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Surface modification of calcium carbonates studied by inverse gas chromatography and the effect on mechanical properties of filled polypropylene

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Inverse gas chromatography (IGC) has been used to characterize the surfaces of a pure calcitic calcium carbonate as well as samples that had been treated with sodium polyacrylate and/or stearic acid. The dispersive components of the surface free energy for the pure material agreed well with related literature data. Polar contributions to the surface interactions with a range of probes were determined. The results show that the surface treatments reduced the polarities of the surfaces and that modification with stearic acid produced a non‐polar, low‐energy surface. Some mechanical properties of the polypropylene composites containing the modified calcium carbonates were found to correlate well with the filler surface energies. Copyright © 2004 Society of Chemical Industry
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Keywords: calcium carbonates; filled polypropylenes; inverse gas chromatography; surface energy; surface modification

Document Type: Research Article

Affiliations: 1: Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK 2: Imerys Minerals Ltd, John Keay House, St Austell, PL25 4DJ, UK

Publication date: April 1, 2004

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