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

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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 kcalmole 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

Author(s):
Lyons, Peter F. ; Lee, Timothy C. P. ; Tobolsky, Arthur V.
Author Organization(s):
PRINCETON UNIV N J FRICK CHEMICAL LAB
Pagination:
0035

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
ONR-TR-RLT-106
Contract/Grant Number(s):
N00014-67-A-0151
Project Number(s):
NR-056-377
Monitor Series:
TR-RLT-106
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*ELASTOMERS, *CROSSLINKING(CHEMISTRY)), POLYETHYLENE PLASTICS, EPOXY RESINS, SULFIDES, POLYMERS, COPOLYMERIZATION, OXIDATION, THERMAL STABILITY, HEAT OF ACTIVATION, VULCANIZATION
Field(s)/Group(s):
Polymer Chemistry
Keyword(s):
ETHYLENE SULFIDE POLYMERS, POLYSULFIDE POLYMERS, PROPYLENE SULFIDE POLYMERS, PROPYLENE OXIDE POLYMERS
Report Date:
1968 Apr 01