REICHERT, WF and GORITZ, D (1993) GAS-ADSORPTION AT UNIAXIAL DEFORMATION OF FILLED NATURAL-RUBBER. RUBBER CHEMISTRY AND TECHNOLOGY, 66 (1). pp. 1-13. ISSN 0035-9475,
Full text not available from this repository.Abstract
Deformation dilatometers are used to measure the volume change of a sample during a deformation process. The sample is stretched in a sealed chamber and consequently a volume change of this specimen creates a pressure difference respective to a reference chamber. The conversion of the relative pressure change to a relative volume change is possible in the case no interaction takes place between the measurement medium and the sample. Liquids like mercury, silicone fluid, or diethylene glycol fullfill this assumption. On the other hand, gases used as measurement medium exhibit serious consequences on the registrated pressure change. Gas adsorption seems to be a plausible explanation for these effects. Cyclic deformation of a filled specimen shows that all adsorption places are formed during an initial deformation. Furthermore, TEM and ESI give insight into the morphology and the spatial distribution of the adsorbed nitrogen and oxygen. According to the model of inhomogeneous deformation, which is well represented by the observed morphology change of stretched, filled samples, one can calculate the increase of inner surfaces. The fitting parameters, describing the experimental data, are directly proportional to the filler content of the samples investigated here. All in all, we assume that the inhomogeneous deformation initiates the formation of inner surfaces which provide adsorption places for ambient gases. In addition to that, it points out that the measured volume effects of deformed samples have to be discussed in consideration of the applied medium. For example, gas adsorption causes an additional pressure decrease in the measurement chamber if air is used as the measurement medium.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VOLUME; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/54104 |
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