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Influence of 1-pentanol on the micellization of poly(ethylene oxide)-polypropylene oxide)-polyethylene oxide) block copolymers in aqueous solutions
Alternative TitleLangmuir
Su, YL; Wei, XF; Liu, HZ
2003-04-01
Source PublicationLANGMUIR
ISSN0743-7463
Volume19Issue:7Pages:2995-3000
AbstractThe critical micellization temperature (CMT) of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers in water has been determined by using the temperature-dependent fluorescence intensity of pyrene. The CMT of Pluronic polymers in aqueous solutions is decreased by the addition of 1-pentanol. The thermodynamic parameters of micellization are obtained from the temperature derivatives of the ln(X-CMC) (CMC = critical micellization concentration) values. The standard enthalpy and entropy of micellization for Pluronic polymers in water are increased with an increase of the 1-pentanol content. The more PEO component in the Pluronic polymer, the higher the changed values of micellization enthalpy and entropy. The solubilization of 1-pentanol in the micelles was used to explain the relationship between the changed values of thermodynamic parameters of micellization and the composition of Pluronic polymers, in which the water in the micellar cores is replaced by the solubilized 1-pentanol. The I-1/I-3 ratio of pyrene in aqueous Pluronic polymer solutions at temperatures below the CMT is decreased with an increase of the 1-pentanol concentration. A less polar microenvironment will be formed in the regions of unexpanded PPO coils when more 1-pentanol is added to the aqueous Pluronic polymer solution. The decrease of PPO solubility will result in the shift of CMT toward lower temperature.; The critical micellization temperature (CMT) of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers in water has been determined by using the temperature-dependent fluorescence intensity of pyrene. The CMT of Pluronic polymers in aqueous solutions is decreased by the addition of 1-pentanol. The thermodynamic parameters of micellization are obtained from the temperature derivatives of the ln(X-CMC) (CMC = critical micellization concentration) values. The standard enthalpy and entropy of micellization for Pluronic polymers in water are increased with an increase of the 1-pentanol content. The more PEO component in the Pluronic polymer, the higher the changed values of micellization enthalpy and entropy. The solubilization of 1-pentanol in the micelles was used to explain the relationship between the changed values of thermodynamic parameters of micellization and the composition of Pluronic polymers, in which the water in the micellar cores is replaced by the solubilized 1-pentanol. The I-1/I-3 ratio of pyrene in aqueous Pluronic polymer solutions at temperatures below the CMT is decreased with an increase of the 1-pentanol concentration. A less polar microenvironment will be formed in the regions of unexpanded PPO coils when more 1-pentanol is added to the aqueous Pluronic polymer solution. The decrease of PPO solubility will result in the shift of CMT toward lower temperature.
KeywordAngle Neutron-scattering Differential Scanning Calorimetry Sodium Dodecyl-sulfate Peo Triblock Copolymer Micelle Formation Structural-properties Aggregation Behavior Fluorescence Probe Ftir Spectroscopy Phase-diagrams
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1021/la026584v
URL查看原文
Indexed BySCI
Language英语
WOS KeywordANGLE NEUTRON-SCATTERING ; DIFFERENTIAL SCANNING CALORIMETRY ; SODIUM DODECYL-SULFATE ; PEO TRIBLOCK COPOLYMER ; MICELLE FORMATION ; STRUCTURAL-PROPERTIES ; AGGREGATION BEHAVIOR ; FLUORESCENCE PROBE ; FTIR SPECTROSCOPY ; PHASE-DIAGRAMS
WOS Research AreaChemistry ; Materials Science
WOS SubjectChemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary
WOS IDWOS:000181980900064
Citation statistics
Cited Times:58[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5300
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,Wei, XF,Liu, HZ. Influence of 1-pentanol on the micellization of poly(ethylene oxide)-polypropylene oxide)-polyethylene oxide) block copolymers in aqueous solutions[J]. LANGMUIR,2003,19(7):2995-3000.
APA Su, YL,Wei, XF,&Liu, HZ.(2003).Influence of 1-pentanol on the micellization of poly(ethylene oxide)-polypropylene oxide)-polyethylene oxide) block copolymers in aqueous solutions.LANGMUIR,19(7),2995-3000.
MLA Su, YL,et al."Influence of 1-pentanol on the micellization of poly(ethylene oxide)-polypropylene oxide)-polyethylene oxide) block copolymers in aqueous solutions".LANGMUIR 19.7(2003):2995-3000.
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