Characteristic Studies on Novel Biodegradable Polyurethane Thin Films from Soyabean oil

Abstract

Polyurethane thin film was synthesised from soyabean oil, ethylene glycol, 30% hydrogen peroxide and isophorone diisocyanate by stepwise polymerisation technique. The biodegradability of the polyurethane film was studied by soil burial test .The chemical resistance of the polyurethane was analysed with different solvents. The polyurethane thin film was characterised with respect to their mechanical properties such as hardness, tensile strength, percentage elongation and young’s modulus. These studies revealed that the rigid polyurethane possess good tensile strength and biodegradability. The exothermic and endothermic nature of the polymer showed that the polyurethane was thermally stable. The physical properties such as acid value, saponification value, epoxy value, viscosity and hydroxyl values calculated. The FTIR and NMR spectral studies carried out to identify the nature of the polymer formed. Sem analysis confirmed that the polymer was biodegradable in nature. The shore hardness of the thin film was measured with the help of durometer. The tensile strength increases with increase in concentration. The young’s modulus of the thin film was calculated from the tensile strength analysis. The elasticity of the thin film was also measured by using tensile strength measurement. The swelling parameters were studied with polar and organic solvents. The thermal degradation at different time intervals were analysed by TG-DTA analysis.