聚丙烯腈-衣康酸的DMF浓溶液流变性质研究

来源 :第七届博士生学术年会 | 被引量 : 0次 | 上传用户:type
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  研究了碳纤维前驱体丙烯腈-衣康酸共聚物(PAN-IA) /N,N-二甲基甲酰胺(DMF)溶液的流变学性质,聚合物的黏均分子量在4~10万之间,IA的质量含量约5%;考察了质量浓度在15%~30%、温度在30℃~90℃范围内溶液的流变性质。发现对数零切黏度与浓度、分子量及温度倒数存在良好的线性关系,而且在100 1/s以内的剪切速率下,溶液接近牛顿流体的行为,然而随黏度的升高而表现出剪切变稀行为。对比了DMF、DMSO(二甲基亚砜)、DMAc(N,N-二甲基乙酰胺)作为溶剂时溶液的流变特性,结果显示DMF的溶解能力最好,黏度最低。研究还表明,单体衣康酸的引入能改善PAN溶液的流变性质,降低溶液的黏度。
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