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The PLGA/SiO2-CaO composite, which have a gradient pore structure, was newly prepared by the expansion of carbon dioxide gas in the PLGA matrix. The bioactive SiO2-CaO particles were made by a solgel method from tetraethyl orthosilicate and calcium nitrate tetrahydrate under acidic condition followed by the heat treatment at 600C for 2 h. The PLGA/SiO2-CaO composite was then prepared by a solvent casting using chloroform as solvent. The composite was loaded into the high pressure chamber and then carbon dioxide gas was introduced achieving a final pressure of 10 MPa. After 3 days, the gas was released quickly and the gradient pore structure was developed. The samples were observed by FE-SEM and its bioactivity was tested in simulated body fluid.

Preparation of a PLGA/Calcium Silicate Composite with Gradient Pore Structure