Publications - 1988
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Experimental and theoretical investigations on the structure of copolymers at the liquid/liquid interface
T. Cosgrove, L.M. Mallagh Keith Ryan and J.M.H.M. Scheutjens
School of Chemistry, University of Bristol, Bristol, UK
J. Surf. Sci. Technol. (1988), 4(1), 81-90
Abstract
Small-angle neutron scattering was used to study the structure of ethylene oxide-propylene oxide block copolymer and vinyl alc.-vinyl acetate copolymer (I) as nonionic surfactants at liq.-liq. interface in emulsions prepd. by using an aerosol method and by a more conventional high-speed mixing process. For the systems where the continuous and dispersed phases matched scattering densities, it was possible to obtain the segment d. distribution at the interface. For the emulsion stabilized with I, a thick adsorbed layer with a max. in the profile over the interfacial region was found. These observations were in agreement with the predictions of an extended SCF lattice theory of Scheutjents and Fleer to include 3 components and a penetrable interface.
NMR relaxation studies on poly(ethylene oxide) terminally attached at the polystyrene/water interface
Terence Cosgrove and Keith Ryan
Department of Physical Chemistry, University of Bristol, Bristol, UK
J. Chem. Soc., Chem. Commun. (1988), (21), 1424-6
Abstract
NMR spin relaxation studies were used to investigate the concn. histogram of poly(ethylene oxide) terminally attached to polystyrene latex in water. The results are compared with small-angle neutron scattering data.
Polymer desorption by NMR
T. Cosgrove
School of Chemistry, University of Bristol, Bristol, UK
Colloids Surf. (1988), 31 117
Abstract
The time scales in a recent NMR study by C. and J. F. Fergie-Woods (1987) suggest that polymer (polystyrene) desorption at the C/CHCl3 interface requires a longer time than does adsorption. However, the polymer chain must be disentangled from the interface completely before it can be distinguished by NMR during desorption.
The adsorption of random copolymers of vinyl acetate and ethylene on surface-modified silica particles
Terence Cosgrove, Nigel Finch, Brian Vincent and John Webster
School of Chemistry, University of Bristol, Bristol, UK
Colloids Surf. (1988), 31 33-46
Abstract
Adsorption isotherms, bound fraction measurements, and segment d. profiles were obtained for the title copolymer on both silica surface-modified with cyclohexanol or Me3SiCl. The data suggested preferential adsorption of the acetate groups on both silica surfaces. The results were compared qual. with a Monte Carlo simulation. The relative contributions of trains, loops, and tails in these systems were discussed.
Polymers at interfaces
Terence Cosgrove
School of Chemistry, University of Bristol, Bristol, UK
Chem. Ind. (London) (1988), (2), 45-9
Abstract
Review with 25 refs. on the theor. and exptl. approaches to polymer adsorption at the solid-liq. interface. Good qual. agreement between the shape and extent of the adsorbed layer as detd. theor. by the mean field and Monte Carlo simulation and by exptl. techniques was obsd.
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