LABILE CROSSLINKS IN LOW UNSATURATION ELASTOMERS, II. EFFECT OF CHAIN AND CROSSLINK STRUCTURE ON THERMAL AND OXIDATIVE STABILITY,

Abstract

The thermal and oxidative stability of low unsaturation elastomers was studied as a function of chain and crosslink structure by stress relaxation and oxygen absorption techniques. An ethylene-propylene-terpolymer, a propylene oxide copolymer, and an ethylene sulfide-propylene sulfide-terpolymer were used. The thermally labile polysulfide crosslink that results from sulfur cures is a potent antioxidant. The thermal lability is ascribed to an interchange mechanism, with an activation energy of 24 kcal/mole between 100 and 150C. The presence of an atom of oxygen in the chain results in an increased susceptibility to oxidative degradation compared with a hydrocarbon chain. The presence of a sulfur atom in the polymer chain confers a sensitivity to a destructive attack by the active ingredients and products of an accelerated sulfur curing recipe. (Author)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1968
Accession Number
AD0669497

Entities

People

  • Arthur V. Tobolsky
  • Peter F. Lyons
  • Timothy C. P. Lee

Organizations

  • Princeton University

Tags

DTIC Thesaurus Topics

  • Absorption
  • Acyclic Hydrocarbons
  • Alkenes
  • Antioxidants
  • Chemical Compounds
  • Copolymers
  • Degradation
  • Elastomers
  • Energy
  • Ethylenes
  • Heat Of Activation
  • Hydrocarbons
  • Macromolecules
  • Molecules
  • Polymers
  • Propenes

Readers

  • Organic Chemistry
  • Polymer Science and Engineering.

Technology Areas

  • Microelectronics