Accession Number : AD0697310

Title :   STUDIES ON THE STRESS RELAXATION OF POLYSTYRENES IN THE RUBBERY-FLOW REGION.

Descriptive Note : Technical rept.,

Corporate Author : PRINCETON UNIV N J FRICK CHEMICAL LAB

Personal Author(s) : Tobolsky,A. V. ; Narkis,M. ; Hopkins,I. L.

Report Date : OCT 1969

Pagination or Media Count : 27

Abstract : Relaxation modulus curves for monodisperse and polydisperse polystyrenes are compared and the significant effect of molecular weight distribution on these curves is shown. An empirical three-parameter equation is shown to describe well the stress relaxation behavior of monodisperse polystyrenes. New data for high molecular weight monodisperse polystyrenes are presented and used to extend the applicability of previous quantitative relations for higher molecular weights. The stress relaxation technique is shown to be sensitive to the type of plasticizer used at low concentrations. (Author)

Descriptors :   (*STYRENE PLASTICS, *MODULUS OF ELASTICITY), MOLECULAR WEIGHT, PLASTICIZERS

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE