Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
권호 표지

synthesis of High Molecular Weight Poly(vinyl Alcohol)(2)-Preparation of Syndiotacticity-Rich Ultrahigh Molecular Weight Poly(vinyl Alcohol) by the Solution Polymerization of Vinyl Pivalate and Its Characterization-

고분자량 폴리비닐알코올의 합성에 관한 연구(II) -피발산비닐의 용액중합에 의한 고교대배열 초고분자량 폴리비닐알코올의 제조 및 특성해석-

  • Ryu, Won-Seok (Department of Fiber and Polymer Science, Seoul National University) ;
  • Kim, Beom-Jun (Department of Fiber and Polymer Science, Seoul National University)
  • 류원석 (서울대학교 공과대학 섬유고분자공학과) ;
  • 김범준 (서울대학교 공과대학 섬유고분자공학과)
  • Published : 1996.03.01

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Abstract

Vinyl pivalate(VPi) was solution-polymerized at 40℃ using 2,2'-azobis(2,4-dimethyl-valeronitrile)(ADMVN) as initiator and dimethyl sulfoxide(DMSO) and tertiary butyl alcohol(IBA) as solvents, respectively. Syndiotacticity-rich ultrahigh molecular weight poly(vinyl alcohoI)(PVA) microsbrillar Sber having number-average degree of polymerization(p ) of 12,400∼15,600, syndiotactic died(S-diad) content of 58∼61% could be prepared by the special sapohification method of synthesized poly(vinyl pivalate) having P of 26,800∼32,600. P of PVA using TBA was larger than that of PVA using DMSO. On the other hand, the conversion of the former was smaller than that of the latter, and it was found that the polymerization rate of VPi in TBA was lower than that in DMSO. P of PVA was constant and independent of the increase of P of PVPi contrary to the increase of conversion. The syndiotacticity and crystal melting temperature of PVA from PVPi polymerized in TBA were much superior to those of PVA from PVPi in DMSO.

Keywords

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