几种极性增塑剂对淀粉/PVA混合浆相分离速度的影响

几种极性增塑剂对淀粉/PVA混合浆相分离速度的影响 Effect of Some Polar Plasticizers on the Phase-separation Rates of Polyvinyl Alcohol/Starch Pastes 祝志峰 ZHU Zhi-feng 1 first-author 武汉大学化学与分子科学学院,湖北,武汉,430072 武汉大学化学与分子科学学院,湖北,武汉,430072 College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072,Hubei,China) \ \ College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072,Hubei,China) \ \ 以初显分离时间为量化指标 ,选取丙三醇、尿素、1,2 -丙二醇及乙二醇四种淀粉和 PVA的常用增塑剂 ,定量研究了这些极性化合物对淀粉与 PVA- 1799及 PVA- 1788混合浆液相分离速度的影响 .结果发现这 4种极性化合物都能在一定程度上降低淀粉与 PVA- 1799混合浆液的相分离速度 ,尿素还具有提高淀粉与 PVA- 1788混合浆液稳定性的功能 .此外 ,本文还研究了丙三醇和尿素的用量、淀粉与 PVA的混合比例对混合浆液相分离速度的影响 . The influences of some polar plasticizers of starches and/or polyvinyl alcohol （PVA） upon the phase-separation rates of the blended starch/PVA pastes had been studied. The polar plasticizers such as glycerin, urea, 1,2-propanediol and ethylene glycol were individually mixed with the blended pastes. The separation rates were quantitatively evaluated by the initial demixing time of the blended pastes. It was found that all the polar substances studied here could reduce the separation rate of PVA-1799/native cornstarch pastes, whereas the rate of PVA-1788/native cornstarch paste could be only reduced by urea. Moreover, the influences of the amounts of glycerin and urea, and component content upon the separation rates were also investigated.\; 淀粉 聚乙烯醇 相分离 增塑剂 starch polyvinyl alcohol phase separation plasticizer TQ028 2001-02-01 2021-04-01 2