Study on interface and solution properties of dodecyl ethoxylate with different oxyethylene distribution = 에틸렌 옥사이드 부가분포에 따른 도데실 에톡실레이트의 계면 및 수용액 특성에 관한 연구

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The solution and interfacial properties of dodecyl ethoxylates with different polydispersity has been studied by static and dynamic surface tensions, aggregates and scattering factors. The hydrotalcyte-type catalyst was used to study reaction of narrow range dodecyl ethoxylate. Four dodecyl 7 ethoxylates with different oxyethylene distribution (Pure-7, NRE-7, BRE-7, and xBRE-7) were investigated at air-water interface by static and dynamic surface tension. The solution properties such as aggregation number, hydrophobicity, micelle size and shape were also studied using various methods. The model fitting was done to obtain quantitative information from SANS data. The methyl-capped dodecyl 7 ethoxylate was synthesized to investigate the synergistic effect of mixed micelle between nonionic surfactant and dodecylbenzenesulfonate. The narrow range distribution of dodecyl ethoxylate was obtained from the catalytic reaction where the catalyst was synthesized using magnesium oxide and aluminum nitrate. The higher acid strength and the more acid site of catalyst were, the faster reaction rate was. The catalytic site for reaction was also active in formation of by-product, PEG, although it was undesirable. The distribution of ethoxylate with NRE catalyst became much narrower than that of BRE catalyst. The PDI deceased with increasing aluminum content. All the interfacial properties such as CMC, head group area and dynamic decay were influenced by oxyethylene distribution. The CMC and the cross-sectional surface areas of LAE-7 decreased linearly as polydispersity index increased. The chain length of oxyethylene at the surface became shortened remarkably with increasing polydispersity index because of preferential adsorption of short oxyethylene chain although the limiting areas from the P - A isotherm changed a little. The shortest chain length at the surface was attained at room temperature. The dynamic surface tension increased at the creation stage of surface, whil...
Advisors
Kim, Jong-Dukresearcher김종득researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2002
Identifier
174536/325007 / 000965369
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2002.2, [ xii, 134 p. ]

Keywords

distribution; tension; ethoxylate; dodecyl; micelle; 마이셀; 분포; 에톡실레이트; 도데실; 표면장력

URI
http://hdl.handle.net/10203/28884
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=174536&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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