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FTIR spectroscopic study on effects of temperature and polymer composition on the structural properties of PEO-PPO-PEO block copolymer micelles
Alternative TitleLangmuir
Su, YL; Wang, J; Liu, HZ
2002-07-09
Source PublicationLANGMUIR
ISSN0743-7463
Volume18Issue:14Pages:5370-5374
AbstractFourier transform infrared spectroscopy was used to study the effects of temperature and polymer composition on the structural proper-ties of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymer micelles in D2O solutions. The intrinsic probe, methyl groups in PPO blocks, is very sensitive to the local environment and used to characterize the aggregation process. When the temperature approaches the critical micellization temperature, the antisymmetric C-H stretching band of methyl groups and the symmetric deformation band of methyl groups shift toward lower frequencies. It indicates that the methyl groups are experiencing a progressively less polar environment and the interaction of methyl groups with water molecules is weakened by heat. At higher temperatures, the symmetric deformation mode of methyl groups is composed of two bands, which are assignable to hydrated (the band at 1378 cm(-1)) and dehydrated states (the band at 1373 cm(-1)). Part of methyl groups are dehydrated, and a significantly nonpolar microenvironment is created. The proportion of dehydrated methyl groups in Pluronic micelles increases with an increase of temperature, which means exclusion of water from the micellar core and formation of micelles with a denser PPO core at higher temperatures. The composition of Pluronic polymers also has a strong effect on the structural properties of the micelles. A more hydrophobic Pluronic polymer would form micelles with a higher proportion of the dehydrated methyl groups.; Fourier transform infrared spectroscopy was used to study the effects of temperature and polymer composition on the structural proper-ties of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymer micelles in D2O solutions. The intrinsic probe, methyl groups in PPO blocks, is very sensitive to the local environment and used to characterize the aggregation process. When the temperature approaches the critical micellization temperature, the antisymmetric C-H stretching band of methyl groups and the symmetric deformation band of methyl groups shift toward lower frequencies. It indicates that the methyl groups are experiencing a progressively less polar environment and the interaction of methyl groups with water molecules is weakened by heat. At higher temperatures, the symmetric deformation mode of methyl groups is composed of two bands, which are assignable to hydrated (the band at 1378 cm(-1)) and dehydrated states (the band at 1373 cm(-1)). Part of methyl groups are dehydrated, and a significantly nonpolar microenvironment is created. The proportion of dehydrated methyl groups in Pluronic micelles increases with an increase of temperature, which means exclusion of water from the micellar core and formation of micelles with a denser PPO core at higher temperatures. The composition of Pluronic polymers also has a strong effect on the structural properties of the micelles. A more hydrophobic Pluronic polymer would form micelles with a higher proportion of the dehydrated methyl groups.
KeywordAngle Neutron-scattering Oxide) Triblock Copolymers Aqueous-solution Poly(Ethylene Oxide) Phase-transitions Dependent Micellization Aggregation Behavior Light-scattering Lattice Theory Water-system
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1021/la020007p
URL查看原文
Indexed BySCI
Language英语
WOS KeywordANGLE NEUTRON-SCATTERING ; OXIDE) TRIBLOCK COPOLYMERS ; AQUEOUS-SOLUTION ; POLY(ETHYLENE OXIDE) ; PHASE-TRANSITIONS ; DEPENDENT MICELLIZATION ; AGGREGATION BEHAVIOR ; LIGHT-SCATTERING ; LATTICE THEORY ; WATER-SYSTEM
WOS Research AreaChemistry ; Materials Science
WOS SubjectChemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary
WOS IDWOS:000176627000009
Citation statistics
Cited Times:94[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5645
Collection研究所(批量导入)
AffiliationChinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Young Scientist Lab Separat Sci & Engn, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Su, YL,Wang, J,Liu, HZ. FTIR spectroscopic study on effects of temperature and polymer composition on the structural properties of PEO-PPO-PEO block copolymer micelles[J]. LANGMUIR,2002,18(14):5370-5374.
APA Su, YL,Wang, J,&Liu, HZ.(2002).FTIR spectroscopic study on effects of temperature and polymer composition on the structural properties of PEO-PPO-PEO block copolymer micelles.LANGMUIR,18(14),5370-5374.
MLA Su, YL,et al."FTIR spectroscopic study on effects of temperature and polymer composition on the structural properties of PEO-PPO-PEO block copolymer micelles".LANGMUIR 18.14(2002):5370-5374.
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