Surface modification of CaCO filler and its characterization using inverse gas chromatography (IGC)

Abstract

A CaCO₃ filler was treated by generally used coupling agents and a special one - ethylene-octene copolymer (POE)-g-maleic anhydride (MAH). Fourier transform infrared spectroscopy (FTIR) results show that the special coupling agent POE-g-MAH, in a chemical reaction with CaCO_3, can produce an interfacial layer stronger than simple physical adhesion attained with usual coupling agents. Inverse gas chromatography (IGC) was used to investigate the surface free energy of CaCO₃ after surface modification and to optimize the monolayer content of coupling agents. Based on the IGC results, it can be deduced that the monolayer cover is around 1.9% for CaCO₃ treated with a titanate coupling agent. Scanning electron microscope (SEM) observation results show that the separated morphology existed in the ternary composites containing CaCO₃ after surface treatment with coupling agents, whereas the core-shell morphology was obtained in the ternary composites with POE-g-MAH. The encapsulation of the CaCO₃ filler treated with POE-g-MAH was caused by the strong chemical reaction between the elastomer and CaCO₃ particles.

References

1. Kurauchi T Ohta T Energy absorption in blendsof polycarbonate with ABS and SANJ MatSci 1984 1916991709
2. Zuiderduin W C J Westzaan C Huétink J Gaymans R J Tougheningof polypropylene with calcium carbonate particlesPolymer 2003 44261275
3. Papirer E Schultz J Tirchi C Surface properties of a calcium carbonate filler treatedwith stearic acidEuropean Polymer Journal 1984 201551158
4. Miao S Polymersurface modification and characterization of particulate calcium carbonatefillesApplied Surface Scinece 2003 220359366
5. Doris G M Gray D GAdsorption of n-alkanesat zero surface coverage on cellulose paper and wood fibers [J]. J Colloid Interface Sci 1980 77(2)353362
6. Prempher K Horanont P Phase structure of ternarypolypropylene/elastomer/filler composites: effect of elastomer polarityPolymer 2000 4192839290
7. Zhang L Wang Z H Li L B Zhang X Y PP/elastomer/calciumcarbonate composites effect of elastomer and calcium carbonate contentson the deformation and impact behaviorJounaralof Materials Science 2002 3726152621
8. Lu Sinien. Zhang Rui. A finite-element analysis oftoughening and reinforcing effects on particle-filled materialsActa Mechanica Sinica 1995 27(5)619623(in Chinese)