A theoretical and experimental study of filler effect on stress-deformation-segmental orientation relations for poly(dimethylsiloxane) networks
Bokobza, Liliane and Erman, Burak (2000) A theoretical and experimental study of filler effect on stress-deformation-segmental orientation relations for poly(dimethylsiloxane) networks. Macromolecules, 33 (23). pp. 8858-8864. ISSN 0024-9297
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Official URL: http://dx.doi.org/10.1021/ma000261t
Results of stress-strain, infrared dichroism, and birefringence experiments on silica-filled poly(dimethylsiloxane) networks show strong upturns of the stress with increasing deformation while segmental-orientation-strain relations remain linear over the same deformation range. As a result of this difference, the stress-optical coefficient exhibits an unusual dependence on deformation. The upturn in the stress results from the limited extensibility of the chains, inferred from the upturns in the Mooney-Rivlin plots presented. To explain these observations from a molecular perspective, we characterized the end-to-end distributions of different length poly(dimethylsiloxane) chains by Monte Carlo isomeric state calculations and derived stress-deformation-orientation relations for networks made of these chains by employing the three-chain network model. The results of the molecular model, in parallel with experimental observation, show strong differences between stress and orientation behavior.
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