Evidence of formation of site-selective inclusion complexation between beta-cyclodextrin and poly(ethylene oxide)-block-poly(propylene oxide)-block-poly, ethylene oxide. copolymers
文献类型：期刊论文
| 作者 | 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 |
| 刊名 | JOURNAL OF CHEMICAL PHYSICS
 |
| 出版日期 | 2010-05-28 |
| 卷号 | 132期号:20 |
| 关键词 | Crystal Structure Materials Preparation Nuclear Magnetic Resonance Overhauser Effect Polymer Blends Stoichiometry X-ray Diffraction |
| ISSN号 | 0021-9606 |
| DOI | 10.1063/1.3428769 |
| 英文摘要 | A 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] |
| 语种 | 英语 |
| WOS记录号 | WOS:000278183100030 |
| 出版者 | AMER INST PHYSICS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/68825]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Chen, Yongming |
| 作者单位 | 1.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 |
| 推荐引用方式 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). |
入库方式： OAI收割
来源：化学研究所
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