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Abstract

Polysulfone (PSU) composite films filled with β-dicalcium silicate (-Ca₂SiO₄) particles are prepared by the solvent casting-evaporation method. The surface morphologies and mechanical properties of the films are determined. The bioactivity of the composite films is evaluated by soaking them in simulated body fluid (SBF) and the results show that the composites are bioactive as they induce the formation of hydroxyapatite (HAp) on the surface of the composite films. The measurement of the water contact angles suggests that the incorporation of -Ca₂SiO₄ particles into PSU matrix can improve the hydrophilicity of the composite. PSU composite films filled with modified -dicalcium silicate (-mCa₂SiO₄) particles are also prepared after -Ca₂SiO₄ particles are treated with dodecyl alcohol through surface esterification reactions. The infrared spectra of the -mCa₂SiO₄ particles before and after aging in water indicate that the surface modification is reversible. The scanning electron microscope (SEM) images (micrographs) of both composites show that the dispersion of inorganic particles in the polymer matrix improves after surface modification. The PSU- -mCa₂SiO₄ composite is still bioactive and exhibits the same water contact angle after aging in water as compared to that of the PSU- -Ca₂SiO₄ composite. All these results suggest that the incorporation of -Ca₂SiO₄ particles is a useful method to prepare composites with improved bioactivity and hydrophilicity, and the surface modification of -Ca₂SiO₄ particles can improve the dispersion while retaining the bioactivity and hydrophilicity.

Keywords

reversible dodecyl alcohol dicalcium silicate polysulfone composite film hydrophilicity

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Fabrication and Characterization of Polysulfone-Dicalcium Silicate Composite Films

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