凝固条件对PAN初生纤维微孔结构形态的影响

采用一维多取向小角X射线散射研究了聚丙烯腈细流在凝固过程中,凝固浴温度、浓度以及喷丝头拉伸比对初生纤维中微孔结构形态的影响。结果表明,凝固温度由30％提高到60℃时,微孔沿纤维轴取向增强,微孔尺寸减小,但微孔数量增加;凝固浴质量分数由67．5％升高到76．0％,微孔数量减少,但微孔尺寸变大,微孔沿纤维轴取向减弱;喷丝头拉伸比为-36．7％-10％时,微孔尺寸和取向角都增大。在凝固浴温度为52-55℃,凝固浴质量分数为70％,选择负拉伸能得到性能优异的初生纤维。

Effect of coagulation conditions on microcellular structural morphology of as-spun PAN fiber

The effects of coagulation temperature and concentration and draw down ratio on the microcellular structural morphology of as-spun PAN fiber were studied during coagulation process by small angle X-ray scattering. The result showed that the axial orientation of microcellular structure was enhanced, the dimension of the microcellulae was decreased, but the number was increased when the coagulation temperature was increased from 30℃ to 60℃ ; And the axial orientation of microcellular structure was weakened, the number of the microcellulae was decreased, but the dimension was increased when the coagulation bath mass fraction was raised from 67. 5％ to 76. 0％ . Both the microcellular dimension and the orientation angle were increased when the draw down ratio was elevated from - 36.7％ to 10％ . The as-spun PAN fiber can be produced with splendid properties under the conditions of coagulation temperature 52 -55℃ , coagulation bath mass fraction 70％ and negative stretch process.