论文部分内容阅读
异相聚合是制备高分子量聚丙烯腈的手段,然而相同工艺下两者纺丝效果差别很大。从聚合产品性能出发,分别利用悬浮聚合与沉淀聚合的方法合成不同分子量的PAN共聚物,并使用GPC仪测定两种合成机理下的PAN产物的分子量分布,利用SEM观察聚合物颗粒形貌,应用第四统计力学群子统计参数理论研究了聚合物的粒径分布与粒径均匀度,使用旋转黏度计测定不同固含量下的纺丝液黏度。结果表明,沉淀聚合产品较悬浮聚合产品有较宽的分子量分布,悬浮聚合产品较沉淀聚合产品的粒径分布更均匀;对于两种机理下的共聚产物,分子量越高,纺丝液黏度越大,溶解温度越高,纺丝液黏度越小;固含量为9%时,两种聚合产物表现出不同的流变规律。
Heterogeneous polymerization is the preparation of high molecular weight polyacrylonitrile means, however, the same process under both spinning effect varies widely. Starting from the properties of polymerization products, PAN copolymers with different molecular weights were synthesized by suspension polymerization and precipitation polymerization respectively. The molecular weight distributions of PAN products were measured by GPC. The morphology of polymer particles was observed by SEM. Fourth Statistical Mechanics subgroup statistical parameters of the polymer particle size distribution and particle size uniformity, the use of rotating viscometer Determination of different solids content of spinning solution viscosity. The results showed that the precipitation polymerization product has a wider molecular weight distribution than the suspension polymerization product, and the suspension polymer product is more uniform in particle size distribution than the precipitation polymerization product. For the copolymerization products under the two mechanisms, the higher the molecular weight, the greater the viscosity of the spinning solution , The higher the dissolution temperature, the smaller the viscosity of the spinning solution; when the solid content is 9%, the two polymerization products show different rheological rules.