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Materiale Plastice
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https://doi.org/10.37358/Mat.Plast.1964

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Materiale Plastice (Mater. Plast.), Year 2007, Volume 44, Issue 3,





The Influence of Azo Groups on the Thermal Behaviour of Some Copolyethers with Different Spacers


Abstract:
The paper presents the kinetic characteristics in non-isothermal conditions obtained by degradation in argon of some aromatics copolyethers with semi rigid and flexible spacer and by comparing the results obtained for the homopolyethers corresponding to the bisphenols and spacer used. Copolyethers were synthesised by phase transfer catalysis method in liquid/liquid system. Oxetanic, diethyl etheric or hexamethilenic spacers have been used. 4,4’-dihidroxy azobenzene and 4,4’ dihidroxy biphenyl were used as bisphenol. Thermogravimetric analysis and derivative thermogravimetric analysis were applied. The kinetic characteristics suggest the complexity of the thermal degradation mechanism up to 1000°C. The degradation rate is depending on the chemical structure of the main chain. Compensation equations are proposed. Keywords: kinetic characteristics, aromatic copolyethers, thermal degradation



Issue: 2007 Volume 44, Issue 3
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