Abstract
Natural rubber (NR) based composites with various amount of kaolinite were performed via the latex compounding method. The aim of this work was to investigate the effect of clay modification and clay contents on tensile properties of the NR composites. The kaolinite clay was modified by an ion exchange reaction with octadecylammonium ion. FTIR spectrum of modified kaolinite revealed the evidence of octadecylamine signals. The modified kaolinite investigated using SEM represents the platelet shape and the size distribution of organoclay particles is consistency. The tensile moduli and strengths of unmodified clay composites tend to decrease whereas those of modified clay composites are improved and increased with the modified kaolinite contents. Swelling resistance in non-polar solvent of the NR/ODA-kaolinite composites is greater than that of NR and NR/kaolinite composites. The morphological study by the SEM suggested that the modification of kaolinite clay helped improve the dispersion of clay in rubber phase. These results reflected that the dispersion of silicate layers was the key parameters in enhancing the physical properties of the composites.
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