AbstractMaster curves in stress relaxation for several samples of poly(vinyl chloride) plasticized by varying proportions of dioctyl phthalate di(2‐ethylhexyl phthalate) are reported and discussed in terms of plasticizer concentration and polymer structure. Modulustemperature curves derived from the data are also shown. Comparisons are given of plasticized compositions of poly(vinyl chloride) and polystyrene. The useful commercial properties of poly(vinyl chloride) are discussed in the light of data on the polymer structure and plasticizer actio
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