Publications - 1981
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The configuration of adsorbed polymers at the solid-solution interface
Terence Cosgrove, Trevor L. Crowley, Brian Vincent, Kenneth G. Barnett and Tharwat F. Tadros
School of Chemistry, University of Bristol, Bristol, UK
Faraday Symp. Chem. Soc. (1981), (16), 101-8
Abstract
Small-angle neutron scattering and pulsed NMR were used to investigate the configuration of adsorbed polymers at the solid-soln. interface. The segment d. of the adsorbed polymer normal to the interface and the bound fraction were obtained for phys. adsorbed poly(vinyl alc.) and terminally anchored poly(ethylene oxide) on deuterated polystyrene latex. The results agree qual. with theor. predictions of adsorbed polymer and tail configurations.
A variable-frequency pulsed external NMR lock
T. Cosgrove, R. A. Jarvis and D. S. Sissons
School of Chemistry, University of Bristol, Bristol, UK
J. Magn. Reson. (1981), 45(2), 254-6
Abstract
A simple variable-frequency pulsed external NMR lock for stabilizing static magnetic fields is described.
The measurement of the polymer-bound fraction at the solid-liquid interface by pulsed nuclear magnetic resonance
K.G. Barnett, T. Cosgrove, B. Vincent, M. Cohen-Stuart and D.S. Sissons
School of Chemistry, University of Bristol, Bristol, UK
Macromolecules (1981), 14(4), 1018-20
Abstract
Pulsed NMR techniques were used to est. the bound-polymer fraction at solid surfaces in both aq. and nonaq. dispersions [poly(vinylpyrrolidinone) -SiO2 and polystyrene -carbon black]. The data were consistent with ests. of the strength of the polymer-substrate interactions. Spectra were also obtained for a terminally anchored polymer.
Neutron scattering, nuclear magnetic resonance, and photon correlation studies of polymers adsorbed at the solid-solution interface
K.G. Barnett, T. Cosgrove, B. Vincent, A.N. Burgess, T.L. Crowley, T. King,
J.D. Turner and T.F. Tadros
Department of Physical Chemistry, University of Bristol, Bristol, UK
Polymer (1981), 22(3), 283-5
Abstract
Small-angle neutron scattering, NMR, and photon correlation spectroscopy were used to study poly(ethylene oxide) adsorbed on polystyrene latex dispersed in H2O. The values of the 2nd moment of the segment d. distribution for the adsorbed polymer, the hydrodynamic thickness of the adsorbed layer, and the fraction of segments in contact with the surface were measured exptl. The results were self-consistent and indicated a weakly adsorbed polymer layer with a few segments in phys. contact with the latex surface.
Driven equilibrium solid and liquid spin-echo NMR sequences
T. Cosgrove and K.G. Barnett
School of Chemistry, University of Bristol, Bristol, UK
J. Magn. Reson. (1981), 43(1), 15-20
Abstract
Several new versions of driven equil. pulsed NMR expts. were developed to measure the relaxation times of polymers adsorbed on solid surfaces from soln. In particular these sequences enable the sepn. of signals resulting from 2 phases, one with strong dipolar coupling (a solid) and one with very weak dipolar coupling (a liq.) in systems with large unwanted solvent signals.
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