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Vaterite composite particles were obtained using an octacarboxy-terminated T8-caged silsesquioxane (POSS-(COOH)8). Incubation of the vaterite composite particles in distilled water for 3 days led to a complete phase transition to calcite. Calcite thin films were obtained on a glass substrate that was pre-coated with a poly(diallyldimethylammonium chloride) (PDDA) layer or a multilayer of PDDA with poly(sodium 4-styrenesulfonate) (PSS) through repeated cycles of layer-by-layer deposition of vaterite particles, followed by a phase transition to calcite. Free-standing calcite thin films were obtained through repeated cycles of this process after PDDA and PSS were coated on the surface of the calcite thin films. Poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) were also used instead of PDDA and PSS to prepare calcite thin films on a glass substrate. After the ionic complex formation of PAH with PAA, amide cross-linking between the two polymers can proceed through a heat treatment. In contrast to the case of using PDDA and PSS, the resulting calcite thin films did not detached from the glass substrate. The peel test revealed that the adhesion strength of the film to the glass substrate was stronger than that of scotch tape.

polymer journal

Fabrication of polymer-calcite composite thin films by phase transition of vaterite composite particles with octacarboxy-terminated T8-caged silsesquioxane