title: Production of CaCO3/hyperbranched polyglycidol hybrid films using spray-coating technique.
abstract: Biomineralizing organisms employ macromolecules and cellular processing strategies in order to produce highly complex composite materials such as nacre. Bionic approaches translating this knowledge into viable technical production schemes for a large-scale production of biomimetic hybrid materials have met with limited success so far. Investigations presented here thus focus on the production of CaCO(3)/polymer hybrid coatings that can be applied to huge surface areas via reactive spray-coating. Technical requirements for simplicity and cost efficiency include a straightforward one-pot synthesis of low molecular weight hyperbranched polyglycidols (polyethers of 2,3-epoxy-1-propanol) as a simple mimic of biological macromolecules. Polymers functionalized with phosphate monoester, sulfate or carboxylate groups provide a means of controlling CaCO(3) particle density and morphology in the final coatings. We employ reactive spray-coating techniques to generate CaCO(3)/hybrid coatings among which vaterite composites can be prepared in the presence of sulfate-containing hyperbranched polyglycidol. These coatings show high stability and remained unchanged for periods longer than 9 months. By employing carboxylate-based hyperbranched polyglycidol, it is possible to deposit vaterite-calcite composites, whereas phosphate-ester-based hyperbranched polyglycidol leads to calcite composites. Nanoindentation was used to study mechanical properties, showing that coatings thus obtained are slightly harder than pure calcite.
authors.affiliation: Augsburg University, Chair of Solid State and Materials Chemistry, Institute of Physics, Universitaetsstrasse 1, D-86159 Augsburg, Germany.
authors.forename: Kalina
authors.initials: K
authors.lastname: Malinova
authors.forename: Manfred
authors.initials: M
authors.lastname: Gunesch
authors.forename: Sabrina
authors.initials: S
authors.lastname: Montero Pancera
authors.forename: Robert
authors.initials: R
authors.lastname: Wengeler
authors.forename: Bernhard
authors.initials: B
authors.lastname: Rieger
authors.forename: Dirk
authors.initials: D
authors.lastname: Volkmer
mesh_terms: D000433:1-Propanol / Q000737:chemistry*; D040761:Biomimetic Materials / Q000737:chemistry*; D002119:Calcium Carbonate / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D004852:Epoxy Compounds / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D008970:Molecular Weight; D010710:Phosphates / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: D020099:Coated Materials, Biocompatible; D004852:Epoxy Compounds; D010710:Phosphates; D011108:Polymers; D013431:Sulfates; D000433:1-Propanol; D002119:Calcium Carbonate