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不同溶剂对聚乙烯醇溶液体系流变行为的影响

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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.
Influence of different solvents on rheological behavior of polyvinyl alcohol solution system
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.

polyvinyl alcoholdimethyl sulfoxidesolution systemrheological behavior

黎园、张素眉、陈金耀

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中国石化集团重庆川维化工有限公司,重庆 401254

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

聚乙烯醇 二甲基亚砜 溶液体系 流变行为

2024

合成纤维工业
中国石化集团巴陵石油化工有限责任公司 中国石化集团公司合成纤维科技情报中心站

合成纤维工业

CSTPCD
影响因子:0.417
ISSN:1001-0041
年,卷(期):2024.47(2)
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