为了提高聚丙烯腈（PAN）初生纤维的可拉伸性能,将溶液纺丝得到的初生纤维进行不同时间的恒温干燥处理,研究其拉伸性能随干燥时间的变化规律。结果表明,干燥处理可以大幅度提升PAN初生纤维的力学性能,其拉伸强力可达10.3cN,断裂伸长可达263.5%;随着干燥时间的延长,纤维的可拉伸性能增强,经过10h干燥后的初生纤维具有最佳可牵伸性能;而拉伸速率的提高可以有效促进未干燥初生纤维的拉伸变形,而对干燥处理后纤维的拉伸性能的影响不大。用SEM观察纤维断裂形貌发现,PAN纤维的致密性随牵伸比的增加而提高。
Polyacrylonitrile （PAN） nacent fibers fabricated by solution spinning were thermostatically dried for different time in order to improve their tensile property. Tensile test was performed to obtain the relationship between the tensile property and the drying time, which showed an optimum break force at 10.3oN and breaking elongation at 263. 5%. Fiber dried for 10h was most appropriate for drawing as it possessed both high breaking elongation and low yield platform. Accelerating drawing speed availably promoted the tensile property for un-dried PAN nascent fiber, which only had a small effect on dried fiber. And then the fracture morphology of the fibers was characterized with SEM, the results of which demonstrated that increasing drawing ratio was able to help promote compactness of fiber.
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