Clean Technology (청정기술)
- Volume 12 Issue 4
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- Pages.191-197
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- 2006
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- 1598-9712(pISSN)
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- 2288-0690(eISSN)
Preparation of Poly(Vinyl Acetate) in the Presence of Supercritical Carbon Dioxide
초임계이산화탄소를 이용한 폴리비닐아세테이트 합성
- Paek, Sang-Min (School of Display and Chemical Engineering, Yeungnam University) ;
- Noh, Seok-Kyun (School of Display and Chemical Engineering, Yeungnam University) ;
- Lyoo, Won Seok (School of Textiles, Yeungnam University) ;
- Shim, Jae-Jin (School of Display and Chemical Engineering, Yeungnam University)
- Received : 2006.11.29
- Accepted : 2006.12.12
- Published : 2006.12.01
Abstract
Polymerization in supercritical carbon dioxide has been getting attention since it is easier to separate the remaining reactants from product polymer and since it is a cleaner process that produces neither wastewater nor air pollutants, compared to the conventional polymerization processes. In this study, poly(vinyl acetate) (PVAc) that is necessary in producing poly(vinyl alcohol) (PVA) with a lot of industrial applications was manufactured in the presence of supercritical carbon dioxide for the second time in the world. A poly(dimethylsiloxane)(PDMS)-derivative surfactant and three initiators were employed in the polymerization of vinyl acetate (VAc) at 338.15 K and 34.5 MPa. Investigation was carried out to find out the effect of the amounts and types of initiators and surfactants as well as the effect of reaction time on the yield and the molecular weight of PVAc. The weight average molecular weight (Mw) of PVAc was in the range of 60,000 ~ 140,000 g/mol, and the number average molecular weight was in the range of 30,000 ~ 70,000 g/mol. The yield of PVAc was spread over 10 ~ 80%, based on the amount of VAc monomer.
초임계이산화탄소 내에서의 고분자중합은 생성된 고분자와 미반응물질의 분리가 용이하며, 유기용매나 물을 매체로 사용하는 기존의 고분자합성법에서와는 달리 무독성의
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