不同溶剂对聚乙烯醇溶液体系流变行为的影响
Influence of different solvents on rheological behavior of polyvinyl alcohol solution system
黎园 1张素眉 2陈金耀2
作者信息
- 1. 中国石化集团重庆川维化工有限公司,重庆 401254
- 2. 四川大学 高分子研究所,高分子材料工程国家重点实验室,四川 成都 610065
- 折叠
摘要
分别以水和二甲基亚砜(DMSO)为溶剂,采用旋转流变仪测试了不同聚乙烯醇(PVA)含量的PVA水溶液和PVA/DMSO溶液体系的流变行为,研究了PVA含量、温度及溶剂对高聚合度、高醇解度PVA溶液体系流变性能的影响.结果表明:随着剪切速率的增加,PVA水溶液和PVA/DMSO溶液的表观黏度(ηa)下降,呈现假塑性流体的行为;随着PVA含量的增加,PVA水溶液和PVA/DMSO溶液的ηa 急剧增加,体系的储能模量(G')和损耗模量(G″)也随之增大,两种溶液体系的黏弹性行为增强;与PVA水溶液体系相比,PVA在DMSO中的溶解度更高,PVA分子流体力学体积更大;在相同的PVA含量下,PVA/DMSO溶液体系的ηa、G'和G″均高于PVA水溶液体系;升高温度可促使PVA链段运动能力增强,抵消一部分剪切作用对PVA溶液体系流变性能的影响.
Abstract
The rheological behavior of polyvinyl alcohol(PVA)aqueous solution and PVA/dimethyl sulfoxide(DMSO)solu-tion systems with different PVA content was tested with water and DMSO as solvents using a rotary rheometer.The effects of PVA content,temperature and solvents on the rheological behavior of PVA solution systems with high degree of polymerization and al-coholysis were studied.The results showed that the apparent viscosity(ηa)of PVA aqueous solution and PVA/DMSO solution sharply decreased with the increase of shear rate,which exhibited pseudoplastic fluid behavior;the ηa of PVA aqueous solution and PVA/DMSO solution sharply increased,the storage modulus(G')and loss modulus(G″)also increased,and the viscoelas-tic behavior was enhanced with the increase of PVA content;compared with PVA aqueous solution system,PVA had a higher solubility and a larger molecular fluid dynamics volume in DMSO;PVA/DMSO solution system had ηa,G' and G″ higher than PVA aqueous solution system at the same PVA content;and the temperature elevation can enhance the PVA segment mobility,offsetting some of the shear effects on the rheological behavior of PVA solution systems.
关键词
聚乙烯醇/二甲基亚砜/溶液体系/流变行为Key words
polyvinyl alcohol/dimethyl sulfoxide/solution system/rheological behavior引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据