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Study of salt effects on the micellization of PEO-PPO-PEO block copolymer in aqueous solution by FTIR spectroscopy
Alternative TitleLangmuir
Su, YL; Liu, HZ; Wang, J; Chen, JY
2002-02-05
Source PublicationLANGMUIR
ISSN0743-7463
Volume18Issue:3Pages:865-871
AbstractThe micellization of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymer in aqueous solution in the absence and presence of salts was studied by Fourier transform infrared (FTIR) spectroscopy. The temperature-dependent changes of the C-O-C stretching vibration band were used to denote critical micellization temperatures (CMT). The CMT of Pluronic F127 in aqueous solution was modified significantly by the addition of salts as previously shown. The proportion of the anhydrous methyl groups was increased, while the proportion of the hydrated methyl groups was decreased during the micellization process. The dehydration of the Pluronic F127 ether backbone in the micellization process could also be inferred by the FTIR spectral data from a shift of the frequency of the C-O-C stretching band toward higher wavenumbers and broadening of the bandwidth of the C-O-C stretching band. The salt influence on the bandwidth is stronger than that on the wavenumber for the C-O-C stretching vibration. The microenvironmental difference between the PPO and PEO blocks of the copolymer is smaller in aqueous KBr solution than in other types of salt solutions. It was also found that part of the PEO segments of Pluronic F127 in aqueous salt solutions are in the crystalline state.; The micellization of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymer in aqueous solution in the absence and presence of salts was studied by Fourier transform infrared (FTIR) spectroscopy. The temperature-dependent changes of the C-O-C stretching vibration band were used to denote critical micellization temperatures (CMT). The CMT of Pluronic F127 in aqueous solution was modified significantly by the addition of salts as previously shown. The proportion of the anhydrous methyl groups was increased, while the proportion of the hydrated methyl groups was decreased during the micellization process. The dehydration of the Pluronic F127 ether backbone in the micellization process could also be inferred by the FTIR spectral data from a shift of the frequency of the C-O-C stretching band toward higher wavenumbers and broadening of the bandwidth of the C-O-C stretching band. The salt influence on the bandwidth is stronger than that on the wavenumber for the C-O-C stretching vibration. The microenvironmental difference between the PPO and PEO blocks of the copolymer is smaller in aqueous KBr solution than in other types of salt solutions. It was also found that part of the PEO segments of Pluronic F127 in aqueous salt solutions are in the crystalline state.
KeywordOxide) Triblock Copolymers Angle Neutron-scattering Temperature-dependent Micellization Differential Scanning Calorimetry Poly(Ethylene Oxide) Micelle Formation Propylene-oxide Ethylene-oxide Water-system Aggregation Behavior
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1021/la0106687
URL查看原文
Indexed BySCI
Language英语
WOS KeywordOXIDE) TRIBLOCK COPOLYMERS ; ANGLE NEUTRON-SCATTERING ; TEMPERATURE-DEPENDENT MICELLIZATION ; DIFFERENTIAL SCANNING CALORIMETRY ; POLY(ETHYLENE OXIDE) ; MICELLE FORMATION ; PROPYLENE-OXIDE ; ETHYLENE-OXIDE ; WATER-SYSTEM ; AGGREGATION BEHAVIOR
WOS Research AreaChemistry ; Materials Science
WOS SubjectChemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary
WOS IDWOS:000173646300042
Citation statistics
Cited Times:98[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5642
Collection研究所(批量导入)
AffiliationChinese Acad Sci, Inst Chem Met, State Key Lab Biochem Engn, Young Scientist Lab Separat Sci & Engn, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Su, YL,Liu, HZ,Wang, J,et al. Study of salt effects on the micellization of PEO-PPO-PEO block copolymer in aqueous solution by FTIR spectroscopy[J]. LANGMUIR,2002,18(3):865-871.
APA Su, YL,Liu, HZ,Wang, J,&Chen, JY.(2002).Study of salt effects on the micellization of PEO-PPO-PEO block copolymer in aqueous solution by FTIR spectroscopy.LANGMUIR,18(3),865-871.
MLA Su, YL,et al."Study of salt effects on the micellization of PEO-PPO-PEO block copolymer in aqueous solution by FTIR spectroscopy".LANGMUIR 18.3(2002):865-871.
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