In this study,agricultural proteins were compounded into synthetic isoprene rubber (IR) and sulfur-cured.A constant filler loading of 8 parts per hundred rubber (phr) was used to evaluate the reinforcing capabilities of two full proteins,i.e.,corn zein (Zein) and gliadin from wheat (Gd),a hydrolyzed protein,i.e.,trypsin hydrolyzed gliadin (THGd),and a neat amino acid,i.e.,arginine (Arg).Cure meter testing,tensile testing,and swelling experiments were performed to assess the curing kinetics,Young's moduli (E),hysteresis,and crosslink densities of the vulcanizates.The filled vulcanizates exhibited comparable or higher E and [X] than an unfilled IR Control,but slower curing kinetics.The hysteresis,or unrecoverable mechanical energy,decreased with increasing elongation in the filled vulcanizates,which was opposite the behavior of the IR Control.
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