Nonlinear Stress Relaxation of Plasticized Poly(vinyl chloride)

DOI Web Site Web Site 21 References

Search this article

Description

Large deformation, nonlinear stress relaxation behavior was examined for poly(vinyl chloride) in di-isononyl phthalate (PVC/DINP) system having PVC content of 45.5 wt% at 180, 190, and 200°C. The PVC/DINP system exhibited power law type relaxation modulus, G(t, γ) ∝ t-n’, over a wide range of time t. The slope n’ increased with elevating temperature T irrespective of step-strain γ. At 190°C, the n’ value of the system was 0.75 showing a critical gel temperature (Tgel), because 0.75 was in agreement with the values obtained from the linear dynamic viscoelasticity reported previously. Time-strain separability G(t, γ) = G(t)h(γ) is applicable over a wide range of t. Here, G(t) is linear relaxation modulus. The magnitude of damping depended strongly on T. Below Tgel, in other words, in a gel state, h(γ) exhibited very weak strain dependence like cross-linking rubbers. In a critical gel state, the magnitude of damping was a little larger than that for the gel state. Above Tgel, in a sol state, h(γ) showed still more stronger strain dependence similar to branch polymers. It was found that h(γ) of PVC/plasticizer system strongly depended on temperature near Tgel.

Journal

References(21)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top