INFLUENCE OF SURFACE MODIFICATION AND FIBER LOADING ON THE PROPERTIES OF RICE STRAW-REINFORCED EPOXY COMPOSITES
Keywords:
Fiber-reinforced composite, Rice straw fiber, Epoxy resin, Surface modificationAbstract
Fiber-reinforced composites have found extensive applications in construction, automotive, aerospace, and many fields. As a result of global sustainable development and environmental concern, however, natural fibers have become increasingly attractive over synthetic fibers due to their light weight, low cost, abundance, and biodegradability. This study has been carried out to evaluate the potential use of rice straw fiber as a reinforcement material for epoxy composite. Rice straw fibers were treated with NaOH aqueous solution and silane coupling agent, respectively, before they were applied into epoxy composites. The effect of surface modification and fiber contents on mechanical properties was investigated by flexural and impact tests. Compared with untreated rice straw fiber reinforced epoxy composite, fiber treated with 3% NaOH followed by 3% silane coupling agent showed the highest flexural strength and the maximum flexural strength was obtained at 15% fiber content. The untreated rice straw fiber reinforced epoxy composite, however, showed the highest impact strength as compared to all treated fibers and the maximum impact strength for untreated rice straw fiber filled epoxy composite was also obtained at 15% fiber content. The surface modified rice straw fiber composites exhibited lower water absorption values than those of untreated fiber-based composites.
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