不同分子质量ETFE的非等温结晶动力学研究

Non- Isothermal Crystallization Behavior of Ethylene- Tetrafluoroethylene Copolymer with Different Weight- Average Molecular Weight

采用差示扫描量热仪对乙烯-四氟乙烯共聚物(ETFE)进行了分析,利用经验公式求出了样品的重均分子质量,并用莫志深法和Kissinger法研究了其非等温结晶动力学过程。结果显示所选3批树脂的重均分子质量分别为1.72×106g/mol、7.46×105g/mol和3.14×105g/mol;莫志深法和Kissinger法适用于ETFE的非等温结晶动力学分析,得到了分子质量和相关结晶参数之间的关系,经计算,3批样品的结晶扩散活化能分别为512.43 k J/mol、698.50 k J/mol和1 079.01 k J/mol。

Ethylene- Tetrafluoroethylene copolymer（ ETFE） was studied by DSC,weight- average molecular weight of samples were calculated by the empirical formula,DSC data was analyzed with Mo and Kissinger method.Results indicated that weight- average molecular weight of samples were 1. 72 × 10^6,7. 46 × 10^5 and 3. 14 × 10^5 g /mol,respectively; The Mo and Kissinger method could describe the non- isothermal crystallization process of ETFE very well,and the relationships between the weight- average molecular weight and the parameters were calculated; the crystalline diffusion activation energies of samples were 512. 43,698. 50 and 1 079. 01 k J / mol.