Rapid Determination of Kinetic Parameters for the Thermal Degradation of High Polymers Utilizing a Computerized Thermogravimetric Analyzer-Mass Spectrometer System,

摘要

A thermogravimetric analyzer and a mass spectrometer are operated in a tandem mode for mass spectrometric thermal analysis (MTA) of high polymers. During the course of an analysis,the weight loss of the sample under investigation is recorded with respect to increasing sample temperature by the thermogravimetric analyzer. Simultaneously,the evolved gaseous thermal decomposition products are introduced into the mass spectrometer which records mass spectra repetitively at scan speeds of the operator's choice. The mass spectrometer is coupled to a computer for continuous on-line data acquisition. The rate of evolution for identified components as measured by the mass spectrometer and the total weight of volatilized products are used in the kinetic analysis of degradation reactions. A computer program has been developed for rapid calculations of order of reaction n and activation energy E. (Modified author abstract)