The effect of densification on the mechanical properties of amorphous glassy polymers

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Abstract
Four polymers, viz. polystyrene, polycarbonate, poly(methyl methacrylate), and poly‐(vinyl chloride), were cooled from the melt to room temperature under hydrostatic pressures of 30 and 1000 atm. Cooling under high pressure increased the density by 0.4–0.6%, and the effect of this has been examined for the torsional creep properties, the dynamic properties at 1 Hz, the Charpy impact strength, the thermal expansivity, and the torsional yield stress. It turned out that, in general, densification affects the thermomechanical properties only slightly.