Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Synthesis of High Molecular Weight Poly(vinyl Alcohol)(III)- Synthesis of High Molecular Weight Atactic Poly(vinyl Alcohol) by the Low Temperature-Redox Emulsion Polymerization of Vinyl Acetate and Its Characterization -

고분자량 폴리비닐알코올의 합성에 관한 연구(III) -아세트산비닐의 저온 레독스 에멀젼중합에 의한 고분자량 혼성배열 폴리비닐알코올의 합성 및 특성해석-

  • 류원석 (서울대학교 공과대학 섬유고분자공학과) ;
  • 곽영제 (서울대학교 공과대학 섬유고분자공학과)
  • Published : 1996.04.01

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Abstract

Poly(vinyl acetate)(PVAc) having low degree of branching of acetyl group lower than one was synthesized by the low temperature-redox emulsion polymerization of vinyl acetate at $0^{\circ}C$. Subsequent saponification yielded high molecular weight poly(vinyl alcohol)(PVA) having number-average degree of polymerization $P_n$ of 4,200. $P_n$ of PVA was constant and independent of the increase of $P_n$ of PVAc contrary to the increase of conversion. Whiteness, syndiotacticity, and crystal melting temperature of PVA increased with a decrease of the polymerization temperature. Syndiotactic triad and diad contents of PVA from PVAc polymerized at $0^{\circ}C$ were 28% and 53%, respectively. Also, crystal melting temperature of PVA from PVAc obtained at $0^{\circ}C$ was 232$^{\circ}C$.

Keywords

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