Mechanical reinforcement of Bioglass (R)-based scaffolds by novel polyvinyl-alcohol/microfibrillated cellulose composite coating

0435151 - ÚFM 2015 RIV NL eng J - Journal Article
Bertolla, Luca - Dlouhý, Ivo - Philippart, A. - Boccaccini, A. R.
Mechanical reinforcement of Bioglass (R)-based scaffolds by novel polyvinyl-alcohol/microfibrillated cellulose composite coating.
Materials Letters. Roč. 118, MAR (2014), s. 204-207. ISSN 0167-577X. E-ISSN 1873-4979
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0068
EU Projects: European Commission(XE) 264526 - GLACERCO
Institutional support: RVO:68081723
Keywords : bioactive glass * mechanical properties * scaffolds * cellulose * coatings
Subject RIV: JL - Materials Fatigue, Friction Mechanics
Impact factor: 2.489, year: 2014

The preparation and mechanical properties of Bioglass®-based porous scaffolds reinforced by a composite coating constituted by polyvinyl alcohol (PVA) and microfibrillated cellulose (MFC) are investigated. Samples produced by foam replication process and having nominally 90% of open porosity were coated by dipping into an aqueous solution of PVA and MFC. Tensile tests were conducted on samples according to a new testing methodology optimized for highly porous ceramics. The addition of PVA/MFC coating led to a 10 fold increase of the tensile strength of scaffolds. The reinforcing and toughening effect of the composite coating due to crack bridging and fracture of cellulose fibrils embedded in the PVA matrix was proved by SEM observations.
Permanent Link: http://hdl.handle.net/11104/0239057