Kevlar纤维表面改性对PA6／Kevlar纤维复合材料非等温结晶与熔融行为的影响

用差示扫描量热法(DSC)研究了尼龙6(PA6)及Kevlar纤维(KF)表面改性对PA6/KF非等温结晶与熔融行为的影响.非等温结晶结果表明,KF起到成核作用,提高了基体PA6的起始结晶温度TConset和总结晶时间ttotaa,但是改性后的KF1(经己二酰氯处理,己内酰胺稳定化并阴离子接枝尼龙6的KF)的成核作用不如未改性的KF0(未改性KF)显著;非等温结晶的熔融行为表明,KF的引入使得低温峰的熔融温度和相对强度都比纯PA6的高,KF起到了成核作用,使得结晶的完善程度提高.

Study on the Behavior of Non-Isothermal Crystallization and Melting of the Modificated PA6/Kevlar Fiber Composites

Differential scanning calorimetry was used to investigate the effect of polymide6(PA6) grafted Kevlar fiber on the non-isothermal crystallization behavior of PA6/Kevlar fiber composites.The results showed that the non-isothermal crystollization of PA6 was dominated by nucleation while the un-grafted Kevlar fiber played an role of heteregeneous nucleation agent in the process of crystallization of PA6 and increased its T~c_(onset) and t_(total).The PA6 grafted Kevlar fiber still played the role of heteregeneous nucleation agent in the PA6/Kevlar fiber composites,however,its effect was less than that of the ungrafted Kevlar fiber.This may be ascribed to the improved interfacial adhesion between PA6 and Kevlar fiber in the composites where the movement of PA6 segments are inhibitted.The melting bahavior showed that the join of Kevlar fiber made the temperature and intensity of low-temperature melting peak improved.Kevlar fiber also improved the integration degree of crystal.