Not All Anionic Polyelectrolytes Complex with DTAB
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- 作者：Yuguo Cui ; Robert Pelton ; Terence Cosgrove ; Robert Richardson ; Sheng Dai ; Stuart Prescott ; Isabelle Grillo ; Howard Ketelson ; David Meadows
- 刊名：Langmuir
- 出版年：2009
- 出版时间：December 15, 2009
- 年：2009
- 卷：25
- 期：24
- 页码：13712-13717
- 全文大小：844K
- 年卷期：v.25,no.24(December 15, 2009)
- ISSN：1520-5827
文摘
The influence of hydroxypropyl guar (HPG), with and without boric acid, on dodecyltrimethyl ammonium bromide (DTAB) micellization was characterized by surface tension measurements, isothermal titration calorimetry, and small-angle neutron scattering. Although HPG is a nonionic water-soluble polymer, borate ions form weak bonds with HPG, transforming it into an anionic polyelectrolyte, HPG−borate. Surprisingly, the three independent measurements showed that HPG−borate does not promote DTAB micellization or phase separation normally seen when mixing oppositely charged polyelectrolytes and surfactants. However, the neutron scattering results suggested that HPG−borate binds to and flocculates existing DTAB micelles. The unusual behavior of HPG−borate with DTAB was underscored by showing that carboxymethyl guar (CMG) formed precipitates with DTAB.