Title: Evaluation of the glass transition temperature of EPDM using a dynamic mechanical analyser

Authors: Daeho Kim; Sungjun Lee; Suyong Kwon

Addresses: Thermometry and Fluid Flow Metrology Group, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon, 34113, South Korea ' Thermometry and Fluid Flow Metrology Group, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon, 34113, South Korea ' Thermometry and Fluid Flow Metrology Group, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon, 34113, South Korea; Department of Measurement Science, University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, South Korea

Abstract: The glass transition temperature characteristics of polymer materials as a function of temperature are very important issues in sealing between various components. It is essential to establish techniques and measurement procedure to evaluate their thermo-mechanical properties. In this study, the glass transition temperature evaluation procedure and experimental results of the ethylene propylene diene monometer (EPDM), a highly functional special synthetic rubber, are discussed using a dynamic mechanical analyser (DMA). The relative standard uncertainties of repeatability and reproducibility in the glass transition temperature measurement of EPDM were evaluated by extrapolation method of the sample heating rate according to the ISO standards. For commercial EPDM, 10 specimens in the same batch were processed in vertical and horizontal directions to measure the reproducibility of the glass transition temperature measurement. The relative standard uncertainties for the repeatability and reproducibility of the glass transition temperature were 1.4% and 1.7%, respectively. In addition, the glass transition temperature was measured for 5 types of samples while increasing the addition of plasticiser to the EPDM samples (from 0 phr to 40 phr). As the addition of plasticiser increased, the glass transition temperature decreased by 75% effectively. In conclusion, T_g evaluation can be performed well in a very low temperature range (about -70°C) using DMA, which is a temperature range that corresponds to the use range of polymer materials applied in industry.

Keywords: dynamic mechanical analyser; glass transition temperature; ethylene propylene diene monometer; plasticiser.

DOI: 10.1504/IJNT.2024.137419

International Journal of Nanotechnology, 2024 Vol.21 No.3, pp.197 - 203

Published online: 18 Mar 2024 *

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