Endo- and exothermal mechanocaloric response in rubbers

Matsuo, Takasuke; Takajo, Daisuke

Journal of Thermal Analysis and Calorimetry, 2024

Number of Access:31（2025-05-14 14:38 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/98094

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Title
Endo- and exothermal mechanocaloric response in rubbers
Creator
NRID
1000000028185 1000000028185
CreatorName
Matsuo, Takasuke
NRID
1000050456993 1000050456993
ORCID
0000-0001-6035-9304 0000-0001-6035-9304
researchmap permalink
takajodaisuke takajodaisuke
Scopus Author ID
6506998501 6506998501
CreatorName
Takajo, Daisuke
Subject
Endothermal mechanocaloric effect
Entropy of extension
Exothermal mechanocaloric effect
Ideal rubber
Non-ideal rubber
Rubber elasticity
Description
The version of record of this article, first published in Journal of Thermal Analysis and Calorimetry, is available online at Publisher’s website: https://doi.org/10.1007/s10973-024-13361-8.
Abstract
We investigated mechanocaloric properties of two silicone rubbers using an in-house made apparatus. Tension f and temperature change ΔT of the rubber samples in the form of tapes were measured as they were extended up to a normalized length λ≈2 at a constant rate. Endothermal and exothermal components of the thermal response were observed and separated. The engineering stress and (decrease of) the entropy density derived from the data were analyzed. The number densities of the partial chains and the coefficients of the positive (endothermal) entropy contribution were determined as material constants of the rubbers. Non-idealities were revealed by the large difference between the work done on the rubber for the extension and the heat that evolved in the process. It decreased to a considerable extent when the heat was corrected for the endothermal effect arising from the above-mentioned endothermal entropy contribution. This may be understood as an indication of hidden near-ideality of silicone rubbers. Dissipation of the work into heat is quantified using the difference between the temperature changes on extension and contraction.
Publisher
Springer Science and Business Media B.V.
Source Title
Journal of Thermal Analysis and Calorimetry
Date of Issued
2024-07-31
Language
English
Handle URL
https://hdl.handle.net/11094/98094
PISSN
13886150
eISSN
15882926
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1007/s10973-024-13361-8
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article