J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 217-223
High-rate thermomechanical behavior of poly(vinyl chloride) and plasticized poly(vinyl chloride)A.D. Mulliken, S.Y. Soong, M.C. Boyce and R.E. Cohen
Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, USA
Published online: 26 July 2006
A combined experimental and analytical investigation was carried out in order to develop predictive capabilities for the rate-dependent behavior of poly(vinyl chloride) (PVC) and a dioctyl phthalate (DOP)-plasticized PVC, with focus on predicting the thermo-mechanically coupled behavior under high rates of deformation. The two materials were studied experimentally using both dynamic mechanical analysis (DMA) and compression testing over a wide range of strain rates (10 - 4 s - 1 to 2000 s - 1). DMA testing revealed both an -transition and a low-temperature -transition (-56C) in the neat PVC; the incorporation of 20wt% DOP in PVC reduced the -transition temperature by 54C, and also suppressed the -transition peak. In compression testing, rate-sensitivity transitions were observed in both the neat PVC and the PVC-20wt% DOP compound. The transition in PVC is attributed to the shift of the -transition, whereas the transition in the 20wt% DOP blend is due to the rubbery-to-glassy transition as the deformation rate goes from low to high. A constitutive model for the finite strain deformation of amorphous polymers, introduced elsewhere [1,2] and tailored here for the two material systems of interest, is shown to capture the large deformation stress-strain behavior at all rates tested.
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