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Hydration and conformation of temperature-dependent micellization of PEO-PPO-PEO block copolymers in aqueous solutions by FT-Raman
Alternative TitleLangmuir
Guo, C; Wang, J; Liu, HZ; Chen, JY
1999-04-13
Source PublicationLANGMUIR
ISSN0743-7463
Volume15Issue:8Pages:2703-2708
Abstracthe 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.; 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.
KeywordOxide)-b-poly(Ethylene Oxide) Copolymers Micelle Formation Phase-behavior Potassium Fluoride Triblock Copolymer Lattice Theory Association Probe Water Thermodynamics
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
URL查看原文
Indexed BySCI
Language英语
WOS KeywordOXIDE)-B-POLY(ETHYLENE OXIDE) COPOLYMERS ; MICELLE FORMATION ; PHASE-BEHAVIOR ; POTASSIUM FLUORIDE ; TRIBLOCK COPOLYMER ; LATTICE THEORY ; ASSOCIATION ; PROBE ; WATER ; THERMODYNAMICS
WOS Research AreaChemistry ; Materials Science
WOS SubjectChemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary
WOS IDWOS:000079775700015
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Cited Times:124[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5957
Collection研究所(批量导入)
AffiliationChinese Acad Sci, Inst Chem Met, Young Scientist Lab Separat Sci & Engn, Beijing 100080, Peoples R China
Recommended Citation
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.
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