【摘要】 通过干喷湿纺纺丝工艺制得聚丙烯腈(PAN)初生纤维,采用不同的干燥方法获得PAN初生纤维干燥样品,考察对比自然晾干、鼓风干燥和冷冻干燥3种方法分别对样品物理特征、表面形貌和内部结构的影响。3种干燥方法均会使初生纤维样品发生收缩,样品截面积和长度均减小,但是变化程度不同。并且3种干燥方法对PAN初生纤维表面形貌、结晶特征、二甲基亚砜(DMSO)残留量以及孔结构产生不同的影响。结果表明冷冻干燥对PAN初生纤维的影响最小,可以有效的保留PAN初生纤维的原始结构,可用于制备聚丙烯腈初生纤维干燥样品。更多还原

【Abstract】 Polyacrylonitrile(PAN)-spun fibers are obtained by dry jet wet spinning process,different drying methods are used to obtain PAN nascent fibers dried samples.Then studied the effect on physical characteristics,surface morphology and internal structure of three methods by contrasting natural drying,air forced drying and freeze-drying.Three methods all caused shrinkage on the nascent fiber samples,cross-sectional area and length of samples were reduced,but with different degree of change.And three drying methods have different effects on the morphology of the surface of the nascent fiber PAN,crystallization characteristics,the amount of residual dimethylsulfoxide(DMSO),and pore structure.The results show that the impact of freeze drying on PAN nascent fibers are minimum,and it can effectively preserve the original structure of PAN nascent fibers spun fibers,so it can be used for sample preparation for testing.更多还原