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通过差示扫描量热法(DSC)测试了成核剂对可熔融加工改性聚乙烯醇(PVA)结晶行为的影响,并在DSC的基础上用Ozawa法、Jeziorny法以及莫志深方法分析了改性PVA以及改性PVA/成核剂两种材料的非等温结晶动力学。结果表明:结晶度、结晶峰温度、结晶半衰期、结晶速率对降温速率有很强的依赖性;随着降温速率的增加,结晶速率常数增大,结晶度提高;在相同的降温速率下,复合体系的结晶速率常数较大,即成核剂的加入使改性PVA的结晶速率增加,具有异相成核的作用;其中莫志深方法能够较好地解释改性PVA的非等温结晶过程。
The effect of nucleating agent on the crystallization behavior of melt-processable polyvinyl alcohol (PVA) was tested by differential scanning calorimetry (DSC) and analyzed by Ozawa method, Jeziorny method and Morozim method based on DSC Non-isothermal crystallization kinetics of both modified PVA and modified PVA / nucleating agent. The results show that the crystallinity, the crystallization temperature, the crystallization half-life and the crystallization rate have a strong dependence on the cooling rate. With the cooling rate increasing, the crystallization rate constant increases and the crystallinity increases. Under the same cooling rate, The crystallization rate constant of the system is larger, that is, the addition of nucleating agent increases the crystallization rate of the modified PVA and has the effect of heterogeneous nucleation. The method of non-isothermal crystallization of the modified PVA can be well explained by the method of Mozhishen.