ISSN:
1435-1536
Keywords:
Dilatometer
;
inhomogeneous deformation
;
gas adsorption
;
elastomers
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Measurements in a gas dilatometer on carbon-black filled rubber cross-linked with sulfur show a large pressure drop in the specimen chamber, which to a large extent cannot be explained by a volume change of the specimen. The extension ratio at which the pressure starts to fall depends on the carbon-black content. Comparative measurements in a deformation calorimeter show that crystallisation always begins first at higher strains. It is assumed that the investigated specimens are inhomogeneously deformed even at small strains, depending on the carbon-black content, and that internal voids are formed, onto the surfaces of which gas molecules are deposited. This gas adsorption causes the pressure drop measured in the dilatometer; it is dependent on the nature of the gas. Argon shows no interaction with internal surfaces in the specimen; for measurements in an argon atmosphere, volume increases and strain-induced crystallisation can be properly determined. It is presumed that strain-induced crystallisation sets in earlier for specimens with larger carbonblack content, corresponding to the more inhomogeneous character of the deformation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01410385
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