CO₂ Induced Foaming Behavior of Polystyrene near the Glass Transition

Table 1

Models general parameters values.

Parameters	Values	Source
Initial radius of polymer sphere, (mm)	1	Assumed
Initial radius of gas bubble, (mm)	0.01	Measured
Initial pressure, (bar)	24 to 83	Measured
Final pressure, (bar)	1	Measured
Temperature, (°C)	100	Measured
Density of CO2 in bubble, (kmol/m^3)	0.032	Calculated
Surface tension, γ (mNm^−1), at 1 bar and 200°C	27.7	17
Henry’s constant, (bar), at 70°C	1140.0	Extrapolated
Henry’s constant, (bar), at 100°C	1628.2	30