Processing of hydrogel isotermic data on the base of polymethyl vinyl ether of maleic acid cross linked with polypropylene glycol under thermogravimetric data Comparative kinetic analysis by NPK method

Abstract

Analysis of different computational methods for kinetic parameters of hydrogel thermal degradation on the base of polymethyl vinyl ether of maleic acid cross linked with polypropylene glycol under thermogravimetric data is presented. Researches were made in a nitrogen and air atmosphere at different heating rates: 6, 10, 12 and 16 K/min. It was demonstrated that it makes sense to apply approaches of Friedman, Ozawa-Flynn-Wall, related to group of isoconversion methods. Obtained data indicate decentish coincidence between values of activation energy obtained by different methods. To get complete kinetic analysis, it is necessary to process data applying the method of non-parametric kinetics. Non-parametric kinetics method (NPK) is a special approach for processing of kinetic data. Method is a new viewpoint to kinetic analysis, which is based upon rounding of results of single-stage process kinetics. Experimental values of response time are located in the matrix, which is expressed as multiplication of two vectors, containing the information on f (T) and g(α).