ICCAS OpenIR
H-1 NMR spectroscopic investigations on the micellization and gelation of PEO-PPO-PEO block copolymers in aqueous solutions
Ma, Jun-He; Guo, Chen; Tang, Ya-Lin; Liu, Hui-Zhou
2007-09-11
Source PublicationLANGMUIR
ISSN0743-7463
Volume23Issue:19Pages:9596-9605
AbstractThe effects of temperature, polymer composition, and concentration on the micellization and gelation properties of poly(ethylene oxide) -poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers in aqueous solutions were investigated by H-1 NMR spectroscopy. It was found that the temperature-dependent behavior of PPO blocks, observed as changes in chemical shift, half-height width, and integral value, could be attributed as an intrinsic tool to characterize the transition states during unimer to micelle formation. The H-1 NMR spectral analysis revealed that the hydrophobic part, PPO, of the Pluronic polymers plays a more significant role in the temperature-induced micellization, whereas the transitional behavior of Pluronic polymer, i.e., from micellization to liquid crystals formation, resulted in the drastic broadening of the spectral signals for the PEO, indicating that the PEO segments play a more significant role in the crystallization process. It was also observed that the temperature-dependent changes in the half-height width of the PEO -CH2- signal are sensitive to the liquid crystalline phase formation, which could be attributed to the close packing of spherical micelles at high polymer concentrations or temperatures.
DOI10.1021/1a701221f
Indexed BySCI
Language英语
WOS IDWOS:000249241300016
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:81[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/62314
Collection中国科学院化学研究所
Corresponding AuthorGuo, Chen
Affiliation1.Grad Univ Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Lab Separt Sci, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Ma, Jun-He,Guo, Chen,Tang, Ya-Lin,et al. H-1 NMR spectroscopic investigations on the micellization and gelation of PEO-PPO-PEO block copolymers in aqueous solutions[J]. LANGMUIR,2007,23(19):9596-9605.
APA Ma, Jun-He,Guo, Chen,Tang, Ya-Lin,&Liu, Hui-Zhou.(2007).H-1 NMR spectroscopic investigations on the micellization and gelation of PEO-PPO-PEO block copolymers in aqueous solutions.LANGMUIR,23(19),9596-9605.
MLA Ma, Jun-He,et al."H-1 NMR spectroscopic investigations on the micellization and gelation of PEO-PPO-PEO block copolymers in aqueous solutions".LANGMUIR 23.19(2007):9596-9605.
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