In order to improve the properties of polyacrylonitrile (PAN) and obtain excellent PAN precursor fibers,high relative molecular weight PAN prepared by 60Co gamma ray irradiation polymerization was subjected to vacuum freeze-drying,blast drying,and vacuum drying,respectively.The samples were characterized by Fourier transform infrared spectroscopy,X-ray diffraction,scanning electron microscopy,and thermogravimetric analysis.The results indicated that vacuum drying could affect the chemical structure of PAN,increasing the temperature reduced the crystallization ability of PAN,and vacuum drying and blast drying caused aggregation or cross-linking of PAN.The thermal decomposition performance of PAN powder obtained through vacuum freeze-drying was the most stable,and the solubility performance was also the best.Therefore,vacuum freeze-drying was the best drying method.
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基金资助
江苏省自然科学基金青年基金项目(BK090925);江苏省重点研发计划项目(BE2021025);南通市社会民生科技项目(MS12020050);江苏省研究生科研与实践创新计划项目(SJCX21＿1451)
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