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Amorphous Calcium Carbonate in Form of Spherical Nanosized Particles and Its Application as Fillers for Polymers by K. Gorna; M. Hund; M. Vučak; F. Gröhn; G. Wegner is a Engineering article available to read on EtoBox.

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The synthesis of amorphous calcium carbonate (ACC) via a liquid precursor to give spherical particles with monodisperse distribution of diameters in the range of 0.4-1.2 m has been optimized to the level to obtain multigram yields per batch. The synthesis was achieved by precipitation of ACC from a strongly alkaline solution of calcium chloride (CaCl 2 ) at ambient temperature using the hydrolysis of water soluble dimethyl carbonate (DMC) as the internal source of CO 2 . As ACC produced by this novel method contains a small fraction of bound water a drying process, namely annealing at 200 • C for 6 h was developed. The water free powder was blended with conventional polyolefins (linear low density polyethylene (LLDPE), high density polyethylene (HDPE), polypropylene (PP), polystyrene (PS)) in a melt extrusion process. Blending with poly(lactic acid) (PLA) as a model of a biomedically relevant polymer was also achieved. While a homogenous dispersion of the dried amorphous calcium carbonate (DACC) particles in the polymer composites was easily achieved, the interaction between the polymer continuous phase and particle surface seems to be rather weak. Consequently, the physical proper

Who reads Amorphous Calcium Carbonate in Form of Spherical Nanosized Particles and Its Application as Fillers for Polymers?

Author

K. Gorna; M. Hund; M. Vučak; F. Gröhn; G. Wegner

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-5093)

Published

2008

Language

EN

Field

Engineering (Physical Sciences)