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首页> 外文期刊>journal of applied polymer science >Determination of glass transition temperature from viscosity and conductivity measurements for an epoxy–amine system during curing
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Determination of glass transition temperature from viscosity and conductivity measurements for an epoxy–amine system during curing

机译：Determination of glass transition temperature from viscosity and conductivity measurements for an epoxy–amine system during curing

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AbstractThe melt viscosity and the direct current (dc) conductivity have been investigated for three bisphenol‐A novolac‐type epoxide oligomers (PGEBANs) that have some branching in each molecule in comparison with the diglycidyl either of bisphenol‐A (DGEBA) oligomer without branching. The novolac‐type PGEBAN oligomer has an experimental relationship between the melt viscosity (η) and the dc conductivity (σ), σ.ηk= const, which is the same form observed for the DGEBA oligomer. The exponentkhas a linear relationship with the glass transition temperature (Tg) for the two types of oligomers with and without branching. TheTgdependence ofkfor the epoxide oligomers was used to analyze theTgof a DGEBA—amine system that had some degree of branching in the molecule based on the bisphenol‐A structure. TheTgof the DGEBA—amine system, which was calculated from thekthat had been nondestructively determined from the viscosity and the conductivity measurements, was consistent with theTgexperimentally measured by differential scanning calorimetry (DSC). © 1993 Jo

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