为了制备具有良好可牵伸性能的PAN初生纤维,利用XRD、纤维强伸度仪、SEM等手段,分析了纺丝液温度、凝固浴温度和喷丝速度对初生纤维结晶和力学性能的影响。结果表明降低纺丝液温度和凝固浴温度减弱了PAN初生纤维的结晶能力,其中凝固浴温度的作用效果更为明显,结晶度的下降有利于提高初生纤维的断裂伸长率,而不会造成断裂强度的降低。加快喷丝速度能促进PAN初生纤维成形过程中的拉伸变形,有效降低了初生纤维的纤度并提高了其可牵伸性能。
The influence of the formation conditions including spinning solution temperature,coagulation bath temperature and spinning speed on the crystallization and mechanical properties of PAN nascent fiber,were investigated by means of XRD,tensile test and SEM.The crystallizability was weaken by lowering spinning solution and coagulation bath temperature,which improved the draw-ability of the PAN nascent fiber simultaneously with little influence on its breaking strength.And the adjustment of the coagulation bath temperature played a more marked effect.Increasing spinning speed was propitious to the drawing deformation for PAN nascent fiber,which effectively downsized the fiber＇s fineness and comparatively improved its draw-ability.
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