异相共聚PAN产物的性能对比及其流变研究

Performance comparison and rheology of PAN copolymer product by heterogeneous copolymerization

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 was a means to prepare high molecular weight polyacrylonitrile, however, both spinning effect varied greatly in the same process. Starting from the polymerization product properties, respectively, using the suspension polymerization and precipitation polymerization method to synthesize different molecular weight PAN copolymers. The molecular weight distribution of the polymer by two synthetic mechanism with GPC was determined. The particle morphology was observed by SEM,applying the fourth statistical mechanics sub-cluster theory of statistical parameters to study polymer particle size distribution and particle size uniformity, the spinning liquid viscosity under different solid content was determined by a rotational viscometer. The results showed that, precipitation polymerization product had a broader molecular weight distribution than suspension polymerization product, the suspension polymerization product had more uniform distribution of precipitate particle size of the polymerization product. Two mechanisms product under the copolymerization, the higher the molecular weight, the greater the viscosity of the spinning liquid, the higher the dissolution temperature,the smaller the viscosity of the spinning solution. When the solid content was 9%, the two polymerization products showed different rheological law.