Hydrogen-Bonding-Induced Complexation of Polydimethylsiloxane-graft-poly(ethylene oxide) and Poly(acrylic acid)-block-polyacrylonitrile Micelles in Water
Publication in refereed journal

香港中文大學研究人員
替代計量分析
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其它資訊
摘要Polydimethylsiloxane-graft-poly(ethylene oxide) (PDMS-g-PEO) copolymers form micelles in water with PDMS as the core and PEO as the corona The introduction of poly(acrylic acid)-block-polyacrylonitrile (PAA-b-PAN) block copolymers in water leads to the formation of micellar complexes due to the hydrogen bonding between carboxyl groups and ether oxygens among the PAA and PEO chains in the corona of the micelles The effects of pH, molar ratios (l) of PAA/PEO, and the standing time on the directly mixing these two micelles in water have been investigated using laser light scattering (LLS) and transmission election microscopy (TEM) Our results showed that the complexation between PAA and PEO in the corona was greatly enhanced at a pH below 35 For a fixed pH value, the interactions between these two micelles in water were governed by the value of r At r < similar to 0 6, mixing the two micelles in water resulted in a large floccule because the smaller PAA-b-PAN micelles act as physical cross-links, which are absorbed onto one PDMS-g-PEO micelle and simultaneously bonded to PEO chains on the other micelles, forming bridges and causing flocculation At similar to 0 6 < r < similar to 1 2, the mixing led to stable micellar complexes with a layer of PAA-b-PAN micelles absorbed onto the initial PDMS-g-PEO micelles. At r > similar to 1 2, the resultant micellar complexes first remained stable, but they precipitated from solution after a long time standing
著者Hu AJ, Cui YS, Wei XL, Lu ZJ, Ngai T
期刊名稱Langmuir
出版年份2010
月份9
日期21
卷號26
期次18
出版社AMER CHEMICAL SOC
頁次14502 - 14508
國際標準期刊號0743-7463
電子國際標準期刊號1520-5827
語言英式英語
Web of Science 學科類別Chemistry; Chemistry, Multidisciplinary; CHEMISTRY, MULTIDISCIPLINARY; Chemistry, Physical; CHEMISTRY, PHYSICAL; Materials Science; Materials Science, Multidisciplinary; MATERIALS SCIENCE, MULTIDISCIPLINARY

上次更新時間 2021-25-02 於 00:51