Preparation and characterization of hydrophilic polyurethane composite

In this study,nano-hydroxyapatite(HA) slurry and aliphatic polyurethane(PU) were selected to fabricate hydroxyapatite/polyurethane(HA/PU) nano-composites by solvent casting and evaporation methods.The morphology and properties of the nano-composites were characterized by SEM,water absorption test and mechanical testing.The results show that HA crystals with nano size are distributed uniformly in the PU matrix,but the high loading levels of nano-HA are prone to agglomerate and make against homogeneous dispersion.The addition of hydrophilic poly(ethylene glycol) in raw materials enhances the surface and bulk hydrophilicities of PU;the tensile strength and modulus of the nano-composites increase with the augment of hard segment content,while the broken elongation decreases;increasing the content of poly(ethylene glycol) in soft segment,tensile strength and broken elongation first increase and then decrease,while the tensile modulus decreases all the time;the tensile strength and broken elongation of the nano-composites are all reinforced with the addition of HA nano-particles.When incorporated of 30wt% HA nano-particles into PU matrix,the comprehensive performance of the composite reaches optimality.