Temperature Calibration in Dielectric Measurements |
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Authors: | J F Mano S Lanceros-Méndez A M Nunes M Dionísio |
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Institution: | (1) Departamento de Engenharia de Polímeros, Universidade do Minho, Campus de Azurém, 4800-058 Guimarães, Portugal;(2) Departamento de Física, Universidade do Minho, Campus de Gualtar, 4710 Braga Codex, Portugal;(3) Departamento de Química, Centro de Química Fina e Biotecnologia, Faculdade de Ci ncias e Tecnologia, Universidade Nova de Lisboa, 2825-114 Monte de Caparica, Portugal |
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Abstract: | Dielectric experiments are often performed in non-isothermal conditions. Thus, there is a difference between the temperature of the sample and the sensor temperature. In this work we propose and compare three temperature calibration methods based on the detection of transitions or relaxations: i) the melting of high-purity metallic standards (indium and tin), ii) the 2nd order phase transition of a ferroelectric crystal (TGS); iii) the -relaxation of an amorphous polymer (poly(carbonate)). The results obtained from the three different methods were used to construct a calibration curve for a given heating rate.This revised version was published online in November 2005 with corrections to the Cover Date. |
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Keywords: | dielectric metallic standards polymer temperature correction TGS TSC |
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