Pressure‐volume‐temperature studies of a polyurethane elastomer

摘要

Experimental pressure‐volume‐temperature data for a polyurethane elastomer aboveTgare fitted to equation of state theories. The cell and hole theories, as applied to polymer liquids, both represent the data fairly well for appropriate choices ofP*,V*, andT*; the characteristic pressure, volume, and temperature scaling parameters, respectively.P*,V*, andT* are found to obey a semiempirical equation which holds for a large number of polymers, and, by fitting the data to the hole theory it is found that the hole fraction, 1−y, can be used as an ordering parameter to describe the pressure dependence ofTg.