黏弹性表面活性剂芥酰丙基二甲基羧基甜菜碱与水溶性聚丙烯酰胺的溶液拉伸流变行为对比  

A Comparative Study on Extensional Rheological Behaviors Between Viscoelastic Surfactant and Water-Soluble Polymer Solutions

作　　者：余率 陈昊[1] 王骥 殷鸿尧 韩一秀 冯玉军[1] Shuai Yu;Hao Chen;JiWang;Hongyao Yin;Yixiu Han;Yujun Feng(Polymer Research Institute,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China;New Theory and Technology of CO2 Capture Research Center,Tianfu Yongxing Laboratory,Chengdu 610065,China;Civil Aviation Administration of China,the Second Research Institute of CAAC,Chengdu 610065,China)

机构地区：[1]四川大学高分子研究所高分子材料国家重点实验室,四川成都610065 [2]天府永兴实验室二氧化碳捕集新原理与技术研究中心,四川成都610065 [3]中国民用航空局中国民航局第二研究所,四川成都610065

出　　处：《高分子材料科学与工程》2024年第10期80-88,共9页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(U22A20395,22172108)。

摘　　要：黏弹性表面活性剂常被称为“活聚合物”或“平衡聚合物”,但其与聚合物溶液在拉伸流变行为方面的异同却鲜见报道。文中利用自行搭建的液珠滴落平板(DoS)拉伸流变仪,对比研究了黏弹性表面活性剂芥酰丙基二甲基羧基甜菜碱(EDAB)与常用的水溶性聚合物——聚丙烯酰胺(PAM)的溶液拉伸流变行为。结果表明,PAM比EDAB溶液中的蠕虫状胶束具有更强的结构柔韧性,因此表现出更高的拉伸黏度和特殊的应变硬化行为。此外,相比于EDAB溶液,PAM溶液的拉伸流变行为对温度更为敏感,因为温度能加速PAM链段的解缠结过程。文中工作可加深对黏弹性表面活性剂在拉伸流场下的溶液行为的理解,为其合理利用提供参考。Viscoelastic surfactants(VES)are a class of surfactants that can form wormlike micelles in solution through self-assembly and exhibit viscoelasticity on a macroscopic level.Due to their strong viscosifying ability and reversible shear properties,viscoelastic surfactants are often called“living polymers”or“equilibrium polymers”.However,the similarities and differences in the extensional rheological behavior between VES and polymer solutions were rarely explored yet.In this work,through a homemade dripping onto substrate(DoS)extensional rheometer,the solution extensional rheological behaviors of a viscoelastic surfactant,erucic acid amidopropyl betaine(EDAB),and a commonly used water-soluble polymer,polyacrylamide(PAM),in 0.5 mol/L NaCl was compared.The results show that due to the stronger structural flexibility of PAM than the EDAB wormlike micelles,PAM exhibits higher extensional viscosity and unique strain hardening behavior.Compared to EDAB solution,the extensional rheological behavior of PAM solution is more sensitive to temperature because heating can accelerate the disentanglement process of PAM chains.This work deepens the understanding of the behavior of viscoelastic surfactant solutions under extensional flow fields and can provide guidance for their rational use.

关 键 词：黏弹性表面活性剂 水溶性聚合物 蠕虫状胶束 拉伸流变 冷冻透射电镜 

分 类 号：TQ423[化学工程]