Bioglass® Scaffolds Reinforced by a Composite Polyvinyl Alcohol/Microfibrillated Cellulose Coating

0435421 - ÚFM 2015 RIV US eng O - Others
Bertolla, Luca - Dlouhý, Ivo - Boccaccini, A. R.
Bioglass® Scaffolds Reinforced by a Composite Polyvinyl Alcohol/Microfibrillated Cellulose Coating.
2014
EU Projects: European Commission(XE) 264526 - GLACERCO
Institutional support: RVO:68081723
Keywords : Bioglass® scaffolds * Porous materials * Polymer coating
Subject RIV: JI - Composite Materials
http://www.programmaster.org/PM/PM.nsf/ApprovedAbstracts/BF58F3A508FBEFCD85257C760035002B?OpenDocument

The present work deals with the preparation and characterization of Bioglass® porous scaffold reinforced by a composite coating constituted by polyvinyl alcohol and microfibrillated cellulose(MFC). Samples were produced by foam replication process, involving a modified ethanol-based slurry. A structure with nominally 90% of open porosity and ~ 400 µm mean pore size was achieved. The coating was obtained by dipping the samples into an aqueous solution of MFC. Compressive and tensile tests, according to a new testing methodology optimized for highly porous ceramics were carried out. The addition of the coating led to a 40 fold increase of tensile strength and a 10 fold increase of compressive strength. SEM observations on broken struts surfaces proved the reinforcing and toughening effect of the coating due to crack bridging and fracture of cellulose fibrils.
Permanent Link: http://hdl.handle.net/11104/0239308