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Mechanism of PEO-PPO-PEO micellization in aqueous solutions studied by two-dimensional correlation FTIR spectroscopy
Jia, Lianwei1; Guo, Chen1; Yang, Liangrong1; Xiang, Junfeng2; Tang, Yalin2; Liu, Chunzhao1; Liu, Huizhou1; Guo, C
2010-05-15
Source PublicationJOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN0021-9797
Volume345Issue:2Pages:332-337
AbstractThe micellization mechanism of PEO-PPO-PEO block copolymer in aqueous solutions was studied by two-dimensional correlation FTIR spectroscopy. The 1400-1000 cm(-1) region was investigated, involving the stretching vibrations of ether band, C-H wagging vibrations of EO methylene groups and C-H symmetric deformation vibrations of PO methyl groups. In the 2D correlated spectra, the hydrous and anhydrous state of the ether band, PO methyl groups, and the two conformations of EO methylene groups were observed. Molecules with different PO lengths and increasing molecular weight were investigated to determine the sequence of association of the separate groups. During temperature-induced micellization, the following changes were detected: firstly, EO methylene groups changed from a gauche state to a trans state; secondly, conformational transitions led to the dehydration of hydrated methyl groups; next, the hydrogen bonding between C-O band and water diminished; and finally, dehydrated groups approached to form hydrophobic cores, resulting in micelle formation. From this variation in the sequence of group associations, it is concluded that aggregates of unimers first formed, then hydrophobic cores formed through the hydrophobic interaction from dehydrated PPO blocks, and proper micelles eventually evolved. The temperature-induced conformational changes are suggested the reason for micellization. (C) 2010 Elsevier Inc. All rights reserved.
KeywordPluronic Block Copolymer Micellization 2d Ftir
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.jcis.2010.01.060
Indexed BySCI
Language英语
WOS KeywordOXIDE) TRIBLOCK COPOLYMER ; BLOCK-COPOLYMERS ; POLY(ETHYLENE OXIDE) ; CONFORMATIONAL STRUCTURE ; DRUG-DELIVERY ; TEMPERATURE ; BEHAVIOR ; SYSTEMS ; RAMAN ; NMR
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
WOS IDWOS:000276729200030
Citation statistics
Cited Times:37[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6151
Collection生化工程国家重点实验室
Corresponding AuthorGuo, C
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Jia, Lianwei,Guo, Chen,Yang, Liangrong,et al. Mechanism of PEO-PPO-PEO micellization in aqueous solutions studied by two-dimensional correlation FTIR spectroscopy[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2010,345(2):332-337.
APA Jia, Lianwei.,Guo, Chen.,Yang, Liangrong.,Xiang, Junfeng.,Tang, Yalin.,...&Guo, C.(2010).Mechanism of PEO-PPO-PEO micellization in aqueous solutions studied by two-dimensional correlation FTIR spectroscopy.JOURNAL OF COLLOID AND INTERFACE SCIENCE,345(2),332-337.
MLA Jia, Lianwei,et al."Mechanism of PEO-PPO-PEO micellization in aqueous solutions studied by two-dimensional correlation FTIR spectroscopy".JOURNAL OF COLLOID AND INTERFACE SCIENCE 345.2(2010):332-337.
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