Sub-Tg annealing studies of rubber-modified and unmodified epoxy systems

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dc.contributorVirginia Tech. Department of Chemical Engineeringen
dc.contributorPrinceton University. Department of Chemical Engineeringen
dc.contributorWestern Electric. Engineering Research Centeren
dc.contributor.authorOphir, Zohar H.en
dc.contributor.authorEmerson, John A.en
dc.contributor.authorWilkes, Garth L.en
dc.contributor.departmentChemical Engineeringen
dc.date.accessed2015-04-24en
dc.date.accessioned2015-05-05T15:41:58Zen
dc.date.available2015-05-05T15:41:58Zen
dc.date.issued1978en
dc.description.abstractEpoxy network systems based on DGEBA (bisphenol_A_diglycidyl ether) and NMA (nadic methyl anhydride) systems modified with the low molecular weight CTBN (carboxyl_terminated butudiene_acrylonitrile copolymer)rubbers were prepared and studied. It was found that below the glass transition of the epoxy matrix these materials displayed time_dependent changes in their mechanical properties; specifically, the strain to break as well as the rate of stress relaxation were observed to decrease in a near_linear behavior with the logarithm of time at sub_T g annealing. Calorimetric methods clearly showed a simultaneous decrease in enthalpy with time that behaved in a similar fashion as the time_dependent mechanical properties. All the calorimetric and mechanical data are qualitatively related. The importance of this phenomena is considered in view of the widespread use of epoxys. Similar behavior is expected for other network glasses thermally quenched into a nonequilibrium state.en
dc.format.extent8 pagesen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationOphir, Z. H., Emerson, J. A., Wilkes, G. L. (1978). Sub_Tg annealing studies of rubber_modified and unmodified epoxy systems. Journal of Applied Physics, 49(10), 5032-5038. doi: 10.1063/1.324437en
dc.identifier.doihttps://doi.org/10.1063/1.324437en
dc.identifier.issn0021-8979en
dc.identifier.urihttp://hdl.handle.net/10919/52003en
dc.identifier.urlhttp://scitation.aip.org/content/aip/journal/jap/49/10/10.1063/1.324437en
dc.language.isoen_USen
dc.publisherAmerican Institute of Physicsen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAnnealingen
dc.subjectMechanical propertiesen
dc.subjectCopolymersen
dc.subjectElastomeric polymersen
dc.subjectGlass transitionsen
dc.titleSub-Tg annealing studies of rubber-modified and unmodified epoxy systemsen
dc.title.serialJournal of Applied Physicsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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