Abstract
Semi-interpenetrating polymer networks (semi-IPNs) of polyether-based polyurethane (PU)/cross-linked poly (acrylic acid) (PAA) were synthesized with different PAA content. The PAA was cross-linked by a novel acrylic-urethane diene monomer synthesized by the condensation reaction of hexamethylene diisocyanate (HDI) and acrylic acid (AA). The resulting PU-PAA semi-IPNs were characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and tensile measurements. The presence of urethane groups in the cross-linking agent led to better interactions between PAA and PU. Elongation at break of the semi-IPNs increased by increasing the PAA content, while there is a decrease in tensile modulus and strength. PU-PAA-5 had the highest tensile strain, of 1240%. The hydrophobicity of the prepared specimens was investigated by the contact angle drop test and water absorption. The results showed that the hydrophilicity was increased by increasing the PAA content in the semi-IPNs. For PU-PAA-0 to PU-PAA-35, the water contact angle decreased from 82 to 57°. Also confirmed by Methylthiazol tetrazolium (MTT) assay and cell staining, the hydrophilicity directly affected the biocompatibility of the semi-IPNs. These results showed that the PU-PAA semi-IPNs could be a suitable biocompatible material for diverse medical applications.
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