Accession Number : ADA952731

Title :   The Viscoelastic Properties of Crosslinked Poly(Ethylene Tetrasulfide) III.

Descriptive Note : Technical rept.,

Corporate Author : PRINCETON UNIV N J FRICK CHEMICAL LAB

Personal Author(s) : Tobolsky,A. V. ; Beevers,R. B. ; Owen,G. D. T.

Report Date : AUG 1962

Pagination or Media Count : 26

Abstract : THE VISCOELASTIC PROPERTIES OF POLY(ETHYLENE TETRASULFIDE) CONTAINING 5% OF THE CROSSLINKING AGENT 1,2,3 TRICHLOROPROPANE, HAVE BEEN EXAMINED OVER A WIDE TEMPERATURE RANGE, ESPECIALLY IN THE TRANSITION REGION. THIS EXTENDS THE WORK PREVIOUSLY REPORTED ON THE PREPARATION OF CROSSLINKED POLY(ETHYLENE TETRASULFIDES) AND THEIR PROPERTIES IN THE REGION OF CHEMICAL STRESS RELAXATION. FROM THE RELAXATION CURVES THE MASTER CURVE HAS BEEN CONSTRUCTED AND THE FIRST AND SECOND APPROXIMATION TO THE DISTRIBUTION OF RELAXATION TIMES EVALUATED. THE DATA HAS BEEN FOUND TO FIT QUITE SATISFACTORILY TO A MODIFIED WILLIAMS-LANDEL-FERRY TYPE EQUATION. APPARENT ACTIVATION ENERGIES HAVE BEEN EVALUATED AND SHOW A MARKED TEMPERATURE DEPENDENCE WITH PEAK VALUE OF 207 K CALS MOLE TO THE NEGATIVE FIRST POWER AT -17 DEGREES C. (AUTHOR-PL).

Descriptors :   *Viscoelasticity, *Polyethylene, *Polysulfides, Crosslinking(Chemistry), Chlorides, Propane, Transition temperature, Relaxation time, Approximation(Mathematics), Distribution, Activation energy

Subject Categories : Plastics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE