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十二烷基硫酸钠对聚乙烯醇亚浓水溶液流变行为的影响
Effect of Sodium Dodecyl Sulfate on the Rheological Behavior of Poly(vinyl alcohol) Aqueous Solution
- 高分子学报 2020年51卷第4期 页码：403-410
- 作者机构：
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
- 作者简介：
E-mail: dumiao@zju.edu.cn
- 基金信息：国家自然科学基金(基金号51673172，51873180)资助项目
DOI：10.11777/j.issn1000-3304.2019.19178
中图分类号：纸质出版日期：2020-4，
网络出版日期：2019-12-16，
收稿日期：2019-9-29，
修回日期：2019-11-11，
扫 描 看 全 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.
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.
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.
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.
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.
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.
关键词
聚乙烯醇十二烷基硫酸钠氢键流变行为
Keywords
Poly(vinyl alcohol)Sodium lauryl sulfateHydrogen bondRheological behavior
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