MECHANOCHEMICAL REACTION OF POLYMERS BY ULTRASONIC IRRADIATION.(IV)

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  • FUJIWARA Hideki
    Department of Applied Chemistry, Osaka Institute of Technology
  • SASAKI Katsuhiro
    Department of Applied Chemistry, Osaka Institute of Technology
  • HOCHI Koichi
    Department of Applied Chemistry, Osaka Institute of Technology
  • GOTO Kunio
    Department of Applied Chemistry, Osaka Institute of Technology

Bibliographic Information

Other Title
  • 超音波によるポリブタジエンスチレン及びメタクリル酸メチルのメカノケミカル共重合
  • 超音波によるポリブタジエンースチレン及びメタクリル酸メチルのメカノケミカル共重合〔超音波照射によるポリマーのメカノケミカル反応-4-〕
  • チョウオンパ ニヨル ポリブタジエン スチレン オヨビ メタクリルサン メチル
  • MECHANOCHEMICAL COPOLYMERIZATION IN MIXTURES OF POLYBUTADIENE-STYRENE AND METHYL METHACRYLATE BY ULTRASONIC IRRADIATION

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Description

Mechanochemical block copolymerization in polybutadiene-styrene and methyl methacrylate mixtures has been studied by ultrasonic irradiation at 60°C. The results obtained were as follows:(1) Mechanical degradation of the polymer chain in the system polybutadiene-methyl methacrylate occurred rapidly and vigorously rather than that of polybutadien-estyrene mixtures. The rate constants kd for mechanical degradation were 2.54×10-7sec-1 in the former system and 0.81×10-7sec-1 in the latter.(2) In both systems, the initial rate of mechano-chemical copolymerization Rp decreased with increasing the initial concentration of polybutadiene.Rp in the system polybutadiene-methyl methacrylate was much faster than that of polybutadiene-styrene mixtures and Rp was given by: Rp∝[St].(3) The polymerization catalyst and that fragments which were contained within the original polybutadiene were deposited by the action of ultrasonic waves.(4) The formation of mechanochemical block copolymers and its proportion were confirmed and the apparent degree of blocking Db was approximately 42%. In addition, it was observed that even if the compatibility of the different polymers was bad, its compatibility was improved by the addition of both block copolymers.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 52 (4), 247-255, 1979

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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