THE EFFECTS OF INTERMOLECULAR FORCES ON POLYMER RHEOLOGY. II. HYDROGEN BONDING ABOVE TG.
POLYTECHNIC INST OF BROOKLYN N Y
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A series of three butadienemethacrylic acid copolymers and three butadiene2-methyl-5-vinyl pyridine copolymers were evaluated for Youngs modulus and stress relaxation modulus between -75C and 75C. Corresponding members of the acidic and basic copolymer series were stoichiometrically combined to provide an intermolecularly hydrogen bonded material which was tested in the same manner. Comparison between the observed modulustemperature curves for the mixed material and the average of the parent materials modulus-temperature curve reveals a regular, temperature dependent increase in Youngs modulus above Tg. Below Tg the rate of increase decreases. The stress relaxation curves of the acidic, basic and mixed copolymers were normalized with respect to Tg. The curves were then differentiated to provide relaxation spectrum curves. The comparison of the average relaxation spectrum curves for the parent materials with that obtained for the mixed material shows depression of short time relaxation mechanisms. Infrared investigations of the hydrogen bond absorptions in stretched films are also discussed. Author
- Atomic and Molecular Physics and Spectroscopy