非晶高聚物对聚(ε-己内酯)在其与苯乙烯-丙烯腈共聚物相容共混物中球晶生长速率的影响

THE INFLUENCE OF NONCRYSTALLIZABLE POLYMER ON THE CRYSTALLIZATION KINETICS OF POLY (ε-CAPRO- LACTONE) IN ITS COMPATIBLE MIXTURES WITH POLY (STYRENE-CO-ACRYLONIOTRILE)

本文研究了聚(ε-己内酯)(PCL)在其与苯乙烯-丙烯腈共聚物(SAN)的相容共混物中球晶生长速率与共混组成和结晶温度的关系.发现聚己内酯的球晶生长速率随着SAN的含量增加而下降.由于PCL与SAN是相容共混物,因此在用二次成核动力学方程描述PCL球晶生长速率时,我们引进了相互作用参数X.结果由共混体系的结晶动力学方程计算到的X值与由平衡熔点下降方法计算到的X_(23)值是相同的;而PCL晶体的折叠表面自由能则随着SAN含量的增加而下降.这些结果说明非晶高聚物SAN有碍于PCL球晶的生长.

The crystallization kinetics in mixtures of poly (ε-caprolactone) (PCL) and poly(styrene-co-acrylonitrile)(SAN) has been investigated as a function of composition and crystallization temperature. The isothermal growth rates of PCL spherulites decrease with increasing concentration of SAN. The radial growth rates of the spherulites were described by the kinetic equation including the interaction parameter, because of miscible mixtures of PCL/SAN. The interaction parameter obtained from the fitting of kinetic equation with experimental data is in good agreement with that obtained from melting point depression method. The folding surface free energies σc decrease with the increase of SAN content. In light of these results, it is suggested that, for these mixtures, the noncrystallizable polymer SAN reduces the mobility of crystallizable polymer PCL.