Solvency effects on polymer-surfactant interactions

0044 English OPEN
Hirst, Natasha Clare;
  • Subject: QD

Surfactants and polymers have extensive uses and applications in day to day life as detergents, cosmetics, and paints, and in industry, medicine and pharmaceuticals. Gaining a comprehensive understanding of the properties and functions of surfactant and polymer systems ... View more
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    E f f e c t o f E t h a n o l o n t h e I n t e r a c t i o n b e t w e e n P o l y ( v i n y l p y r r o l i d o n e ) a n d S o d i u m D o d e c y l S u l f a t e P. C. G riffith s ,* * N. H ir s t,1 A. P a u l,+ S. M . K in g ,* R. K. Heenan,* and R. Farley* School o f Chemistry, C a rd iff University, P.O. Box 912, C a rd iff C F 10 3TB, U.K., and IS IS Facility, R utherford Appleton Laboratory, Chilton, Didcot 0 X 1 1 OQX, U.K. Received M arch 12, 2004. In F in a l Form : M a y 13, 2004 m icelle surface; th e aggregation n um ber and th e h ydrocarbon core in con tact w ith th e aq u eou s p h a se both d ecrease. T he closer p roxim ity o f th e h ead grou p s m ea n s th a t th e steric term s in crease, b u t th is is a m uch sm a ller effect. In th e p resen ce o f P V P, c m c (l) is low er th a n th e cm c, but th is q u a n tity and th e aggregation num ber are both in v a ria n t w ith eth an ol con ten t. H ow ever, w ith in crea sin g eth a n o l con ten t, th e polym er conform ation in crea sin g ly a tta in s a conform ation m ore rem in iscen t o f th e n o-S D S and n o-eth an ol ca ses, w hich w ould su g g est th a t th e a rea o f th e su rfacta n t core “occluded” by th e polym er d ecreases. T h is is com p en sated by th e adsorption o f eth a n o l in to th e p a lisa d e la y er but w ith no sig n ifica n t ch an g e in th e aggregation n um ber or counterion binding.

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