Table 1.

Material properties and parameters of PMMA (Plexiglas RV825).

Material properties	Values	Tait PVT model	Values
Transition temperature (°C)	101	b1l (cc/g)	0.85982
Density (g/cm3)	1.172	b1s (cc/g)	0.860702
Refractive index	1.489	b2l (cc/g · K)	0.0005697
Luminous transmittance	92%	b2s (cc/g · K)	0.0001995
Water absorption (24 h immersion)	0.3%	b3l (dyne/cm2)	2.09×109
Viscosity Cross-WLF model	Values	b3l (dyne/cm2)	2.73×109
n	0.21	b4l (1/K)	0.0049083
r* (dyne/cm2)	1.48×106	b4l (1/K)	0.003394
B (g/cm · s)	1×10−16	b5 (K)	383
Tb (K)	24294	b6 (cm2 · K/dyne)	2×10−8
		C	0.0894