新型长碳链聚酰胺1211的非等温结晶动力学

Nonisothermal crystallization kinetics of novel long-carbon chain polyamide 1211

针对聚合物力学性能受微观晶型结构影响的问题,采用一步聚合法制备了聚酰胺1211,通过调节聚酰胺1211的微观晶型结构来调控其力学性能。借助差示扫描量热仪对聚酰胺1211进行非等温结晶研究,表征其在非等温情况下晶型变化方式,分别用Jeziorny法和莫志深法修正的Avrami方程分析聚酰胺1211的非等温结晶行为。结果表明:通过Jeziorny法修正后的Avrami方程处理时,其非等温结晶过程由2个阶段组成,在主结晶期阶段Avrami指数为2.51～3.22,晶体为二维盘状方式生长,在次结晶期阶段指数为0.99～2.14,晶体为一维纤维状方式生长;用莫志深法修正的Avrami方程得到冷却速率值为14.91～37.57;利用Kissinger方法求得聚酰胺1211非等温结晶的结晶活化能为-115 kJ/mol。

Aiming at the problems that the mechanical properties of polymer were influenced by the microcrystalline structure,polyamide 1211 was prepared by one-step polymerization,and the mechanical properties of polyamide 1211 were controlled by controlling the microcrystalline structure thereof.The nonisothermal crystallization of polyamide 1211 was studied by differential scanning calorimeter.Nonisothermal crystallization kinetics of polyamide 1211 was studied using the Avrami equations modified by Jeziorny method and Mo method.The results obtained by Jeziorny method exhibit that the nonisothermal crystallization kinetics of polyamide 1211 comprises two stages.The Avrami index is ranged from 2.51 to 3.22 during the main crystallization stage process,and the crystal grows in a two-dimensional disk state.In the sub crystallization stage process,the Avrami index is 0.99-2.14,and the crystal grows in a one-dimensional fiber state.The cooling rate value is 14.91-37.57.In addition,the activation energy of nonisothermal crystallization for polyamide 1211 acquired by Kissinger method is-115 kJ/mol.