Abstract
New types of polyurethanes were prepared by reacting diisocyanates and formiated soy polyols with different OH functionalities. Thermal properties and degradation kinetics were investigated by TGA. All prepared PU's showed at least two-weight loss steps, the first one, around 210 °C. Thermal stability of these PUs depends strongly on urethane groups per unit volume and an increase in the weight loss was observed as a result of the increased amount of urethane groups. Degradation kinetics behavior of the soy-based polyurethanes was investigated according to the Flynn method. Different average activation energy values were obtained from isothermal and isoconversional curves, 140.6 KJ/mol and 62.8 KJ/mol, respectively, indicating the complexity of the PUs degradation process.
Highlights
Different average activation energy values were obtained from isothermal and isoconversional curves, 140.6 KJ/mol and 62.8 KJ/mol, respectively, indicating the complexity of the PUs degradation process
Degradation kinetic of polymers has been studied using knowledge of the properties of these biomaterials is by thermogravimetry (TG) with experimental data being essential for successful applications
Thermal stability of polyurethanes based on soy Ca, Cb, Cc, and corresponding times, t1a, t1b, t1c.This procedure polyols will depend on the functionality of the polyol, i.e., is repeated with the second and third isothermal curves to on the number of the urethane groups per unit volume, as obtain times t2a, t2b, t2c and t3a, t3b, t3c
Summary
Different average activation energy values were obtained from isothermal and isoconversional curves, 140.6 KJ/mol and 62.8 KJ/mol, respectively, indicating the complexity of the PUs degradation process. Thermal stability of polyurethanes based on soy Ca, Cb, Cc, and corresponding times, t1a, t1b, t1c.This procedure polyols will depend on the functionality of the polyol, i.e., is repeated with the second and third isothermal curves to on the number of the urethane groups per unit volume, as obtain times t2a, t2b, t2c and t3a, t3b, t3c.
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