Accession Number : AD0765765

Title :   Isothermal Transitions of a Thermosetting System.

Descriptive Note : Technical rept.,

Corporate Author : PRINCETON UNIV N J DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Gillham,J. K. ; Benci,J. A. ; Noshay,A.

Report Date : AUG 1973

Pagination or Media Count : 24

Abstract : A study of the curing reactions of a cycloaliphatic epoxide/anhydride system by torsional braid analysis showed the existence of two critical isothermal temperatures. Two rheologically active kinetic transitions occur during isothermal cure which correspond to gelation and vitrification. Three types of isothermal behavior occur. Methods for determining the time to gel and the time to vitrify have been developed. The time to gel obeyed the Arrhenius relationship from which an activation energy was calculated. (Modified author abstract)

Descriptors :   (*EPOXY RESINS, *PHASE STUDIES), (*THERMOSETTING PLASTICS, PHASE STUDIES), GELS, AGING(MATERIALS), POLYESTER PLASTICS, MECHANICAL PROPERTIES, TEMPERATURE, REACTION KINETICS

Subject Categories : Physical Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE