不同分子量丙烯腈－丙烯酰胺共聚物溶液的流变性研究

摘要: 将不同分子量的丙烯腈（AN）与丙烯酰胺（AM）的共聚物溶解于二甲基亚砜（DMSO）中，获得聚丙烯腈（PAN）溶液。采用旋转粘度计和锥板流变仪，从非牛顿指数n、流动活化能ΔΕη、结构粘度指数Δηa和弹性模量G等方面比较了不同分子量PAN溶液的流变性能。结果表明：分子量高的PAN溶液的表观粘度对应力变化敏感，分子量低的PAN溶液的表观粘度对温度的变化敏感。无论是从粘性还是从弹性角度看，低分子量PAN溶液的物理稳定性好。

Abstract: The rheological properties of poly(acrylonitrile-acrylamide) solutions with different molecular weights obtained by dissolving copolymers of acrylonitrile(AN) with acrylamide(AM) into dimethylsulfoxide (DMSO) were characterized by Non-Newtonian viscous index, activation energy of viscous flow, structure viscosity index and modulus. It is found that viscosities of the solutions with high molecular weight are more sensitive to shear rate and less sensitive to temperature than those with low molecular weight. The solutions with low molecular weight show better stability in repect of viscosity and elasticity than those with high molecular weight.