低纤度聚酰胺6长丝的结构与性能

Research of Structure and Performance of Low-Denier Polyamide 6 Filament

借助X射线衍射及差示扫描量热技术,研究并分析了不同拉伸热定形工艺条件下低纤度聚酰胺6纤维的结晶取向的变化及对纤维力学性能的影响。结果表明:总拉伸倍数不变的情况下,适当提高牵伸辊的拉伸倍数更能有效地提高纤维强度;在一定温度范围内,适当提高热定形温度有利于改善晶区结构,但对纤维的取向度影响不明显,当热定形温度高于175℃时,纤维断裂强度出现下降;保持拉伸倍数及热定形温度不变,改变纺丝速度,纤维结构和力学性能的变化不显著。

The crystallization and orientation changes of low-denier polyamide 6 filament were studied on the condition of different draw ratios and heat setting temperatures by means of X-ray diffraction（XRD） and differential scanning calorimetric（DSC） technique as well as their influences on the mechanical performance of polyamide 6 fibers. Results showed that, under the condition of invariable total draw ratio, increasing the draw ratio of drafting roller could improve the fiber strength more effectively, in a certain temperature range, increasing the heat setting temperature appropriately could improve the crystalline structure in some way, whereas no obvious effects on fiber orientation degree, fiber strength decreased when heat setting temperature was higher than 175 ℃, maintaining the same draw ratio and heat setting temper- ature while changing the spinning speed had little influence on the structure and performance of polyamide 6 fiber.