Corn cob Powder (CCP) Filled Natural Rubber (NR) Composites with Si69 as Coupling Agent: Effect of Si69 Content on Properties of the Composites

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Supalak Attharangsan
Sunan Saikrasun


In this study, bis-(3-triethoxysilylpropyl) tetrasulphane (or Si69) was used as coupling agent for corn cob powder (CCP) filled natural rubber (NR) composites and also varied from 0 to 5 phr, i.e. 0, 1, 1.5, 2, 3 and 5 phr. The effect of Si69 content on curing characteristics, tensile properties, fatigue life, morphology and rubber-filler interaction of the CCP filled NR composites was investigated. The results show that maximum torque, tensile strength, moduli at 100% and 300% extension, elongation at break, fatigue life and rubber-filler interaction increase with the increase in Si69 content up to 2 phr. Beyond that, the overall properties decrease. However, there is no significant effect of Si69 content on  scorch time and cure time.  The SEM studies also reveal greater adhesion between CCP particles and rubber matrix due to incorporation of Si69. Finally, it can be concluded that Si69 at 2 phr is the optimum loading which provides the best overall properties of CCP filled NR composites.


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