Assessment of efficacy of trivalent lanthanum complex as surface modifier of calcium carbonate

Abstract

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 .

Synergies among the self-assembled β-nucleating agent and the sheared isotactic polypropylene matrix

“…LIG1 and LIG2 are dicarboxylic acid and amide-type ligands with coordination numbers of m and n, respectively [10]. Its synthetic method is described in the literature [34]. The diameter and length of a single raw b-NA crystal were tens of nanometers and less than 1 mm, respectively.…”

Effects of nano calcium carbonate modified by a lanthanum compound on the properties of polypropylene

“…Feng et al 17 used a complex of trivalent lanthanum stearate with stearin as a surface modifier to treat nCaCO 3 by mechanical mixing, and its efficacy was assessed. They found that the surface properties of nCaCO 3 could be changed.…”

Preparation and colloidal behaviour of surface-modified EuF3

“…Possibility of grafted organic layer modification is shown [1]. CaCO 3 as a modification substance is studied in [3][4][5]. CaCO 3 modification with sodium stearate and oleic acid, resulting in greater hydrophobicity, greater stability in nonpolar media and enhanced compatibility with nonpolar matrices, was used to obtain nanocomposites of poly(methylmethacrylate)-CaCO 3 [4].…”

“…In [1,2] chemical modification of Ln 3+ -doped LaF 3 and LaPO 4 nanoparticles by organic and organophosphorous acids, 2-aminoethyl phosphate and its derivative is investigated. Authors showed that ligands bond covalently with the ionic crystal surface, caused a solubility of ionic particles in polar aprotic solvents.…”