Production of CaCO₃/hyperbranched polyglycidol hybrid films using spray-coating technique

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• 作者：Kalina Malinova^a ; Manfred Gunesch^b ; Sabrina Montero Pancera^c ; Robert Wengeler^d ; Bernhard Rieger^b ; Dirk Volkmer^a ; ^{dirk.volkmer@physik.uni-augsburg.de}
• 关键词：SAM ; self-assembled monolayer ; ACC ; amorphous calcium carbonate ; LBL ; layer-by-layer ; LFS ; liquid-feed solution ; Mn ; number average molecular weight ; hb-PG ; hyperbranched polyglycidol ; hb ; hyperbranched ; COO-terminated hb-PG ; hyperbranched polyglycidol ca
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：15 May, 2012
• 卷：374
• 期：1
• 页码：61-69
• 文件大小：1134 K

摘要

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 CaCO₃/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 CaCO₃ particle density and morphology in the final coatings. We employ reactive spray-coating techniques to generate CaCO₃/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.