Abstract
The surface modification effects of triethoxysilane (AS), methacriloxy propyl trimethoxy silane (MS), and maleic anhydride grafted polypropylene (MAPP) on the cellulose (CE), sawdust (SD) and wheat straw (WS) have been studied by tensile test at room temperature and fracture morphology observation on composites reinforced by these natural fibers. The results revealed that MAPP was the most effective coupling agent, and SD composites exhibit the best performance compared to CE and WS composites. Optimum conditions for coupling agents were found to be 1 wt % for silane coupling agents and 5 wt % for MAPP. SEM analysis confirmed tensile test results, proving better adhesion with the employment of MAPP. Void and crack formations around the fibers were observed to decrease with MAPP treatment. Silane treatment did not provide an observable enhancement in adhesion between fiber and matrix.
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