Thermophysical characterization of glassy, cross-linked heterocyclic polymers
| Autor: | V. Yu. Kramarenko, V. P. Azarenkov, A. V. Baibak, V. P. Privalko |
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| Rok vydání: | 1994 |
| Předmět: |
chemistry.chemical_classification
Range (particle radiation) Materials science Enthalpy Analytical chemistry Polymer Epoxy Condensed Matter Physics Heat capacity Characterization (materials science) chemistry.chemical_compound Thermal conductivity chemistry visual_art visual_art.visual_art_medium Hexamethylene diisocyanate Physical and Theoretical Chemistry Composite material Instrumentation |
| Zdroj: | Thermochimica Acta. 238:417-427 |
| ISSN: | 0040-6031 |
| DOI: | 10.1016/s0040-6031(94)85222-7 |
| Popis: | An automated, computer-interfaced system was built and used for the characterization of the glassy state of a series of heterocyclic network polymers based on epoxy resin (ER) and hexamethylene diisocyanate (HMDI), using precise measurements of heat capacity and thermal conductivity in the temperature interval 80–315 K. The absolute values of both C p and λ exhibit only moderate dependence on the network structure expressed by the MHDI/ER molar ratio. Moreover, no evidence for enthalpy relaxations in the range of temperatures studied is found from the heat capacity data for all samples, and in the intermediate temperature interval (120–220 K) the values of thermal conductivity for the sample with an HMDI/ER ratio of 80 20 passes through a shallow minimum which is tentatively attributed to the enthalpy-invariant motion of specific packing defects (“holes”) in the glassy matrix. |
| Databáze: | OpenAIRE |
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