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Distribution of segments for terminally attached poly(ethylene oxide) chains
Division of Physical Chemistry 1, Chemical Center, University of Lund, Lund, Sweden.
Division of Physical Chemistry 1, Chemical Center, University of Lund, Lund, Sweden.
Division of Theoretical Chemistry, Chemical Center, University of Lund, Lund, Sweden.
1990 (engelsk)Inngår i: Journal of Physical Chemistry, ISSN 0022-3654, Vol. 94, nr 1, s. 471-481Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A theory for describing the equilibrium ethylene oxide (EO) segment distribution for terminally attached poly(ethylene oxide) (PEO) chains is presented. It is based on Scheutjens and Fleer's lattice model for polymer solutions in heterogeneous systems and a two-state model for the EO segments. The two-state model provides one explanation of the solubility gap of homogeneous PEO solutions. The segment distribution is examined as a function of temperature, grafting density, and curvature. The present theory predicts distributions, which cannot be reproduced with the use of temperature-dependent interaction parameters in a one-state model. Specifically, the segments tend to be more accumulated at the surface but also far away from the surface at the expense of the intervening transition region. Calculation on a model of a micelles formed by the nonionic surfactant C 12E 8 supports the experimental conclusions that the EO segments are preferentially accumulated nearby the hydrocarbon core and not completely extended into the water region.

sted, utgiver, år, opplag, sider
1990. Vol. 94, nr 1, s. 471-481
Emneord [en]
Mathematical Models - Iterative Methods, Polymers - Solutions, Probability - Random Processes, Statistical Mechanics - Theory, Thermodynamics - Statistical Mechanics, Equilibrium EO Segment Distribution, Ethylene Oxide (EO), Polyethylene Oxide Chains, Scheutjens Fleer Lattice Model, Segments Internal Degrees of Freedom, Polyethers
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URN: urn:nbn:se:hig:diva-25396Scopus ID: 2-s2.0-0025209002OAI: oai:DiVA.org:hig-25396DiVA, id: diva2:1148029
Tilgjengelig fra: 2017-10-09 Laget: 2017-10-09 Sist oppdatert: 2018-03-13bibliografisk kontrollert

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