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Nucleation and growth mechanism of apatite on a bioactive and degradable ceramic/polymer composite with a thick polymer layer

Title
Nucleation and growth mechanism of apatite on a bioactive and degradable ceramic/polymer composite with a thick polymer layer
Authors
Lee J.-C.Cho S.B.Lee S.J.Rhee S.-H.
Ewha Authors
이승진
SCOPUS Author ID
이승진scopus
Issue Date
2009
Journal Title
Journal of Materials Science
ISSN
0022-2461JCR Link
Citation
vol. 44, no. 17, pp. 4531 - 4538
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Nucleation and growth mechanism of apatite on a bioactive and degradable PLLA/SiO2-CaO composite with a thick PLLA surface layer were investigated compared to that on a bioactive but non-degradable polyurethane (PU)/SiO2-CaO composite with a thick PU surface layer. The bioactive SiO2-CaO particles were made by a sol-gel method from tetraethyl orthosilicate and calcium nitrate tetrahydrate under acidic condition followed by heat treatment at 600°C for 2 h. The PLLA/SiO2-CaO and PU/SiO2-CaO composites were then prepared by a solvent casting method which resulted in thick PLLA and PU surface layers, respectively, due to precipitation of SiO2-CaO particles during the casting process. Two composites were exposed to SBF for 1 week and this exposure led to form uniform and complete apatite coating layer on the PLLA/SiO2-CaO composite but not on the PU/SiO2-CaO composite. These results were interpreted in terms of the degradability of the polymers. A practical implication of the results is that a post-surface grinding or cutting processes to expose bioactive ceramics to the surface of a composite with a thick biodegradable polymer layer is not required for providing apatite forming ability, which has been considered as one of the pragmatic obstacles for the application as a bone grafting material. © 2009 Springer Science+Business Media, LLC.
DOI
10.1007/s10853-009-3685-3
Appears in Collections:
약학대학 > 약학과 > Journal papers
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