端氨基聚氨酯接枝聚丙烯和聚丙烯共混物的结晶动力学研究

Study on the Crystallization Kinetics of PP-g-ATPU and PP/ PP-g-ATPU Blends

通过反应挤出的方法将端氨基聚氨酯接枝到聚丙烯上,提纯后产物的红外光谱上出现氨基甲酸酯的C=O和N-H的特征吸收峰。使用光学解偏振仪、DSC对改性聚丙烯进行结晶动力学的研究。结果表明等温结晶过程基本上符合Avrami方程,功能化基团的加入起到类似成核剂的作用,能够加快聚丙烯的结晶速率;用Mandelkern理论处理DSC非等温结晶数据,研究表明纯聚丙烯的结晶能力小于功能化聚丙烯,而且非等温结晶过程也较好地符合Mandelkern理论。

Grafting of amino-terminated polyurethane（ATPU） onto polypropylene（PP） was performed by reaction extrusion. The IR spectrum of pured PP- g-ATPU showed the characteristic bands of carbonyl group C=O and imine group N—H of urethane at 1 712 cm^-1 and 3 340 cm^-1 respectively. The crystallization kinetics of functional PP was studied by optical depolarization with a crystallization speedometer and differential scanning calorimeter （DSC） respectively. The result showed that the isothermal crystallization of PP and FPP could fit Avrami equation and the functional groups acted as nucleator in the crystallization and accelerated the crystallization . The noni-sothermal crystallization of PP and FPP also fitted Mandelkern theory.