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Surface Modification of Tricalcium Phosphate for Improvement of the Interfacial Compatibility with Biodegradable Polymers by Carmen Kunze; Thomas Freier; Ekaterina Helwig; Barbara Sandner; Dieter Reif; André Wutzler; Hans-Joachim Radusch is a Engineering article available to read on EtoBox.

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The surface of tricalcium phosphate (TCP) filler particles was activated by treatment with dilute aqueous phosphoric acid. ATR-IR spectra indicated the formation of calcium hydrogen phosphate dihydrate at the surface. Oligo(lactone)s were formed by the subsequent reaction of the activated TCP with L-lactide and epsilon -caprolactone, respectively, at 150 degrees C without any additional catalysts. After extraction of the oligo(lactide), the residue of modified TCP-included calcium lactate whereas the water of crystallization of the dihydrate disappeared as shown by ATR-IR spectroscopy. Owing to the insolubility of TCP in common solvents, the analogous reaction between water-soluble disodium hydrogen phosphate dihydrate and L-lactide was used to study the kind of chemical bonds by high-resolution NMR spectroscopy. The 1H and 13C NMR spectra of the reaction product also pointed out the presence of calcium lactate. Additionally, signals were found indicating a covalent attachment of lactic acid units onto the phosphorus. For the preparation of composites, poly(L,DL-lactide) was mixed with TCP and modified TCP, respectively, in a ratio of 75/25 (w/w) and directly injection moulded into

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Author

Carmen Kunze; Thomas Freier; Ekaterina Helwig; Barbara Sandner; Dieter Reif; André Wutzler; Hans-Joachim Radusch

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0142-9612)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)