Accession Number : ADA132250

Title :   Aging of Polymeric Materials.

Descriptive Note : Final rept. 30 Sep 81-31 Dec 82,

Corporate Author : MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO

Personal Author(s) : Wolf,C J ; Grayson,M A ; Fanter,D L

PDF Url : ADA132250

Report Date : 31 Dec 1982

Pagination or Media Count : 74

Abstract : Changes in the microchemistry of the MY720/diaminodiphenyl sulfone epoxy resin system were investigated as a function of simulated environmental aging. Chemiluminescence (CL) was used to monitor changes in the resin system, samples of which were aged at 35 and 65 C at 0% RH (relative humidity), 100% RH, or immersed in liquid water. The reciprocal of the CL is a linear function of the aging interval. The low-temperature thermal decomposition of the cured resin was investigated from 125 to 215 C. The primary decomposition product was propenal. Several other aldehydes were observed; however, they are formed during cure and are not thermal decomposition products. The apparent activation energy for the production of propenal is 67 kJ/mole (16 kcal/mole). Possible mechanisms for the source of this compound are discussed.

Descriptors :   *Epoxy resins, *Aging(Materials), *Test methods, Simulation, Weathering, Exposure(General), Microanalysis, Chemical analysis, Chemiluminescence, Chemical reactions, Mechanical properties, Decomposition

Subject Categories : Polymer Chemistry
      Test Facilities, Equipment and Methods
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE