Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 53: Issue 1
Evaluation of the Compatibility of EPDM and IIR I. Specific heat capacity
Authors:
T. Zaharescu R & D Institute for Electrical Engineering 313 Splaiul Unirii P.O. Box 104 Bucharest 74204 Romania 313 Splaiul Unirii P.O. Box 104 Bucharest 74204 Romania

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V. Meltzer University of Bucharest Faculty of Chemistry 13 Carol I Av. Bucharest 70346 Romania 13 Carol I Av. Bucharest 70346 Romania

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R. Vilcu University of Bucharest Faculty of Chemistry 13 Carol I Av. Bucharest 70346 Romania 13 Carol I Av. Bucharest 70346 Romania

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D. Oprea Colibasi ICN Pitesti 0300 Pitesti Romania 0300 Pitesti Romania

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Pages:
255–262
Online Publication Date:
03 Nov 2004
Publication Date:
01 May 1998
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010156729525
Keywords:
EPDM; IIR; polymer blends; specific heat capacity
Restricted access

Abstract  

The thermal effect of mixing of EPDM and IIR was studied by differential scanning calorimetry over the temperature range between 335 and 435 K. O'Neill's method was used for calculating the specific heat capacity with alumina as standard. The greater the butyl rubber content, the lower the heat capacity. The presence of butyl rubber induces a marked thermal instability because of isobutylene units. It is possible that a rearrangement occurs in the molecular sequence, accompanied by secondary reactions involving free radicals. The contribution of each component to the cP of the tested polymeric systems is discussed. Differences between theoretical and experimental specific heat capacities increase as the operation temperature is raised. The relationship between the contributions of the two components to the specific heat capacity values of mixtures can be described by a first order equation, named the law of reciprocal thermal affinity. This aspect can be ascribed to the interaction of various reacting entities, which form certain units with low molar heat capacity.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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