Calibration of cyclohexane solid-solid phase transition thermoporosimetry and application to the study of crosslinking of elastomers upon aging |
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| Authors: | M Baba J-M Nedelec J-L Gardette |
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| Institution: | a Laboratoire de Photochimie Moleculaire et Macromoleculaire, UMR CNRS 6505, Ecole Nationale Supérieure de Chimie de Clermont Ferrand et Université Blaise Pascal, Bat. Chimie 3, 24 Av. des landais 63174 Aubière cedex, France
b Laboratoire des Matériaux Inorganiques, UMR CNRS 6002, Ecole Nationale Supérieure de Chimie, de Clermont Ferrand et Université Blaise Pascal, 24 Av. des landais 63174 Aubière cedex, France |
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| Abstract: | Photo-aging of elastomers results in two competitive processes: chain- scissions and crosslinking. The solid-to-solid cyclohexane phase transition was used to investigate the crosslinking extent in photo-oxidised ethylene propylene diene monomer (EPDM) samples by thermoporosimetry technique. Before apply this technique to EPDM, texturally well-known silica gel samples were used to calibrate the method. By contrast to the case of liquid-to-solid heptane transition, no linear relationship was obtained between the solid-to-solid point depression (ΔT) and the pore radius (Rp). The following correlation was obtained: |
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| Keywords: | P290 P130 |
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