Strain rate dependence in plasticized and un-plasticized PVC

M.J Kendall,C.R Siviour

doi:10.1051/epjconf/20122602009

Abstract

An experimental and analytical investigation has been made into the mechanical behaviour of two poly (vinyl chloride) (PVC) polymers – an un-plasticized PVC and a diisononyl phthalate (DINP)-plasticized PVC. Measurements of the compressive stress-strain behaviour of the PVCs at strain rates ranging from 10−3 to 103 s−1 and temperatures from − 60 to 100∘ C are presented. Dynamic Mechanical Analysis was also performed in order to understand the material transitions observed in compression testing as the strain rate is increased. This investigation develops a better understanding of the interplay between the temperature dependence and rate dependence of polymers, with a focus on locating the temperature and rate-dependent material transitions that occur during high rate testing.

Highlights

The mechanical properties of polymers are studied because of their widespread scientific and industrial importance, as seen in the automotive, aerospace, military, and medical industries
This paper investigates the high strain rate mechanical behaviour of two polymers, un-plasticized poly(vinyl chloride) (PVC) (PVC) and a diisononyl phthalate (DINP)-plasticized PVC
The stress-strain behaviours of PVC and PPVC under uniaxial compression are presented in figures 1 and 2

Summary

Introduction

The mechanical properties of polymers are studied because of their widespread scientific and industrial importance, as seen in the automotive, aerospace, military, and medical industries. Most polymers exhibit time dependent mechanical behaviour, as evidenced by rate-dependent elastic moduli, yield strength and post-yield behaviour. This rate and temperature sensitivity is seen to change in different temperature and rate regimes (with sensitivity increasing at higher rates of strain) depending on different molecular mobility mechanisms being activated. The increased strength in more rubbery or elastomeric polymers is accounted for by the change in molecular mobility during the glass-transition (or α-transition). These transitions are usually seen within polymers at lower temperatures, but can be shifted in temperature by changes in strain rate, as the transition increases in temperature with increasing strain rate [1, 2, 5, 6]

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Discussion

Conclusion