelerated by increasing the alkyl chain length of alkylated p-cyclodextrins added. In this polymerization, the lipophilic character of the alkylated p-cyclodextrins, as well as their ability to form an inclusion complex with the initiators, play an important role. Based on this finding, the alkylated p-cyclodextrins are supposed to act as the initiator carrier. That is, the waterinsoluble initiator (or radical species generated from the initiator) in the organic phase is entrapped with the lipophilic alkylated S-cyclodextrin and then effectively transferred to the aqueous phase to initiate the polymerization of water-soluble vinyl monomers.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1989 (9), 1620-1627, 1989-09-10

    The Chemical Society of Japan

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