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252 F I R E R E S E A R C H Comparison of the results of isothermal pyrolysis of cotton with those of a- cellulose suggests that there might be differences m the kinetics of decomposition of the two materials The differences will have to be resolved by additional experi- mentation, namely, comparison of the rate of monomer loss and the rate of change in the degree of polymerization of the two materials using at least three different temperatures higher than 27&'C MacArthur, D. A. and Packham, D. R. (CSIRO Division of AppUed Chemistry, Melbourne, Austraha) "Radiation from an Ethylene Diffusion Flame," Com- bustion Science and Technology 2, 299 (1971) Sections: H, G Subjects: Ethylene-au: flames, Flames and radiation. Radiation from flames, Diffusion flames Authors' Abstract Radiation from a small ethylene flame burning in air has been measured at pressures between 40 and 95 cm of mercury The radiation between 0 4 nm and 5 5 /tm was shown to be dependent on the pressure At 40 cm Hg the radiation was 65% of that at 76 cm Hg, and at 90 cm Hg I t was 120% Radiation between 0 4 /im and 3 0 /xm was more strongly de- pendent upon pressure, and at 40 cm Hg was 50% of that at 76 cm, and it was 140% at 90 cm An approximate calculation indicates that 45% of the total radiation at atmo- spheric pressure arises from carbon particles, the remainder coming from gaseous radiation Roberts, A. F . (Department of Trade and Industry, Safety in Mines Research Establishment, Sheflield, England) "The Heat of Reaction during the Pyrolysis of Wood," Combustum and Flame 17, 79 (1971) Section: H Subjects: Pyrolysis, Wood; Heat of reaction Author's Abstract Pubhshed estimates of the overall heat of reaction durmg the pyrolysis of wood range from 2=370 J/g (endothermic) to 5 = â 1700 J/g (exothermic) Data from
