十二烷基硫酸钠对聚乙烯醇亚浓水溶液流变行为的影响

引用本文: 徐绍深, 杜淼, 宋义虎, 吴子良, 郑强. 十二烷基硫酸钠对聚乙烯醇亚浓水溶液流变行为的影响[J]. 高分子学报, 2020, 51(4): 403-410. doi: 10.11777/j.issn1000-3304.2019.19178 shu

Citation: Shao-shen Xu, Miao Du, Yi-hu Song, Zi-liang Wu, Qiang Zheng. Effect of Sodium Dodecyl Sulfate on the Rheological Behavior of Poly(vinyl alcohol) Aqueous Solution[J]. Acta Polymerica Sinica, 2020, 51(4): 403-410. doi: 10.11777/j.issn1000-3304.2019.19178 shu

十二烷基硫酸钠对聚乙烯醇亚浓水溶液流变行为的影响

高分子合成与功能构造教育部重点实验室浙江大学高分子科学与工程学系　杭州 310027

通讯作者: E-mail: dumiao@zju.edu.cn

摘要: 表面活性剂会影响聚乙烯醇(PVA)分子间及分子内氢键形成，进而改变其水溶液的流变响应. 本文在确定十二烷基硫酸钠(SDS)在PVA亚浓水溶液中的临界聚集浓度(CAC)和临界胶束浓度(CMC_P)基础上，考察了SDS对PVA亚浓溶液(10 wt%)流变行为的影响. 研究发现，不同浓度SDS (c_sur)对PVA水溶液稳态流变行为的影响差异较大: (1) 当c_sur < CAC，随着c_sur增加，复合溶液的表观黏度(η_a)变化不大；(2) 当CAC < c_sur < CMC_P，η_a随c_sur增加而下降，c_sur = CMC_P时，η_a最低，且该区域内显示较宽的第二平台；(3) 当c_sur > CMC_P，随着c_sur增加，胶束起物理交联点作用，η_a增大，复合溶液的动态储能模量亦显著增大. 加入SDS后，PVA体系内结合水的数目降低，但当c_sur > CMC后，结合水的数目几乎不变，黏流活化能也表现出相近的变化规律. 与稀溶液相比，SDS对PVA亚浓溶液的降黏幅度较大.

关键词:

English

Effect of Sodium Dodecyl Sulfate on the Rheological Behavior of Poly(vinyl alcohol) Aqueous Solution

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027

Corresponding author: Miao Du, dumiao@zju.edu.cn

Received Date: 29 September 2019
Revised Date: 11 November 2019
Available Online: 01 April 2020

Abstract: Rheological behaviors of poly(vinyl alcohol) (PVA) aqueous solution are influenced remarkably by the intermolecular hydrogen bond interaction in the semi-dilute solution region. Owing to the hydrogen bond network, 10 wt% PVA aqueous solution exhibits a high viscosity which limits the development of its solution processing method to some extent. Sodium dodecyl sulfate (SDS), as a surfactant, can destroy the hydrogen bond interaction, thus playing a certain viscosity-reducing role. Based on measuring the critical aggregation concentration (CAC) and critical micelle concentration of SDS in 10 wt% PVA aqueous solution (CMC_P), the steady and dynamic rheological behaviors of PVA-SDS aqueous solution were studied in detail. The concentrations of SDS (c_sur) can influence the rheological behavior of PVA aqueous solution in different ways at various regions. ① c_sur < CAC, the apparent viscosity (η_a) of the solution doesn’t change a lot as the c_sur changes. ② CAC < c_sur < CMC_P, η_a decreases as the c_sur increases. Particularly, η_a reaches the minimum while c_sur = CMC_P and a wider second platform is displayed in this area. ③ c_sur > CMC_P, SDS form micelles that act as physical cross-linking points, and the dynamic storage modulus (G′) of the composite solution also increases significantly. The changes in the hydrogen bond network of the PVA solution was indirectly characterized by the changes of the hydration number measured by Differential Scanning Calorimeter. After introducing SDS, the number of bound water (n) decreases due to the interaction between SDS and PVA. However, n almost keeps constant when c_sur > CMC_P. The viscous activation energy also shows a similar change. When c_sur is much larger, the micelles formed by SDS in water are conducive to the formation of physical cross-linking network, which contribute more to the solution elasticity, leading to the increase of G′ (greater than that of dynamic loss modulus). Compared with the dilute solution, SDS has a greater viscosity reduction effect on the PVA semi-dilute solution.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

十二烷基硫酸钠对聚乙烯醇亚浓水溶液流变行为的影响

通讯作者: E-mail: dumiao@zju.edu.cn

English

Effect of Sodium Dodecyl Sulfate on the Rheological Behavior of Poly(vinyl alcohol) Aqueous Solution

Corresponding author: Miao Du, dumiao@zju.edu.cn

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

十二烷基硫酸钠对聚乙烯醇亚浓水溶液流变行为的影响

通讯作者: E-mail: dumiao@zju.edu.cn

English

Effect of Sodium Dodecyl Sulfate on the Rheological Behavior of Poly(vinyl alcohol) Aqueous Solution

Corresponding author: Miao Du, dumiao@zju.edu.cn

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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