半芳香尼龙6T/66的合成和非等温结晶动力学的研究

采用成盐、预聚合、固相聚合三步法制备高分子量的PA6T/66,用差示扫描量热法(DSC)研究了PA6T/66的非等温结晶动力学,结果表明:结晶温度随着降温速率的增大而降低;半结晶期T1/2随降温速率Ф的增大呈指数下降,表明结晶速率随降温速率的增大而提高;由用R-T法可以得到在不同结晶度下lgΦ对lgT有较好的线性关系。用Kissinger方法计算得到PA6T/66(55/45)非等温结晶活化能分别为ΔE=-61.51kJ/mol。

Synthesis and Non-isothermal Crystsllization Kinetics of Semi-aromatic Nylon 6T/66

PA6T/66 was synthesized via a three-step procedure as follows: preparation of PA6T salt and PA66 salt, preparation of PA6T/66 prepolymer and preparation of PA6T/66. Nonisothermal crystallization kinetics of semi-aromatic nylons were investigated by differential scanning calorimetry(DSC). The results showed that the crystallization temperature(Tc) decreases with decreasing of DSC scanning temperature;half-crystallization time, t1/2, decreases by exponentially with the increase of cooling rate Ф and thus the crystallization rate was enhanced with the increasing of cooling rate;lgΦ mapping of lgT have a better linear relationship under different degree of crystallinity by R-T method;the activation energies of PA6T/66(55/45) is ΔE＝-61.51 kJ/mol, which were calculated using the Kissinger method in the non-isothermal crystallization processes.