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《Bulletin of the Chinese Ceramic Society》 2006-05
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Surface Modification of Porous Polyurethane Scaffold by “Self-setting” of Calcium Phosphate Bone Cement

ZHOU Cai-lou1, CAI Shu2, XIAO Zhang-ying2, ZHAO Dan1, WANG Yan-wei2 (1.School of Materials, Tianjin Institute of Urban Construction, Tianjin 300384; 2.Key Laboratory for Advance Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072)  
In order to improve the bioactivity of porous polymer scaffold, porous biocomposite was prepared by modifying porous polyurethane template using a coating method according to the “self-setting” characteristic of α-tricalcium phosphate (α-TCP) bone cement in a moist environment. The coating of hydroxyapatite (HAp) was performed by dipping porous polyurethane template into α-TCP bone cement slurries and hydration for some days. The experimental results show that 2.5wt% ammonium polyacrylate (PAA-NH_4) addition in the slurry would inhibit the growth of hydroxyapatite grains by absorbing NH+_4 groups onto the active sites of the HAp crystal surface. The modified layer was composed of hydroxyapatite nano-fiber growth in situ with a diameter about 10-30nm. The porous bodies by this technique were found to have tractable and interconnected porosity as the original template, with typical pore sizes ranging from 150-500μm. This new processing technique can be used to improve the bioactivity of porous polymer template while maintaining its macroprous structure.
【Fund】: 天津市自然基金项目(yfjmjc02900).
【CateGory Index】: R318.08
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