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Non-isothermal crystallization kinetics of modified polyvinyl alcohol
Author(s): 
Pages: 39-42,47
Year: Issue:  5
Journal: China Synthetic Fiber Industry

Keyword:  polyvinyl alcoholmodificationthermal analysisnon-isothermal crystallization kinetics;
Abstract: 通过差示扫描量热法(DSC)测定了己内酰胺水溶液改性的聚乙烯醇(PVA)降温结晶过程,并用Ozawa方法,Jeziomy方法和莫志深方法分析了改性PVA的非等温结晶动力学.结果表明:随着冷却速率增加,改性体系内起增塑作用的小分子由于其蒸发升华的减缓,改性PVA体系的运动能力增强,结晶度提高;莫志深方法能够较好地解释改性PVA的非等温结晶过程,即在单位时间内达到较大结晶度需较大的降温速率,且随着体系相对结晶度的增加,结晶速率降低.
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