用差示扫描量热法研究聚偏氟乙烯(PVDF)在“PVDF/聚酯(PET)/稀释剂”体系中的非等温结晶行为，分析 PET 对 PVDF 结晶的影响，分别用 Ozawa、Jeziorny 和 Mo 法对 PVDF 非等温结晶过程的数据进行拟合，得到 PVDF 在“PVDF/PET/稀释剂”体系中的非等温结晶动力学模型。结果表明， PVDF结晶焓随淬冷速率或 PET 含量的增加先增大后减小，结晶温度随淬冷速率的增加或PET含量的降低而降低。Ozawa 法在一定程度上可描述 PVDF 在“PVDF/稀释剂”体系中的非等温结晶过程，但不能很好地描述其在“PVDF/PET/稀释剂”体系中的非等温结晶过程；Jeziorny法结果表明 PVDF存在二次结晶；Mo 法较好地描述 PVDF 的初级非等温结晶过程， PVDF结晶受PET 异相成核影响明显。PET 的加入改变PVDF结晶行为，提高了膜的力学性能、孔隙率以及纯水通量。
Differential scanning calorimetry measurement was used to investigate the nonisothermal crystalliza-tion behavior of PVDF in a PVDF/PET/DEDB/DBP system.The effect of PET on the PVDF crystallization was analyzed.Ozawa,Jeziorny and Mo method were used to analysis the data of nonispthermal crystallization process of PVDF in order to set nonisothermal crystallization kinetic models of PVDF in a PVDF/PET/DEDB/DBP system.It was found that with the increase of cooling rate or PET/PVDF weight ratio,crystalline enthalpy increased firstly and then decreased.But the exothermic peak temperature of crystallization shifted to lower temperature.Ozawa model cannot well describe nonisothermal crystallization behavior of PVDF crystallization. In the Jeziorny analysis,second crystallization of PVDF can be found.The Mo approach well explained PVDF initial crystallization behavior.PVDF crystallization was influenced by PET content and heterogeneous nuclea-ting was obvious.The addition of PET changed crystallization behavior,increased mechanical properties,poros-ity and pure water flux.
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