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Plasticized PVC shows a surprising degree of elasticity. The reason is that during processing a gel structure is formed in which plasticizer‐stable PVC microcrystallites serve as nodes for the network. The formation of these microcrystallites and their effects on the flexibility of plasticized PVC are examined by means of differential scanning calorimetry (DSC) and measurement of compression set (C‐set). The C‐set of plasticized PVC below temperatures of roughly 130°C cannot be attributed to irreversible flow processes. It is explained by assuming the superimposition of a network formed during processing on a new network formed under deformation. This model allows a plausible description of the influence of temperature, time, plasticizer content, a quantitatively correct calculation of the C‐set of pre‐deformed specimens and an interpretation of annealing effects on the elastic behavior. It is shown that appropriate pre‐treatment can reduce the C‐set of plasticized PVC to below 50%, even for service temperatures of 70°C and above.
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Torsten Rehm (1997) studied this question.
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