摘要
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：
A set of AM-AA copolymer samples with the same comonomer content and differ ent average molecular weight have been chracterized by 13C NMR 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 Mw,the second Virial coefficient A2 and the mean square radius of gyration〈R2〉z for the studied samples have been obtained,The relationships between the molecular parameters are as follows:A2=0.0619,〈R2〉z1/2=0.0210.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第4期639-642,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
丙烯酰胺
共聚物
NMR
光散射
键结构
Water soluble polymer
Acrylamide copolymer
￣(13)C NMR
Light scattering
