Accession Number : ADA952754

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

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 : JUN 1962

Pagination or Media Count : 27

Abstract : Stress relaxation studies were made on poly(ethylene tetrasulfide) crosslinked during the polymerization reaction by the use of trifunctional organic chloride. At very low crosslink densities a certain amount of stress-relaxation due to chain slippage occurred. Over the middle range of crosslinking density stress-relaxation was due to tetrasulfide bond interchange exclusively, and these samples followed maxwellian decay of stress. The specific rate constant for bond interchange (K) is given by K = 5.86 x 10 to the 12th power (exp - 25900/RT). The value of the activation energy obtained is discussed in the light of the various energy values reported for the scission of sulfur-sulfur bonds in sulfur chains and rings. (Author-PL).

Descriptors :   *Viscoelasticity, *Chemical bonds, *Elastomers, *Polymers, *Synthetic rubber, *Vulcanizates, Chlorides, Copolymerization, Activation energy, Polyethylene, Polysulfides, Molecular structure, Polymerization, Crosslinking(Chemistry), Reaction kinetics, Stress relaxation, Density, Sulfur

Subject Categories : Elastomers and Rubber
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE