Hydration and conformation of temperature-dependent micellization of PEO-PPO-PEO block copolymers in aqueous solutions by FT-Raman

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	Hydration and conformation of temperature-dependent micellization of PEO-PPO-PEO block copolymers in aqueous solutions by FT-Raman
	Guo, C; Wang, J; Liu, HZ; Chen, JY
刊名	LANGMUIR
	1999-04-13
卷号	15 期号:8 页码:2703-2708
关键词	oxide)-b-poly(ethylene oxide) copolymers micelle formation phase-behavior potassium fluoride triblock copolymer lattice theory association probe water thermodynamics
ISSN号	0743-7463
其他题名	Langmuir
中文摘要	he micellization of four triblock copolymers of the poly(ethylene oxide)(x)-poly(propylene oxide)(y)-poly(ethylene oxide)(x) type (Pluronic P103, P104, P105, and F88) in aqueous solutions versus temperature is followed by Fouler transform-(FT-) Raman spectroscopy. The frequencies and relative intensities of C-H stretching bands in FT-Raman spectra are sensitive to the local polarity and conformation of block copolymer chains, and their variations with temperature are indicators of micellization. Therefore, the critical micellization temperatures of these copolymers of 10% concentration in aqueous solutions are determined. The deconvolution method is used to resolve the overlapping bands in the C-H stretching region, and the deconvoluted spectra provide information about the structural and microenvironmental changes of ethylene oxide (EO) and propylene oxide (PO) blocks, respectively. The hydration of the EO chains in the corona is found to diminish with increasing temperature, and the conformation changes to a more disordered structure. The structure of PO chains changes from a more polar, gauche conformation at low temperatures to a less polar, stretching conformation at high temperatures. The micellization is explained by the change in structure and microenvironment of the EO and PO units. The results confirm the leading role of the hydrophobic PO units in micellization, and reveal a favorable contribution of the hydrophilic EO units.
英文摘要	he micellization of four triblock copolymers of the poly(ethylene oxide)(x)-poly(propylene oxide)(y)-poly(ethylene oxide)(x) type (Pluronic P103, P104, P105, and F88) in aqueous solutions versus temperature is followed by Fouler transform-(FT-) Raman spectroscopy. The frequencies and relative intensities of C-H stretching bands in FT-Raman spectra are sensitive to the local polarity and conformation of block copolymer chains, and their variations with temperature are indicators of micellization. Therefore, the critical micellization temperatures of these copolymers of 10% concentration in aqueous solutions are determined. The deconvolution method is used to resolve the overlapping bands in the C-H stretching region, and the deconvoluted spectra provide information about the structural and microenvironmental changes of ethylene oxide (EO) and propylene oxide (PO) blocks, respectively. The hydration of the EO chains in the corona is found to diminish with increasing temperature, and the conformation changes to a more disordered structure. The structure of PO chains changes from a more polar, gauche conformation at low temperatures to a less polar, stretching conformation at high temperatures. The micellization is explained by the change in structure and microenvironment of the EO and PO units. The results confirm the leading role of the hydrophobic PO units in micellization, and reveal a favorable contribution of the hydrophilic EO units.
WOS标题词	Science & Technology ; Physical Sciences ; Technology
类目[WOS]	Chemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary
研究领域[WOS]	Chemistry ; Materials Science
关键词[WOS]	OXIDE)-B-POLY(ETHYLENE OXIDE) COPOLYMERS ; MICELLE FORMATION ; PHASE-BEHAVIOR ; POTASSIUM FLUORIDE ; TRIBLOCK COPOLYMER ; LATTICE THEORY ; ASSOCIATION ; PROBE ; WATER ; THERMODYNAMICS
收录类别	SCI
原文出处	://WOS:000079775700015
语种	英语
WOS记录号	WOS:000079775700015
公开日期	2013-11-15
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/5957]
专题	过程工程研究所_研究所（批量导入）
作者单位	Chinese Acad Sci, Inst Chem Met, Young Scientist Lab Separat Sci & Engn, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Guo, C,Wang, J,Liu, HZ,et al. Hydration and conformation of temperature-dependent micellization of PEO-PPO-PEO block copolymers in aqueous solutions by FT-Raman[J]. LANGMUIR,1999,15(8):2703-2708.
APA	Guo, C,Wang, J,Liu, HZ,&Chen, JY.(1999).Hydration and conformation of temperature-dependent micellization of PEO-PPO-PEO block copolymers in aqueous solutions by FT-Raman.LANGMUIR,15(8),2703-2708.
MLA	Guo, C,et al."Hydration and conformation of temperature-dependent micellization of PEO-PPO-PEO block copolymers in aqueous solutions by FT-Raman".LANGMUIR 15.8(1999):2703-2708.