尼龙6/Kevlar纤维复合材料的非等温结晶行为及熔融特性

采用阴离子接枝法对K ev lar纤维(KF)进行表面改性,并用挤出方式分别制备尼龙6/未改性K ev lar纤维(PA 6/KF 0)及尼龙6/改性K ev lar纤维(PA 6/KF 1)复合材料。利用差示扫描量热仪(DSC)研究了KF 0和KF 1对PA 6/KF复合材料非等温结晶行为与熔融特性的影响,并与PA 6进行比较。结果表明,KF 0和KF 1起成核作用,提高了基体PA 6结晶的起始温度Tconset,减小其总结晶时间ttotal,同时提高了PA 6熔融时低温峰的相对强度,其中KF 1的效果更为明显;随着冷却速率β的加快,PA 6/KF 0和PA 6/KF 1复合材料中PA 6组分与纯PA 6一样,其Tocnset移向低温,且PA 6的熔融热谱由单重熔融峰向双重熔融行为转变。

STUDY ON THE NONISOTHERMAL CRYSTALLINE BEHAVIOR AND MELTING CHARACTERISTICS OF KEVLAR FIBER REINFORCED NYLON6 COMPOSITES

Kevlar fiber(KF) was modified by anionic grafting of nylon 6.The nylon6/raw Kevlar fiber composites(PA6/KF0) and nylon6/modified Kevlar fiber composites(PA6/KF1) were prepared by extrusion process.In the mean time,DSC was used to study the effect of KF0 and KF1 on the nonisothermal crystalline behavior and melting characteristics of PA6/KF composites.Both KF1 and KF0 improved the T~~c__(onset) of PA6,reduced its t_(total),enhanced the relative intensity of the lower temperature melting peak of PA6,which attributed to their nucleation.The nucleation effect of KF1 is more obvious than that of KF0.The T~~c__(onset) of all samples would fall when the cooling rate accelerated,at the same time,a single melting peak of PA6 would be instead of double melting peaks.