Molecular deformation and stress-strain behavior of poly(bisphenol-A-diphenyl sulfone)

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Abstract
Stress-optical studies have been carried out to determine the modes of molecular deformation in poly(bisphenol-A-diphenyl sulfone) and its relationship to stress-strain behavior. Stress and birefringence were measured simultaneously as a function of strain at a strain rate of 0.0133 min−1 in the temperature range −179 to 150 °C. In the temperature range from 150 to −100 °C, measurements were performed using four strain rates, 0.0133 min−1, 0.133, 1.33, and 13.3 min−1 at each testing temperature. The results indicate that the processes involved in the molecular deformation appear to be invariant at temperatures below −100 °C. At higher temperatures, the statistical chain segments participate in the deformation process and the degree of participation increases with increasing temperature. The mechanism controlling the stress-strain response is attributed to chain orientation. The stress-strain response at temperatures below −100 °C is attributed to the temperature dependence of an internal energy contribution associated with conformational changes in the chain segments in response to the applied stress. The observed modest temperature dependence of the stress-strain behavior implies relatively low values for the energy barriers for these conformational rearrangements. The γ transition, which is assigned to the motion of the sulfone group, may be responsible for the conformational rearrangement process.

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