Composite coatings based on linear and branched block copolymers for hydroxyapatite deposition in simulated body-fluid

QUIROGA, GISELA ALEJANDRA RAMONA; NINAGO, MARIO DANIEL; REDONDO, FRANCO LEONARDO; VILLAR, MARCELO ARMANDO; DE FREITAS, AUGUSTO GONZAGA OLIVEIRA; CIOLINO, ANDRÉS EDUARDO

Polymer-Plastics Technology and Materials

Taylor & Francis Group

Año: 2020 vol. 59 p. 985 - 997

2574-0881

In this work, the fabrication of composite coatings based on block copolymers and silicatesdeposited on stainless-steel plates through electrophoretic deposition technique was studied.Linear poly(ɛ-caprolactone), and poly(dimethylsiloxane-block-ε-caprolactone) copolymers wereobtained through ROP polymerization, whereas branched poly(hydroxyethyl methacrylate-co-(hydroxyethylmethacrylate-graft-ε-caprolactone)-block-ε-caprolactone) copolymers were synthesized by a one-pot technique by combining ROP and RAFT synthesis. SEM micrographs revealedhomogenous and dense structures over the metallic substrate and the absence of micro-cracks.Thermal characterization revealed residual percentages of solids between 63% and 72% wt/wt.Finally, an in-vitro assessment confirmed the presence of a hydroxyapatite layer over coatingsafter immersion in a simulated body-fluid solution by XRD analyses