连续聚合制备聚丙烯腈原丝强度与聚合控制温度的相关性

Relationship Between Mechanical Properties of the PAN Fiber and Polymerization Temperature by Continuous Polymerization

在采用连续聚合工艺方式进行聚丙烯腈(PAN)原丝工程化生产时,聚合过程的控制工艺与原丝的性能有着直接的联系。主要研究了在以丙烯腈(AN)、衣康酸(IA)和2-丙烯酸胺基-2-甲基丙磺酸(AS)为共聚单体的三元共聚体系,通过一套三釜串联的装置采用连续聚合的方式制备PAN的工艺路线中,反应温度这一主要聚合控制工艺与PAN原丝强度的相关性联系。结果表明:聚合反应温度可直接影响到纺丝液的特性黏度、增比黏度,进一步影响纺丝后得到的原丝的结构及性能;随着聚合反应温度的逐步降低,纺丝液的增比黏度逐渐上升,而对应原丝的强度呈现先增加后降低的趋势,当反应温度降至61℃时,原丝的强度达到本实验的最大值(6.8 cN/dtex)。

There was a direct link between the control technology of the polymerization process and the performance of the virgin carbon fiber by using a continuous polymerization process to produce PAN fiber in the engineering production.In this way a series arrangement of three reactors in continuous polymerization process for preparing the PAN was studied.The reaction temperature was a main polymerization factor in the terpolymer system with the acrylonitrile （AN）,itaconic acid （IA） and 2-Acrylic amino-2-methyl propane sulfonic acid （AS） as co-monomers between the monofilament mechanical properties of the PAN fiber.The results showed that polymerization temperature can directly affect the intrinsic viscosity and the specific viscosity of the spinning solution,which further affect the structure and properties of the fiber obtained by spinning.With the polymerization temperature decreased gradually,the specific viscosity of the spinning solution increased gradually,while the fiber strength had increased and then decreased.When the reaction temperature was low to a certain temperature,the spinning solution viscosity had increased rapidly,which resulted a deterioration of the spinning process and affected the normal engineering production.