采用光学显微镜和紫外可见分光光度计研究了聚丙烯腈(PAN)纤维的溶胀、溶解过程,采用旋转流变仪和激光粒度仪研究了不同组成PAN溶液的流变特性及对PAN溶液相转变的影响。结果表明:增大与溶剂的接触面积和延长时间,有利于PAN废丝的溶胀、溶解;PAN含量越多,大分子缠结作用力越大,分子间相互作用越强烈,PAN溶液的复数黏度、储能模量和损耗模量越大,在沉淀剂水中形成较大和较多的聚合物颗粒;可以用PAN废丝制备用于碳纤维原丝用的纺丝溶液。
The swelling and dissolution of polyacrylonitrile (PAN) fibers were studied by optical microscopy and ultraviolet-visible spectrophotometer.The rheological properties of PAN solutions with different compositions and their effects on the phase transition of PAN solutions were studied by rheometer and laser particle size analyzer.The results shown that increasing the contact area and prolonging time was beneficial to swelling and dissolution of waste PAN fiber.The more PAN content was,the greater the entanglement force of macromolecules,the stronger the intermolecular interaction.The greater the complex viscosity,storage modulus and loss modulus of PAN solution,the larger and more polymer particles will form in precipitating water.The waste PAN fiber was used to prepare spinning solution for carbon fiber precursor.
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