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

Reference:

Price, G. J. and Ansari, D. M., 2004. Surface modification of calcium carbonates studied by inverse gas chromatography and the effect on mechanical properties of filled polypropylene. Polymer International, 53 (4), pp. 430-438.

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Official URL:

http://dx.doi.org/10.1002/pi.1392

Abstract

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.

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