Concentration Fluctuations near Lower Critical Solution Temperature in Ternary Aqueous Solutions

doi:10.1021/acs.macromol.7b01502

	Concentration Fluctuations near Lower Critical Solution Temperature in Ternary Aqueous Solutions
	Jia D(贾迪); Cheng H(程贺); Harnmouda, B; Han, CC; Cheng, H; Muthukumar, M; Jia, D
刊名	MACROMOLECULES
	2017
卷号	50 期号:18 页码:7291-7298
ISSN号	0024-9297
DOI	10.1021/acs.macromol.7b01502
文献子类	Article
英文摘要	The effects of osmolytes, such as trimethylamine N-oxide (TMAO), on the phase transition in an aqueous solution of polymer, protein, or DNA are very complex, and several phase transitions can occur. In order to explore such effects, we take a simple ternary system of poly(N,N-diethylacrylarnide) and a 'favorable solvent pair TMAO and water to monitor the reduction in the miscibility of the polymer using small-angle neutron scattering (SANS) and dynamic light scattering (DLS). The result shows that the LCST of PDEA solutions is significantly depressed by TMAO. Although DLS data dearly show that aggregates can form, as precursors in the homogeneous one phase region depending on the TMAO concentration, after removing the low-q aggregate region, the three-component system still obeys the mean-field theory. Based on the ternary random phase approximation (RPA) theory, three Flory-Huggins interaction parameters, i.e., XD2O-TMAO, XPDEA-TMAO, and x(pDEA-D20), are obtained to reveal the microscopic origin of this shift in LCST; that is, the strong TMAO-D2O interaction leads to the decrease of LCST. Our study opens up many directions to explore effects such as the interference between aggregation and microphase separation.
电子版国际标准刊号	1520-5835
WOS关键词	TRIMETHYLAMINE N-OXIDE ; TO-COIL TRANSITION ; WATER/METHANOL MIXTURES ; MOLECULAR-DYNAMICS ; WATER ; POLY(N-ISOPROPYLACRYLAMIDE) ; CONONSOLVENCY ; PNIPAM ; METHANOL ; CHAINS
WOS研究方向	Polymer Science
语种	英语
WOS记录号	WOS:000411918700029
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284991]
专题	高能物理研究所_东莞分部高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Jia D,Cheng H,Harnmouda, B,et al. Concentration Fluctuations near Lower Critical Solution Temperature in Ternary Aqueous Solutions[J]. MACROMOLECULES,2017,50(18):7291-7298.
APA	贾迪.,程贺.,Harnmouda, B.,Han, CC.,Cheng, H.,...&Jia, D.(2017).Concentration Fluctuations near Lower Critical Solution Temperature in Ternary Aqueous Solutions.MACROMOLECULES,50(18),7291-7298.
MLA	贾迪,et al."Concentration Fluctuations near Lower Critical Solution Temperature in Ternary Aqueous Solutions".MACROMOLECULES 50.18(2017):7291-7298.