疏水缔合聚丙烯酸与蠕虫状胶束的协同作用.pdf

物理化学学报( Wuli Huarue Xuebao)
Acta Phys.-Chim.Sin.2012,28(7),1751-1756
1751
[Article]
doi:10.3866/PKU.WHXB201204233
www.whxb.pku.edu.cn
疏水缔合聚丙烯酸与蠕虫状胶東的协同作用
梅拥军2韩一秀2周洪2姚林1江波
(四川大学化学学院,成都610065;2中国民航局第二研究所,成都610041)
摘要:从宏观流变性和介观尺度方面,研究了疏水缩合聚丙烯酸(HMPA)与油酸(?aOA)构筑的蠕虫状胶束
的协同作用.考察HMPA对蠕虫状胶朿溶液流变性和表观粘度的影响,结果表明,极少量HMPA的引入导致蠕
虫状胶束溶液体系动态模量明显增加;其表观粘度随HMPA浓度的增加先增强后减弱.另一方面,通过耗散颗
粒动力学(DPD)分子模拟方法研究了混合体系中溶液组成对HMPA分子链的均方根末端距的影响.结果表明
随着NaOA浓度增加,HMPA的均方根末谎距会出现峰值;HMPA的伸展程度受其自身浓度变化制约,相对于
纯HMPA体系,NaOA胶束的存在对高浓度区的HMPA伸展程度影响更明显.结合流变实验和分子模拟结果,
初步解释了聚合物与蠕虫状胶束的协同作用机制
关键词:疏水缔合聚丙烯酸;蠕虫状胶柬;流变性;表观粘度;耗散颗粒动力学分子模拟
均方根末端距
中图分类号:O641;O631
Synergism between Hydrophobically Modified Polyacrylic Acid and
Wormlike Micelles
MEI Yong-jun HAN Yi-xiu ZHOU Hong? YAO Lin JIANG Bo
(College of Chemistry, Sichuan University Chengdu 610065, P R China
The Second Research Institute of Civil Aviation Administration ofchina, Chengdu 61004L, P R. China
Abstract: The synergism between wormlike mice les formed from sodium oleate(NAOA)and
hydrophobically modified polyacrylic acid (MPA was investigated according to their macroscopic
performances and mesoscopic scales, using a combination of viscosity/rheology measurements and
dissipative particle dynamic(Dpdmoecular imulations. The rheology of NAOA wormlike micelles
change sican w e ition f a small amun of HMPA which verif he synergic effect
between them. A peak in the apparent viscosity was observed following an increase in the concentration o
HMPA suggesting that e s ne isic effect was resrced by the composition of the mixture. A DPD
simuation al ome at e solution composition had an influence on the root mean square(RMS)
end-to-end distances of HMPA, with the observed value fluctuating according to NAOA and HMPA
concentrations. The micellar morphology affected the RMS end-to-end distances of HMPA and the
presence of NAOA micelles exerted a significant impact on the extension of HMPA at high HMPA
concentrations. A proposed synergistic mechanism has been presented according to the experimental and
simulation results
Key Words: Hydrophobically modified polyacrylic acid; Wormlike micelle; Rheology; Apparent
viscosity; Dissipative particle dynamics molecular simulation; Root mean square
end-to-end distanc
Received: January 15, 2012; Revised: April 23, 2012; Published on Web: April 23, 2012
Corresponding author. Email: jiangbo(scu.. cn; Tel: +86-28-85418112
The project was supported by the National Natural Science Foundation of China and Civil Aviation Administration of China(60979020, 60939001)
国家自然科学基金-民航联合基金(60979020,60939001)资助项目
O Editorial office of Acta Physico-chimica Sinica