Simulation of dry‐spinning process of polyimide fibers
Simulation of dry‐spinning process of polyimide fibers
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DOI：
10.1002/app.30236
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发表时间：
2009-09
影响因子：
3
通讯作者：
G. Deng;Qingming Xia;Yuan Xu;Qinghua Zhang
中科院分区：
文献类型：
--
作者：
G. Deng;Qingming Xia;Yuan Xu;Qinghua Zhang
聚酰亚胺纤维是一种高性能纤维，以前驱体聚酰亚胺酸为原料，采用干法纺丝可制得聚酰亚胺纤维。与醋酸纤维素纤维或聚氨酯纤维的干法纺丝工艺不同，纺丝中前驱体在高温下发生热环化反应，导致干法纺丝过程相对复杂。但由于纺丝过程中存在轻微的聚酰亚胺到聚酰亚胺的亚酰化反应，因此认为纺丝过程为稳态，因此采用基于White-Metzer粘弹性本构方程的一维模型来模拟纤维的形成。预测了溶剂质量分数、温度、轴向速度、拉伸应力、亚胺化程度和纤维沿纺丝线玻璃化温度的变化。讨论了纺丝参数对玻璃化转变温度和亚胺化程度的影响。©2009 Wiley期刊公司高分子学报，2009
As one type of high-performance fibers, the polyimide fibers can be prepared from the precursor polyamic acid via dry-spinning technology. Unlike the dry-spinning process of cellulose acetate fiber or polyurethane fiber, thermal cyclization reaction of the precursor in spinline with high temperature results in the relative complex in the dry-spinning process. However, the spinning process is considered as a steady state due to a slight degree of the imidization reaction from polyamic acid to polyimide, and therefore a one-dimensional model based on White-Metzer viscoelastic constitutive equation is adopted to simulate the formation of the fibers. The changes of solvent mass fraction, temperature, axial velocity, tensile stress, imidization degree, and glass transition temperature of the filament along the spinline were predicted. The effects of spinning parameters on glass transition temperature and imidization degree were thus discussed. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009