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Effect of Mesogenic Organic Salts on Vulcanization and Physical Properties of Natural Rubber Compounds

Published online by Cambridge University Press:  17 December 2012

F. Avalos ,
M. Tellez-Rosas ,
M.E. Castañeda-Flores ,
F. J. Martínez-Casado ,
J. A. Rodríguez-Cheda ,
M. Arroyo  and
M. A. López-Manchado
F. Avalos
Affiliation:
Universidad Autónoma Coahuila, Facultad de Ciencias Químicas, Saltillo Coahuila, México,
M. Tellez-Rosas
Affiliation:
Universidad Autónoma Coahuila, Facultad de Ciencias Químicas, Saltillo Coahuila, México,
M.E. Castañeda-Flores
Affiliation:
Universidad Autónoma Coahuila, Facultad de Ciencias Químicas, Saltillo Coahuila, México,
F. J. Martínez-Casado
Affiliation:
Instituto Andaluz de Ciencias de la Tierra (IACT), CSIC-UGR, Granada, Spain,
J. A. Rodríguez-Cheda
Affiliation:
Departamento de Química-Física, Fac. CC QQ, Univ. Complutense de Madrid. Madrid, Spain.
M. Arroyo
Affiliation:
Instituto de Ciencia y Tecnología de Polímeros, CSIC, Madrid, Spain,
M. A. López-Manchado
Affiliation:
Instituto de Ciencia y Tecnología de Polímeros, CSIC, Madrid, Spain,
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Abstract

The effect of mesogenic organic salts as reinforcing fillers for natural rubber has been investigated. The influence of cation size (thallium and sodium) and organic chain length (thallium (I) pentanoate and dodecanoate) on the vulcanization parameters, physical and mechanical characteristics and rheological behavior has also been analyzed. In general, the maximum torque of the vulcanizates increases in the presence of the salts and is clearly manifested in a sensible increase in tensile modulus and strength of the composites. The reinforcing effect of these salts is noticeable in the natural rubber matrix. The thallium (I) salts are more effective reinforcements than the sodium salt, and the length of the organic chain hardly has any influence on the mechanical properties. The composites based on the thallium (I) dodecanoate salt show a very peculiar rheological behavior with a “plateau” in the G’ and G” vs temperature graphics which is related with solid phase I, existing between 83.5 ºC and 127 ºC, characterized as a plastic condis phase. This issue is especially interesting for the fabrication of devices such as sensors to control, for instance, the security (resistance of a material) as a function of temperature.

Keywords

Elastic propertiescompositedevices
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1483: Symposium S – New Trends in Polymer Chemistry and Characterization , 2012 , imrc12-1483-s5b-p042
Copyright
Copyright © Materials Research Society 2012 

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References

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