Salt induced micellization of very hydrophilic PEO-PPO-PEO block copolymers in aqueous solutions
文献类型：期刊论文
| 作者 | Patel, K.; Bahadur, P.; Guo, C.; Ma, J. H.; Liu, H. Z.; Yamashita, Y.; Khanal, A.; Nakashima, K. |
| 刊名 | EUROPEAN POLYMER JOURNAL
 |
| 出版日期 | 2007-05-01 |
| 卷号 | 43期号:5页码:1699-1708 |
| 关键词 | block copolymer pluronic micellization cloud point |
| ISSN号 | 0014-3057 |
| 其他题名 | Eur. Polym. J. |
| 中文摘要 | Symmetrical poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide), PEO-PPO-PEO, triblock copolymers with 80% polyethylene oxide (PEO, the hydrophilic end blocks) and polypropylene oxide (PPO, the hydrophobic middle block) usually remain as molecularly dissolved at ambient temperature even at fairly high-concentrations (2 wt.% or more). However, the micellization is induced at lower concentration/temperature in the presence of salts. The results on salt induced micellization from four such hydrophilic copolymers Pluronic (R) F38, F68, F88 and F108 obtained from several independent techniques are described. FTIR and fluorescence results provide essentially identical critical micelle temperatures (CMTs) showing marked decrease with increase in PPO molecular weight and in the presence of salt. These copolymers were weakly surface active and did not show a clear break point in surface tension concentration plot typical of surfactants. While addition of salt decreases the cloud point, no significant micelle growth was observed even at temperature close to cloud point (CP). Marked increased in solubilization of an oil dye was observed in presence of KC1. Different methods showed good agreement in temperature/salt-induced micellization of these hydrophilic copolymers. (C) 2007 Elsevier Ltd. All rights reserved. |
| 英文摘要 | Symmetrical poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide), PEO-PPO-PEO, triblock copolymers with 80% polyethylene oxide (PEO, the hydrophilic end blocks) and polypropylene oxide (PPO, the hydrophobic middle block) usually remain as molecularly dissolved at ambient temperature even at fairly high-concentrations (2 wt.% or more). However, the micellization is induced at lower concentration/temperature in the presence of salts. The results on salt induced micellization from four such hydrophilic copolymers Pluronic (R) F38, F68, F88 and F108 obtained from several independent techniques are described. FTIR and fluorescence results provide essentially identical critical micelle temperatures (CMTs) showing marked decrease with increase in PPO molecular weight and in the presence of salt. These copolymers were weakly surface active and did not show a clear break point in surface tension concentration plot typical of surfactants. While addition of salt decreases the cloud point, no significant micelle growth was observed even at temperature close to cloud point (CP). Marked increased in solubilization of an oil dye was observed in presence of KC1. Different methods showed good agreement in temperature/salt-induced micellization of these hydrophilic copolymers. (C) 2007 Elsevier Ltd. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Polymer Science |
| 研究领域[WOS] | Polymer Science |
| 关键词[WOS] | DIFFERENTIAL SCANNING CALORIMETRY ; ISOTHERMAL TITRATION CALORIMETRY ; OXIDE) TRIBLOCK COPOLYMERS ; IONIC SURFACTANTS ; BEHAVIOR ; AGGREGATION ; MICELLES ; F127 ; ASSOCIATION |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| WOS记录号 | WOS:000247040600011 |
| 公开日期 | 2013-10-15 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/3418]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 作者单位 | 1.VN S Gujarat Univ, Dept Chem, Surat 395007, India 2.Chinese Acad Sci, Lab Separat Sci & Engn, State Key Lab Biochem Engn, Inst Proc Engn, Beijing, Peoples R China 3.Saga Univ, Fac Sci & Engn, Dept Chem, Saga 8400052, Japan |
| 推荐引用方式 GB/T 7714 | Patel, K.,Bahadur, P.,Guo, C.,et al. Salt induced micellization of very hydrophilic PEO-PPO-PEO block copolymers in aqueous solutions[J]. EUROPEAN POLYMER JOURNAL,2007,43(5):1699-1708. |
| APA | Patel, K..,Bahadur, P..,Guo, C..,Ma, J. H..,Liu, H. Z..,...&Nakashima, K..(2007).Salt induced micellization of very hydrophilic PEO-PPO-PEO block copolymers in aqueous solutions.EUROPEAN POLYMER JOURNAL,43(5),1699-1708. |
| MLA | Patel, K.,et al."Salt induced micellization of very hydrophilic PEO-PPO-PEO block copolymers in aqueous solutions".EUROPEAN POLYMER JOURNAL 43.5(2007):1699-1708. |
入库方式： OAI收割
来源：过程工程研究所
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