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In our former work precipitated calcium carbonate nanoparticles coated with fatty acids were added into highdensity polyethylene and the impact strength of the polymeric composites was increased as the amount of stearic acid increased We believed that the interfacial adhesion between PCC and HDPE was affected by the amount of fatty acid
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employed to confirm the stearic acid coating on the Calcium Carbonate surface The peaks at 2925 and 2885 cm‒1 are ascribed to the methylene groups of alkyl chain and the shoulder at 1615 cm‒1 corresponds to the appearance of a carboxylic group indicating that stearic acid has been attached to the surface of CaCO 3
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Dissolve the polymer and stearic acid 15 eq in 500 ml dry dichloromethane DCM Add NN''dicyclohexylcarbodiimide DCC 20 eq and 3 flakes of 4dimethylaminopyridine Stir under nitrogen at room temperature for 24 hr
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To illustrate the fact that some commercial CaCO 3 fillers are overcoated and contain an excess of surfactant the DTG traces of Omycarb 1TAV the same filler mechanically mixed with stearic acid Supercoat and Superpflex 200 are plotted in Fig can be seen 1TAV does not contain excessive stearic acid as evidenced by the absence of the peaks at ca 200 °C local bilayer and ca 270
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Chemical structures of calcium carbonate and stearic acid are shown in Figure 1 Figure 1 Chemical structures a Calcium carbonate b Stearic acid To confirm that stearic acid was successfully coated on the surface of calcium carbonate the samples were characterized by FTIR and results are shown in Figure 2 Characteristic absorption
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Keywords ground calcium carbonate stearic acid flowability floodability dispersive component of surface free energy D S inverse gas chromatography IGC 1 Introduction Ground calcium carbonate GCC is the most widely used filler in the plastics rubber paper paint and ink industry1 It is usually obtained by grinding natural
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Calcium carbonate CaCO 3 is a substance widely used for various purposes for example as a filler and pigment material not only in paper plastics rubbers paints and inks but also in pharmaceutics cosmetics construction materials and asphalts and as a nutritional supplement in animal foods 1Besides the socalled ground calcium carbonate GCC which is milled from natural limestone
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This effect may be attributed to plasticizing effect of calcium stearate CaSt whose presence is an effect of reaction between stearic acid and calcium carbonate which is a content of BMC waste Young modulus of prepared composites is similar for both material series and no significant influence of CaSt presence was observed Fig 2 b
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Optimal coating of calcite with stearic acid gave a monolayer of calcium stearate bicarbonate in which one acid molecule is attached to every Ca2 present on the surface The alkyl chains in the monolayer are vertically oriented to the surface and are restricted in their motion 13C NMR and IR spectroscopy revealed that the chain conformation shows a high trans population which leads to an
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