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Deposition of Carbonated Hydroxyapatite (CO 3 HAp) on Poly(Methylmethacrylate) Surfaces by Decomposition of Calcium–EDTA Chelate
Author(s) -
Yusufoglu Yusuf,
Akinc Mufit
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02540.x
Subject(s) - apatite , crystallite , materials science , fourier transform infrared spectroscopy , scanning electron microscope , nuclear chemistry , mineralogy , chemical engineering , chemistry , composite material , metallurgy , engineering
Inspired from the nature, the development of organic–inorganic composites between polymers and hydroxyapatite (HAp) has been investigated extensively. In this study, bone‐like apatite (carbonated hydroxyapatite, CO 3 HAp) was precipitated on poly(methylmethacrylate) (PMMA) films by the oxidative decomposition of Ca–EDTA (calcium–ethylenediamine tetraacetate) chelates. Corona‐treated PMMA films were soaked in a Ca–EDTA–PO 4 –H 2 O 2 solution and aged at 63°C and pH∼9 for times ranging from 1 to 24 h. Apatite formed on PMMA films was characterized by X‐ray diffraction, Fourier transform infrared (FTIR), Scanning electron microscope, energy‐dipersive X‐ray spectroscopy, and carbon analysis. The apatite was found to be CO 3 HAp with Ca/P atomic ratio ranging between 1.3 and 1.9. Elemental analyses indicated that the carbonate content of the apatite phase was around 6.5 wt% after 24 h of aging time. Lattice parameters were estimated using a Rietveld profile‐analysis and found to be a =0.9438 nm and c =0.6901 nm. Furthermore, FTIR spectra indicated that the apatite deposited on PMMA was B‐type CO 3 HAp, in which carbonate ions occupy the phosphate sites. In the first 3 h of aging, isolated rod‐like HAp particles were observed. With time, the needle‐like crystallites radiate from a nucleus to form double‐spherulite shape particles. The crystallites grew into a continuous layer with a thickness of ∼15 μm after 24‐h aging. The adhesive strength between the PMMA substrate and the apatite layer was determined to be around 1.7 MPa.