中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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
ISSN号0743-7463
DOI10.1021/la063203v
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.
语种英语
WOS记录号WOS:000244650000021
出版者AMER CHEMICAL SOC
源URL[http://ir.iccas.ac.cn/handle/121111/60455]  
专题中国科学院化学研究所
通讯作者Guo, Chen
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:化学研究所

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