Nanotemplating of Calcium Phosphate Using a Double-Hydrophilic Block Copolymer
| Autor: | Jia Yao, Kam C. Tarn, Wiliana Tjandra, Airin Alamsjah, Palaniswamy Ravi |
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| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
Materials science Ethylene oxide Atom-transfer radical-polymerization General Chemical Engineering Inorganic chemistry chemistry.chemical_element General Chemistry Polymer Calcium Ion selective electrode chemistry.chemical_compound chemistry Methacrylic acid Chemical engineering Materials Chemistry Copolymer Hybrid material |
| Zdroj: | Chemistry of Materials. 17:4865-4872 |
| ISSN: | 1520-5002 0897-4756 |
| Popis: | Atom transfer radical polymerization technique was used to synthesize poly(ethylene oxide)-block-poly(methacrylic acid) (PEO-b-PMAA) copolymer, which was employed as a template for the controlled precipitation of calcium phosphate from aqueous solution at different pH values. The interactions between polymer and inorganic ions were studied using Ca 2 + ion selective electrode, which indicated a possible weak interaction between Ca 2 + and PEO segments, in addition to the interaction between Ca 2 + and MAA segments. Two interesting superstructures consisting of an organized inorganic/organic hybrid material were characterized by electron microscopy. At pH ∼4.0 a nested structure consisting of hybrid nanofilaments was obtained. The fibers originate from a core of a size similar to that of the primary polymer aggregates, suggesting that cooperative interactions at a local level between dissolving calcium phosphate clusters and disassembling polymer segments may be responsible for the highly anisotropic character of the secondary growth process. At pH ∼9.0 fractal growth morphology was obtained through the mineralization process. Such calcium phosphate/polymer nanohybrids with complex morphologies are interesting and might also be useful as novel ceramic precursors, reinforcing fillers, or biomedical implants. |
| Databáze: | OpenAIRE |
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