Gelation beaviour of a-PVA solutions in wide range of standing temperature and different DMSO/H2O blending ratio
(0) Atactic poly (vinyl alcohol) (a-PVA) gels were obtained using mixed solvents of various ratios of water and dimethyl suloxide (DMSO) in wide range standing temperature between 50℃ and -78℃. The melting points of obtained a-PVA gels were measured by test-tube inversion method as the common determination test of gelation. With the decrease of the standing temperature at above 0℃, the sol areas gradually decreased in the order from medium DMSO content (30-80vol％) to high or low DMSO content (below 30vol％ or above 80vol％). The gelation temperature of a-PVA solution with DMSO 60vol％ could be up to 40℃. As for the freezing area, even if when standing temperature at -78℃ there still were nonfreezing areas at DMSO content 60 and 70vol％. When the standing temperature was below 0℃, the melting points of gels formed at the DMSO content of 30- 80vol％ were not so different and independent of a-PVA concentration.
poly (vinyl alcohol) gel melting point DMSO water
Lixing Dai Satoshi Hijioka Toshihisa Tanaka Kazuo Yamaura
College of Materials Engineering, Soochow University, 178 East Ganjiang Rd., Suzhou, Jiangsu 215021, Faculty of Textile Science & Technology, Shinshu University, Tokida 3-15-1, Ueda-city, Nagano-prefec
国际会议
苏州
英文
480-484
2007-09-13（万方平台首次上网日期，不代表论文的发表时间）