【摘要】 通过DSC研究了支化和线性聚酰胺6的等温结晶行为,利用Avrami方程、Arrhenius理论描述了支化和线性聚酰胺6的等温结晶过程。结果表明:测得Avrami指数均在2～3之间;支化聚酰胺6的结晶活化能要小于线性聚酰胺6,支化聚酰胺6的结晶速率和结晶能力要比线性聚酰胺6低,说明赖氨酸支化单体的添加,破坏了聚合物分子链的规整性,增加了分子链间的缠结,影响链段结晶,在相同的结晶温度下熔体转化为晶体结构所需热能更多,更不易结晶;支化和线性聚酰胺6的力学性能差距不大,说明赖氨酸单体改性的支化聚酰胺6在注塑加工中材料力学性能并未发生显著损失。更多还原

【Abstract】 Isothermal crystallization behaviors of branched polyamide 6 and linear polyamide 6 were investigated by differential scanning calorimeter(DSC).The isothermal crystallization kinetics of branched polyamide 6 and linear polyamide 6 were analyzed by the Avrami equation, Arrhenius theories.The result showed that the calculated Avrami exponets were between 2 and 3.The crystallization activation energy of branched polyamide 6 was higher than that of linear polyamide 6,and the crystallization rate and crystallization ability of branched polyamide 6 were lower than that of linear polyamide 6,indicating that its overall regularity was damaged due to lysine as the branching monomer,and chain entanglement structure between molecule chains of polymer was increased, which affected the crystallisation.At the same crystallization temperature, more heat energy was needed to convert the melt structure into crystal structure, and it was more difficult to crystallize.The mechanical properties between branched polyamide 6 and linear polyamide 6 were not much different.The results showed that the mechanical properties of branched polyamide 6 modified by lysine monomer did not suffer significant loss in injection molding.更多还原