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Assessment of efficacy of trivalent lanthanum complex as surface modifier of calcium carbonate
Author(s) -
Feng Jiachun,
Chen Mingcai,
Huang Zhitang
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1969
Subject(s) - materials science , polypropylene , calcium carbonate , composite material , dispersion (optics) , filler (materials) , lanthanum , chemical engineering , chemistry , organic chemistry , engineering , physics , optics
A complex of trivalent lanthanum stearate with stearin (REC) was used as a surface modifier to treat calcium carbonate, and its efficacy was assessed. The measurement of the viscosity of a CaCO 3 /liquid paraffin suspension demonstrated that REC treatment could considerably improve the dispersion of filler in nonpolar media. The FTIR spectrum analysis revealed that the REC bonded to the CaCO 3 surface not only by physical absorption but also by a chemical reaction. The REC could change the surface properties of CaCO 3 , resulting in greater hydrophobicity of the surface and enhanced compatibility with nonpolar matrices. The mechanical properties and melt flow rate (MFR) examination of polypropylene (PP)/CaCO 3 composites showed that REC treatment remarkably enhanced the toughness and MFR of composites at higher filler loading. The fractured surface observation with SEM showed improved filler dispersion and enhanced interfacial adhesion between the filler and matrix in PP composites filled with REC‐treated CaCO 3 . All these improvements demonstrated that REC is an effective surface modifier of CaCO 3 . © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 1339–1345, 2001