Thermal
properties of polyurethanes synthesized using waste polyurethane foam glycolysates |
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Authors: | J Datta M Rohn |
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Institution: | (1) Chemical Faculty, Department of Polymer Technology, Gdańsk University of Technology, Gdańsk, Poland, 80-952 |
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Abstract: | In this work thermal
transitions and thermal stability of polyurethane intermediates and polyurethanes
were investigated. The intermediates were obtained by glycolysis of waste
polyurethane (PUR) in the reaction with hexamethylene glycol (HDO). The excess
of HDO was not separated from the product after the glycolysis process was
finished. The effects of different mass ratio of HDO to PUR foam on selected
physicochemical properties (hydroxyl number, Brookfield viscosity and density)
were also determined.
The polyurethanes were synthesized from
the obtained intermediates by the prepolymer method using diisocyanate (MDI)
and glycolysis product of molecular mass in range 700/1000 g mol–1.
Hexamethylene glycol, 1,4-butanediol and ethylene glycol were used as chain
extender agents. Influence of NCO groups concentration in prepolymer on glass
transition temperature (T
g)
and storage and loss modulus (E’, E’’) of polyurethanes were investigated
by the DMTA method. Thermal decomposition of obtained glycolysates and polyurethanes
was followed by thermogravimetry coupled with Fourier transform infrared spectroscopy.
Main products of thermal decomposition were identified. |
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Keywords: | DMTA elastomer glycolysis polyurethane TG TG-FTIR thermal analysis thermal stability waste foam |
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