Infrared Radiation Properties of Methyl Methacrylate Vapor

Effects of fuel absorption on radiative heat transfer in methanol pool fires

“…However, in general these models have difficulties predicting thermal energy feedback to the fuel surface and the associated mass burning rate for pool fires. Thus, there is motivation to improve the radiation absorption database for gas-phase fuel molecules relevant for pool fires, and several studies over the past decade have contributed to that effort [22][23][24].…”

Thermal degradation of Poly(methyl methacrylate) with a 1.064 μm Nd:YAG laser in a buoyant flow

“…6a, the spectral ringing along most of the spectrum occurs as a consequence of the infinite interferogram length, which can be attenuated by the apodization function [29]. The observed spectral features are characteristic for the emission of MMA [9]. As summarized in Table 1, we can identify in the LWIR, combination of CeH and CeOeC deformation at 811 cm À1 , out of plane bending peaks for ¼ CH at 938 and 1015 cm À1 , CeO stretching at 1159 and 1202 cm À1 , CH 3 -bending peaks at 1308 and 1446 cm À1 , a C]C stretching peak at~1632 cm À1 , a C]O stretching peak at 1737 cm À1 , and atmospheric H 2 O absorption overlapping with the C]C and C]O stretching peaks from~1330 to 1800 cm À1 .…”

“…Since PMMA predominantly depropagates to its monomer as a result of thermal degradation, it is important to monitor the infrared emission of MMA with high fidelity. The principal infrared bands of gaseous MMA have been reported previously and are summarized in Table 1 [9].…”

“…The oxidative thermal degradation of polymers usually results in complex kinetics with emission from molecular species not readily available in the current spectral databases. Park et al [9] investigated the infrared radiation properties of MMA from statistical narrow band models to fit the measured FTIR spectra. The monomer column density can also be estimated from total band emissivity calculations from Park et al [9] as well from radiative transfer models.…”

A technique for extrapolating absorption coefficient measurements to high temperatures

“…In work directed at measuring the radiative feedback to the fuel surface in 1540 PMMA pool fires, DeRis [2] concluded that ''it is critically important for fire researchers to develop accurate and convenient ways to measure absorption-emission coefficients for fuels.'' This has motivated several recent studies on fuel absorption at elevated temperatures [3][4][5][6][7]. The focus of this investigation was to develop a semi-quantitative method to extrapolate absorption coefficients, obtained for temperatures up to 700 K, to the higher temperatures (1000 K) that are required to describe the transfer of radiation between the flame zone and fuel-rich core.…”