丙烯酰胺-丙烯酸钠共聚物的键结构和光散射研究

用溶液聚合方法制备了一组单体含量相同、分子量不同的丙烯酰胺-丙烯酸钠(AM-AA)共聚物样品,用¹³CNMR和常规光散射方法进行了表征。该组样品的化学组成是均一的(AA摩尔含量16.9±1.1%),AA单体在大分子链中的序列分布为孤立、无规的,聚电解质在盐水体系中的光散射理论适用于共聚物在0.12mol/LNaCl水溶液体系。用恒化学位下的折光指数增量代替恒盐组成的折光指数增量,可从一次常规光散射实验分别求得共聚物样品的真实、第二维利系数A₂和均方旋转半径〈R²〉_z,其关系为:A₂=0.0619M_w^-0.21,〈R²〉_z^1/2=0.0210M_w^0.54.

The Chain Structure and Light Scattering Studies for Acrylamide-Sodium Acrylic Acid(AM-AA)Copolymers

Aset of AM-AAcopolymer samples with the same comonomer content and differ ent average molecular weight have been chracterized by ¹³CNMR and light scattering methods in this paper.The chemical composition(comonomer AA,mole content 16.9±1.1%)of these samples is uniform, the sequence of AA in the macromolecular chain is of alone and random distribution and the light scattering theory from polyelectrolyte in added-salt solutions is suitable for the AM-AA copolymers-0.12 mol/L NaCl water systems. The actual values of M_w,the second Virial coefficient A₂and the mean square radius of gyration〈R₂〉_zfor the studied samples have been obtained,The relationships between the molecular parameters are as follows:A₂=0.0619M_w^-0.21,〈R²〉_z^1/2=0.0210M_w^0.54.