ORIENTATION IN UNIAXIALLY DRAWN POLYSTYRENE PLASTICIZED BY CO2 SORPTION

Uniaxial drawing experiments of the polystyrene films plasticized by a sorption of compressed CO2 gas at pressures up to about 18 MPa were c arried out with strain rates epsilon of 0.0290 and 0.0079 s(-1). The d rawing was performed successfully with draw ratio lambda up to 4 at th e temperatures of 308.15, 318.15, 328.15, and 338.15 K. The Hermans or ientation function f of the drawn samples was determined from the dich roic ratio measured by an infrared spectrophotometer. While f value in creases with increasing epsilon or lambda, it decreases with increasin g CO2 pressure or temperature. (C) 1995 John Wiley and Sons, Inc.