Spectroscopic determination of the optical constants and radiative properties of black PMMA for pyrolysis modeling

In-depth radiation absorption significantly affects the ignition time and burning rate of flammable translucent materials. To improve accuracy flammability predictions by pyrolysis models, spectral dependency sources depth computational cell in sample should be considered. This paper provides spectra black Poly(methyl methacrylate) (PMMA) a wide range 0.25 to 25 μm measuring high-resolution transmissivity thin samples. Compared clear PMMA, PMMA has higher coefficient UV–Vis–NIR region (<2.3μm). We extracted complex index refraction from applying Kramers–Kronig transform (KK-transform). Furthermore, investigate effect temperature on its absorption, absorbance was measured with FTIR-ATR for up polymer’s melting temperature. The results showed that may increase material Implementing optical constants, simulated profiles layer subjected heat flux 15 28 kW/m2 are obtained, showing good agreement experimental data. Finally, set data effective as function source is proposed gray modeling simulations.