Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
권호 표지

Synthesis of High Molecular Weight Poly(vinyl Alcohol)(I)-Effect of Emulsion Polymerization Conditions of Vinyl Acetate on the Molecular Weight of Poly(vinyl Alcohol)-

고분자량 폴리비닐알코올의 합성에 관한 연구(I) -아세트산비닐의 에멀젼중합 조건이 폴리비닐알코올의 분자량에 미치는 영향-

  • 류원석 (서울대학교 공과대학 섬유고분자공학과) ;
  • 하완식 (서울대학교 공과대학 섬유고분자공학과)
  • Published : 1996.02.01

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Abstract

Poly(vinyl acetate)(PVAc) was obtained via emulsion polymerization of vinyl acetate at various conditions, and then poly(vinyl alcohol)(PVA) having maximum number-average degree of polymerization ($P_{n}$ ) of 3,600 was prepared by saponifying PVAc having of 14,000~15,000 and degree of branching for acetyl group of about 3~3.5 polymerized at 5$0^{\circ}C$ with concentrated alkaline aqueous solution. Syndiotactic dias content and crystal melting temperature of PVA slightly increased with a decrease in the polymerization temperature and the syndiotactic diad content and crystal melting temperature for PVA polymerized at 5$0^{\circ}C$ were about 49~50% and 229$^{\circ}C$C, respectively, independently of PVA.

Keywords

References

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