Compósitos poliéster-juta: efeitos de modificações químicas no reforço e na matriz poliéster.

Abstract

In this deals couth unsaturated polyester / jute composites reinforced by jute yarns having two different diameters. Tensile, flexural, toughness and Izod impact tests were conducted at room temperature. The influence of three different kinds on fiber surface treatments and of matrix modification on the conventional mechanical as well as on the fracture toughness of the polyester / jute composites were investigated. Our results indicate that the yam diameter as well as the surface treatment employed affected the composite's behavior. In general, composites reinforced with jute yarns having 0.8 mm ( 10/2 ) exhibited superior in conventional mechanical properties than those, reinforced with jute yarns of 1,4 mm in diameter ( 10/4 ) Izod impact strength of the composites increased with fiber content. Fracture toughness testing were conducted according with ASTM E- 399 rules with 3-point bending specimens. The polyester / jute composites were tougher that the matrix and composites reinforced with thicker yarns ( 1 0 / 4 ) were tougher than those reinforced with thinner yarns ( 10/2 ).