ICCAS OpenIR
Evidence of formation of site-selective inclusion complexation between beta-cyclodextrin and poly(ethylene oxide)-block-poly(propylene oxide)-block-poly, ethylene oxide. copolymers
Tsai, Chi-Chun2; Zhang, Wen-Bin2; Wang, Chien-Lung2; Van Horn, Ryan M.2; Graham, Matthew J.2; Huang, Jing3; Chen, Yongming1; Guo, Mingming2; Cheng, Stephen Z. D.2
2010-05-28
Source PublicationJOURNAL OF CHEMICAL PHYSICS
ISSN0021-9606
Volume132Issue:20
AbstractA series of inclusion complexes of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (PEO-b-PPO-b-PEO) with beta-cyclodextrin (beta-CD) was prepared. Their formation, structure, and dynamics were investigated by solution two-dimensional rotating-frame Overhauser effect spectroscopy (2D ROESY) and one-dimensional (1D) and 2D solid-state (13)C NMR. The inclusion complexes between the PEO-b-PPO-b-PEO copolymers and the beta-CDs were formed in aqueous solution and detected by 2D ROESY. The high efficiency of cross polarization and spin diffusion experiments in (13)C solid-state NMR showed that the mobility of the PPO blocks dramatically decreases after beta-CD complexation, indicating that they are selectively incorporated onto the PPO blocks. The hydrophobic cavities of beta-CD restrict the PPO block mobility, which is evidence of the formation of inclusion complexes in the solid state. The 2D wide-line separation NMR experiments suggested that beta-CDs only thread onto the PPO blocks while forming the inclusion complexes. The stoichiometry of inclusion complexes was studied using (1)H NMR, and a 3:1 (PO unit to beta-CD) was found for all inclusion complexes, which indicated that the number of threaded beta-CDs was only dependent on the molecular weight of the PPO blocks. 1D wide angle x-ray diffraction studies demonstrated that the beta-CD in the inclusion complex formed a channel-like structure that is different from the pure beta-CD crystal structure. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3428769]
KeywordCrystal Structure Materials Preparation Nuclear Magnetic Resonance Overhauser Effect Polymer Blends Stoichiometry X-ray Diffraction
DOI10.1063/1.3428769
Indexed BySCI
Language英语
WOS IDWOS:000278183100030
PublisherAMER INST PHYSICS
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/68826
Collection中国科学院化学研究所
Corresponding AuthorChen, Yongming
Affiliation1.Chinese Acad Sci, State Key Lab Polymer Phys & Chem, Inst Chem, Beijing 100190, Peoples R China
2.Univ Akron, Coll Polymer Sci & Polymer Engn, Dept Polymer Sci, Akron, OH 44325 USA
3.Wuhan Univ Technol, Coll Chem Engn, Wuhan 430070, Peoples R China
Recommended Citation
GB/T 7714
Tsai, Chi-Chun,Zhang, Wen-Bin,Wang, Chien-Lung,et al. Evidence of formation of site-selective inclusion complexation between beta-cyclodextrin and poly(ethylene oxide)-block-poly(propylene oxide)-block-poly, ethylene oxide. copolymers[J]. JOURNAL OF CHEMICAL PHYSICS,2010,132(20).
APA Tsai, Chi-Chun.,Zhang, Wen-Bin.,Wang, Chien-Lung.,Van Horn, Ryan M..,Graham, Matthew J..,...&Cheng, Stephen Z. D..(2010).Evidence of formation of site-selective inclusion complexation between beta-cyclodextrin and poly(ethylene oxide)-block-poly(propylene oxide)-block-poly, ethylene oxide. copolymers.JOURNAL OF CHEMICAL PHYSICS,132(20).
MLA Tsai, Chi-Chun,et al."Evidence of formation of site-selective inclusion complexation between beta-cyclodextrin and poly(ethylene oxide)-block-poly(propylene oxide)-block-poly, ethylene oxide. copolymers".JOURNAL OF CHEMICAL PHYSICS 132.20(2010).
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