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MECHANICAL EVALUATION OF A HYBRID NITRILE RUBBER COMPOSITE MADE WITH COARSE PARTICLES OF PUMPKINS SEED HUSK, SILICA AND SILANE COUPLING AGENT

Abstract:

Acrylonitrile-butadiene rubber (NBR) composites were development with hybrid filler from silica and coarse particles of pumpkins seed husk (PSH). B is (triethoxy-silylpropyl) tetrasulfide (TESPT) was used as coupling agent. Other ingbkp_redients used: polar plasticizer, antioxidant, aid process and sulfur curing system. PSH was mercerized with dilute NaOH solution. The compounding was carried out in a laboratory size two-roll miller; the TESPT was added directly in the mixing stage. The rubber composites were vulcanized using compression molding in a laboratory press. Four NBR vulcanizates were made to evaluate the effect of mercerized PSH and silane on the mechanical properties. It was found that the incorporation of PSH affected the curing characteristics, hardness, tensile strength, elongation at break and abrasion resistance in hybrid composites. The presence of TESPT in the hybrid compound improved the tensile and elongation properties. However, the presence of large PSH particles probably limited silane's performance on other properties. PHS is a waste of seeds husk from pumpkin fruits (genus Curcubita). Fine PHS particles can be an alternative to elaborate hybrid rubber compounds since it allows achieving a good balance between mechanical properties and friendly environmental production.