Accession Number : AD0676351

Title :   ISOTHERMAL PYROLYSIS OF CELLULOSE. KINETICS AND GAS CHROMATOGRAPHIC/MASS SPECTROMETRIC ANALYSIS OF THE DEGRADATION PRODUCTS,

Corporate Author : NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Personal Author(s) : Lipska,Anne E. ; Wodley,Frank A.

Report Date : 22 MAR 1968

Pagination or Media Count : 44

Abstract : The objective of the work was to study the degradation processes of untreated and fire retardant treated cellulose above 300C. The basic overall decomposition mechanism, in terms of three phases of pyrolysis based on weight loss measurements of the untreated cellulose between 315C - 360C, is similar to that observed between 276C - 298C. This observation was supported by measurements on the rates of formation of degradation products directly generated in the time-of-flight mass spectrometer at 298C. A 2% KHCO3 treatment of the white alpha cellulose at 300C increased the rate of volatilization 7-fold. The results of a gas chromatographic-mass spectrometric analysis of the volatile degradation products of the untreated and fire retardant treated cellulose indicated that: There is little difference in either the quality or relative quantity of volatiles generated during the three different stages of pyrolysis; the fire retardant, KHCO3, does not markedly change the types of degradation products having molecular weights below about 110, although it does change their relative concentrations; the initial rapid weight loss in both cases is not due to desorption of water, but primarily to decomposition of the cellulose molecules.

Descriptors :   (*CELLULOSE, PYROLYSIS), (*HOUSING(DWELLINGS), FIRE SAFETY), FIRE RESISTANT MATERIALS, ADDITIVES, POTASSIUM COMPOUNDS, BICARBONATES, GAS CHROMATOGRAPHY, MASS SPECTROSCOPY, REACTION KINETICS

Subject Categories : Safety Engineering
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE