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dc.contributorVirginia Tech. Department of Chemical Engineeringen_US
dc.contributorPrinceton University. Department of Chemical Engineeringen_US
dc.contributorWestern Electric. Engineering Research Centeren_US
dc.contributor.authorOphir, Zohar H.en_US
dc.contributor.authorEmerson, John A.en_US
dc.contributor.authorWilkes, Garth L.en_US
dc.date.accessioned2015-05-05T15:41:58Z
dc.date.available2015-05-05T15:41:58Z
dc.date.issued1978
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: 10.1063/1.324437
dc.identifier.issn0021-8979
dc.identifier.urihttp://hdl.handle.net/10919/52003
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.
dc.format.extent8 pages
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_US
dc.publisherAmerican Institute of Physics
dc.subjectAnnealingen_US
dc.subjectMechanical propertiesen_US
dc.subjectCopolymersen_US
dc.subjectElastomeric polymersen_US
dc.subjectGlass transitionsen_US
dc.titleSub-Tg annealing studies of rubber-modified and unmodified epoxy systemsen_US
dc.typeArticleen_US
dc.identifier.urlhttp://scitation.aip.org/content/aip/journal/jap/49/10/10.1063/1.324437
dc.date.accessed2015-04-24
dc.title.serialJournal of Applied Physics
dc.identifier.doihttps://doi.org/10.1063/1.324437
dc.type.dcmitypeTexten_US


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