Abstract
The glass transition temperatures of polycarbonate (PC) were measured by means of high pressure DSC in He, N 2, and CO 2 atmospheres. It was found that the glass transition temperature ( T g) of PC was independent in He with pressure up to 70 atm, whereas the T g of PC shifted by 6° towards the lower temperature end in N 2 atmosphere when the pressure was 70 atm. The depression in T g by high pressure CO 2 was found to be even more remarkable due to a stronger plasticization effect. It was also found that the glass transition for PC/CO 2 system exhibited an endothermic peak. It was believed that the endothermic behaviour resulted from the excessive desorption of the absorbed gas at T g due to the increase in chain mobility. This conclusion was further confirmed by examining the glass transition behaviour of poly(vinyl benzoate) in CO 2 at 2 atm.
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