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以热力学相图为工具,探讨了聚丙烯睛(PAN)原丝凝固成形过程。从相图中原丝凝固成形的不同途径和相应的织态结构可以知道,原液体系以旋节方式分相是最佳的热力学路径。原丝凝固成形可以看作是浓度致变相分离(CIPS)和热致变相分离(TIPS)两种相分离形式的组合,通过后者得到高性能原丝要容易实现得多。可以根据相图来优化纺丝工艺条件,通过调节凝固浴浓度、纺丝液浓度、初始纺丝温度以及淬火深度.削弱CIPS过程在凝固成形中的作用,使凝固成彤尽可能多的以TIPS方式通过旋节线和双节线的交界处进行,以得到具有理想结构的优质的PAN原丝。
Using thermodynamic phase diagram as a tool, the process of coagulation of PAN filaments was discussed. From the phase diagram of the solidification of the original wire forming different ways and the corresponding weave structure can know that the original system of liquid spinodal phase separation is the best thermodynamic path. The solidification of raw filaments can be seen as a combination of two forms of phase separation, concentration induced phase separation (CIPS) and thermotropic phase separation (TIPS), through which the high performance precursor is much easier to achieve. The spinning process conditions can be optimized according to the phase diagram by adjusting the coagulation bath concentration, spinning solution concentration, initial spinning temperature, and quench depth, weakening the role of the CIPS process in the setting process, allowing the solidification to occur as much as possible with TIPS The method is performed by the junction of spinodal and double knot to obtain a good quality PAN yarn with an ideal structure.