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Degree

Doctor of Philosophy, Case Western Reserve University, Chemistry, 1995.

Abstract

Nuclear Magnetic Resonance (NMR) spectroscopy has become an extremely effective tool for studying the morphology and molecular dynamics of polymers. The technique, especially ¹³C NMR, is site specific. This means that each resolvable resonance within the polymer may be identified and studied. Additionally the nuclear magnetism, once perturbed by irradiation of a radio frequency pulse, returns to preirradiation equilibrium via relaxation mechanisms that are sensitive to the morphology and molecular dynamics of the system. By studying NMR relaxation behavior one can evaluate the morphology and molecular dynamics of polymers. In this work, solid state ¹³C NMR spectroscopy, in conjunction with Differential Scanning Calorimetry (DSC) and Attenuated Total Reflection (ATR) FTIR, is used to study the effects of water permeation and fluorine substitution on the morphlogy of polyurethane elastomers. The technique in conjunction with Dynamic Mechanical Analysis (DMA), is also used to study the miscibility of polybutadiene (PBD)/polyisoprene (PI) blends. Additionally NMR is used to study the effects of chemical modification on the polymer lattice and carbon black interactions of PBD systems.

Subject Headings

Chemistry, Polymer

Keywords

Nuclear Magnetic Resonance; Elastomers

Advisor

William M. Ritchey

Pages

167p.

Document number: case1058875640
Permalink: http://rave.ohiolink.edu/etdc/view?acc_num=case1058875640

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