| Autor: |
Silva TTD; Department of Materials Science, Military Institute of Engineering-IME, Praça General Tibúrcio 80, Urca, Rio de Janeiro 22290-270, Brazil., Silveira PHPMD; Department of Materials Science, Military Institute of Engineering-IME, Praça General Tibúrcio 80, Urca, Rio de Janeiro 22290-270, Brazil., Ribeiro MP; Department of Materials Science, Military Institute of Engineering-IME, Praça General Tibúrcio 80, Urca, Rio de Janeiro 22290-270, Brazil., Lemos MF; Brazilian Navy Research Institute-IPqM, Materials Technology Group; Rua Ipiru, 02, Cacuia, Rio de Janeiro 21931-095, Brazil., da Silva AP; Brazilian Navy Research Institute-IPqM, Materials Technology Group; Rua Ipiru, 02, Cacuia, Rio de Janeiro 21931-095, Brazil., Monteiro SN; Department of Materials Science, Military Institute of Engineering-IME, Praça General Tibúrcio 80, Urca, Rio de Janeiro 22290-270, Brazil., Nascimento LFC; Department of Materials Science, Military Institute of Engineering-IME, Praça General Tibúrcio 80, Urca, Rio de Janeiro 22290-270, Brazil. |
| Abstrakt: |
Kenaf ( Hibiscus cannabinus L. ) is one of the most investigated and industrially applied natural fibers for polymer composite reinforcement. However, relatively limited information is available regarding its epoxy composites. In this work, both thermal and chemical properties were, for the first time, determined in kenaf fiber reinforced epoxy matrix composites. Through XRD analysis, a microfibrillar angle of 7.1° and crystallinity index of 44.3% was obtained. The FTIR analysis showed the functional groups normally found for natural lignocellulosic fibers. TMA analysis of the composites with 10 vol% and 20 vol% of kenaf fibers disclosed a higher coefficient of thermal expansion. The TG/DTG results of the epoxy composites revealed enhanced thermal stability when compared to plain epoxy. The DSC results corroborated the results obtained by TGA, which indicated a higher mass loss in the first stage for kenaf when compared to its composites. These results might contribute to kenaf fiber composite applications requiring superior performance. |
