Accession Number : AD0630019

Title :   THE EFFECTS OF INTERMOLECULAR FORCES ON POLYMER RHEOLOGY. II. HYDROGEN BONDING ABOVE TG.

Descriptive Note : Research rept.,

Corporate Author : POLYTECHNIC INST OF BROOKLYN N Y

Personal Author(s) : Otocka,Edward P. ; Eirich,F. R.

Report Date : MAR 1966

Pagination or Media Count : 50

Abstract : A series of three butadiene/methacrylic acid copolymers and three butadiene/2-methyl-5-vinyl pyridine copolymers were evaluated for Young's 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 Young's 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)

Descriptors :   (*POLYMERS, MOLECULAR ASSOCIATION), (*RHEOLOGY, POLYMERS), (*MOLECULAR ASSOCIATION, RHEOLOGY), BUTADIENES, ACRYLIC RESINS, VINYL PLASTICS, MODULUS OF ELASTICITY, STRESSES, CHEMICAL BONDS, HYDROGEN, TRANSITION TEMPERATURE, GLASS, FILMS, ABSORPTION SPECTRA

Subject Categories : Plastics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE