Accession Number : ADA304711

Title :   Toughening Mechanism in Elastomer-Modified Epoxy Resins. Part 2.

Descriptive Note : Contractor rept. 1 Jul 82-30 Aug 83,

Corporate Author : GENERAL ELECTRIC CO SCHENECTADY NY

Personal Author(s) : Yee, A. F. ; Pearson, R. A.

PDF Url : ADA304711

Report Date : DEC 1984

Pagination or Media Count : 56

Abstract : The role of matrix ductility on the toughenability and toughening mechanism of elastomer-modified DGEBA epoxies was investigated. Matrix ductility was varied by using epoxide resins of varying epoxide monomer molecular weights. These epoxide resins were cured using 4,4' diaminodiphenyl sulfone (DDS) and, in some cases, modified with 10% HYCAR(R) CTBN 1300X8. Fracture toughness values for the neat epoxies were found to be almost independent on the monomer molecular weight of the epoxide resin used. However, it was found that the fracture toughness of the elastomer-modified epoxies was very dependent upon the epoxide monomer molecular weight. Tensile dilatometry indicated that the toughening mechanism, when present, is similar to the mechanism found for the piperidine cured epoxies in Part 1. SEM and OM corroborate this finding. jg p6

Descriptors :   *ELASTOMERS, *TOUGHNESS, *EPOXY RESINS, POLYMERS, TENSILE PROPERTIES, MOLECULAR WEIGHT, MATRIX MATERIALS, FRACTURE(MECHANICS), ORGANIC COMPOUNDS, MONOMERS, DUCTILITY, GLYCIDYL ETHER, PHENYL RADICALS, SULFONES, DILATOMETERS, PIPERIDINES.

Subject Categories : Plastics
      Organic Chemistry
      Elastomers and Rubber
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE