Accession Number : ADA307549

Title :   Comparative Rheological and Fracture Properties of Epoxy Resins in the Glass Transition Region,

Corporate Author : MINNESOTA MINING AND MFG CO ST PAUL

Personal Author(s) : Kaelble, D. H.

PDF Url : ADA307549

Report Date : 1960

Pagination or Media Count : 23

Abstract : The rheological and fracture properties of technically and commercially important representatives of three classes of high polymers, elastomer (SBR), thermoplastics (PVC), and thermosetts (epoxy resins) are directly compared in terms of response 'master' functions in the region from glassy state through rubbery state. Application of the time temperature reduced variables treatment reduces the magnitudes of response to thermodynamically equivalent states at 296 K. The rheological time scale of response is reduced to equivalent states of molecular fractional free volume, from a further consideration of reduced variables, fixed by convention at T sub g + 50 K where T is the glass transition temperature of the particular polymer g. The dynamic properties, in terms of the storage modulus and loss tangent and tensile properties, in terms of a relaxation modulus, the true fracture stress and fracture strain are qualitatively compared and discussed from the standpoint of chemical composition and macromolecular architecture. The interrelations between microstrain dynamic properties and macrostrain tensile deformation and fracture properties are identified.

Descriptors :   *POLYMERS, *ELASTOMERS, *FRACTURE(MECHANICS), *TRANSITION TEMPERATURE, *EPOXY RESINS, TENSILE PROPERTIES, RUBBER, CRYSTALLIZATION, GLASS, CHEMICAL COMPOSITION, THERMOPLASTIC RESINS, RHEOLOGY, MACROMOLECULES, THERMOSETTING PLASTICS, POLYVINYL CHLORIDE, VITREOUS STATE.

Subject Categories : Polymer Chemistry
      Plastics
      Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE