ABSTRACT
For the purpose of renewable materials applications, Curauá fiber treated with 5% sodium hydroxide was added to high-density biopolyethylene, using an entirely Brazilian raw material of sugarcane ethanol. Polyethylene grafted with maleic anhydride was used as a compatibilizer. With the addition of curauá fiber, the crystallinity was reduced, possibly due to interactions in the crystalline matrix. A positive thermal resistance effect was observed for the maximum degradation temperatures of the biocomposites. When curauá fiber was added (5% by weight), the morphology showed interfacial adhesion, greater energy storage and damping capacity. Although curauá fiber additions did not affect the yield strength of high-density bio polyethylene, its fracture toughness improved. With the addition of curauá fiber (5% by weight), the fracture strain was greatly reduced to about 52%, the impact strength was also reduced, suggesting a reinforcing effect. Concomitantly, the modulus and the maximum bending stress, as well as the Shore D hardness of the curauá fiber biocomposites (at 3 and 5% by weight), were improved. Two important aspects of product viability were achieved. First, there was no change in processability and, second, with the addition of small amounts of curauá fiber, there was a gain in the specific properties of the biopolymer. The resulting synergies can help ensure more sustainable and environmentally friendly manufacturing of automotive products.
ABSTRACT
O objetivo desse estudo foi avaliar a aceitação do filé do camarão marinho (Litopenaeus vannameii) liofilizado, sob o enfoque da analise sensorial de testes. Foram preparados dois produtos: (1) camarão in natura e (2) camarão liofilizado previamente reidratado, cozido em molho de tomate. Foi também avaliada a intenção de compra, utilizando-se uma escala hedônica de 5 pontos, variando de certamente compraria e certamente não compraria. Os resultados foram submetidos ao teste estatístico t de Student. Na avaliação da interatividade entre os atributos sensoriais e a intenção de compra desenvolveu-se a ACP Análise de Componentes Principais. As notas médias para o camarão não liofilizado e liofilizado para cada atributo avaliado situaram-se acima de 7 e não apresentaram diferença significativa ao nível de 5%. A intenção de compra resultou em valores iguais a 4,1, não havendo, também, diferença significante. Os testes comprovam que o produto desenvolvido é uma nova e rentável alternativa para o mercado brasileiro carente de novidades produzidas a partir do camarão.
