Salt-induced micellization of a triblock copolymer in aqueous solution: A H-1 nuclear magnetic resonance spectroscopy study
文献类型：期刊论文
| 作者 | Ma, Jun-he; Guo, Chen; Tang, Ya-lin; Wang, Jing; Zheng, Lily; Liang, Xiang-feng; Chen, Shu; Liu, Hui-zhou |
| 刊名 | LANGMUIR
 |
| 出版日期 | 2007-03-13 |
| 卷号 | 23期号:6页码:3075-3083 |
| 关键词 | peo block-copolymer angle neutron-scattering differential scanning calorimetry poly(ethylene oxide) poly(propylene oxide) propylene-oxide ethylene-oxide aggregation behavior association behavior micellar structure |
| ISSN号 | 0743-7463 |
| 其他题名 | Langmuir |
| 中文摘要 | An aqueous micellar solution of a PEO-PPO-PEO triblock copolymer, pluronic F88 (EO103PO39EO103), in the presence of salt (KCl) has been investigated by H-1 NMR spectroscopy. The hydrogen-bonding structure in water is directly changed by the strong polarization effect of added salt, which indirectly weakens the interaction of polymer molecules with water. Both EO and PO blocks are dehydrated by the addition of salt in a similar way, whereas the solubility of the PO blocks may be affected in a more pronounced way, which results in the decrease of the critical micellization temperature (CMT). It is found that the addition of salt favors a more compact micellar core, where the water content is decreased and an effective PO-PO interaction is increased. Increasing the salt concentration would result in a decrease in the number of gauche conformers in the PPO chain, which may be the deeper reason for the decreasing solubility of PPO segments in aqueous salt solution. The temperature region over which the micellization occurs is broad, indicating that micelles and unimers coexist over an extended temperature range, whereas this transition region is significantly narrowed by the addition of salt. The addition of salt offers a good substitute way of changing the temperature to induce micellization. The critical micellization salt concentration (CMSC) is determined to be 1.0 mol l(-1) for KCl in 2.5% aqueous pluronic F88 solution at 25 degrees C, and the transition region in which both free and associated copolymer molecules coexist is defined to range from 1 to 2 mol L-1. |
| 英文摘要 | An aqueous micellar solution of a PEO-PPO-PEO triblock copolymer, pluronic F88 (EO103PO39EO103), in the presence of salt (KCl) has been investigated by H-1 NMR spectroscopy. The hydrogen-bonding structure in water is directly changed by the strong polarization effect of added salt, which indirectly weakens the interaction of polymer molecules with water. Both EO and PO blocks are dehydrated by the addition of salt in a similar way, whereas the solubility of the PO blocks may be affected in a more pronounced way, which results in the decrease of the critical micellization temperature (CMT). It is found that the addition of salt favors a more compact micellar core, where the water content is decreased and an effective PO-PO interaction is increased. Increasing the salt concentration would result in a decrease in the number of gauche conformers in the PPO chain, which may be the deeper reason for the decreasing solubility of PPO segments in aqueous salt solution. The temperature region over which the micellization occurs is broad, indicating that micelles and unimers coexist over an extended temperature range, whereas this transition region is significantly narrowed by the addition of salt. The addition of salt offers a good substitute way of changing the temperature to induce micellization. The critical micellization salt concentration (CMSC) is determined to be 1.0 mol l(-1) for KCl in 2.5% aqueous pluronic F88 solution at 25 degrees C, and the transition region in which both free and associated copolymer molecules coexist is defined to range from 1 to 2 mol L-1. |
| WOS标题词 | Science & Technology ; Physical Sciences ; Technology |
| 类目[WOS] | Chemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary |
| 研究领域[WOS] | Chemistry ; Materials Science |
| 关键词[WOS] | PEO BLOCK-COPOLYMER ; ANGLE NEUTRON-SCATTERING ; DIFFERENTIAL SCANNING CALORIMETRY ; POLY(ETHYLENE OXIDE) ; POLY(PROPYLENE OXIDE) ; PROPYLENE-OXIDE ; ETHYLENE-OXIDE ; AGGREGATION BEHAVIOR ; ASSOCIATION BEHAVIOR ; MICELLAR STRUCTURE |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| WOS记录号 | WOS:000244650000021 |
| 公开日期 | 2013-10-15 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/3408]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 作者单位 | 1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Lab Separat Sci & Engn, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China 3.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ma, Jun-he,Guo, Chen,Tang, Ya-lin,et al. Salt-induced micellization of a triblock copolymer in aqueous solution: A H-1 nuclear magnetic resonance spectroscopy study[J]. LANGMUIR,2007,23(6):3075-3083. |
| APA | Ma, Jun-he.,Guo, Chen.,Tang, Ya-lin.,Wang, Jing.,Zheng, Lily.,...&Liu, Hui-zhou.(2007).Salt-induced micellization of a triblock copolymer in aqueous solution: A H-1 nuclear magnetic resonance spectroscopy study.LANGMUIR,23(6),3075-3083. |
| MLA | Ma, Jun-he,et al."Salt-induced micellization of a triblock copolymer in aqueous solution: A H-1 nuclear magnetic resonance spectroscopy study".LANGMUIR 23.6(2007):3075-3083. |
入库方式： OAI收割
来源：过程工程研究所
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