Journal of Materials Science and Engineering with Advanced TechnologyAuthor's: Clarissa Coussirat Angrizani, Branca Freitas De Oliveira and Sandro Campos Amico
Pages: [31] - [47]
Received Date: May 31, 2015
Submitted by:
DOI: http://dx.doi.org/10.18642/jmseat_7100121507
Polymeric composite materials present modification of its physical and
mechanical properties when exposed to aggressive environments (heat,
humidity, ultraviolet radiation, etc.) and this is a serious concern
for the manufacturers of composites. Unlike metallic materials
knowledge about changes in the properties and characteristics due to
degradation environments are still unknown. The level of deterioration
depends on the environment and the period to which the material would
be exposed. Degradation of polymeric composites can be physical or
chemical. The physical degradation is characterized by the ability of
the material returns to its original state after being exposed to a
hygrothermal ageing after it returns to their original properties
after drying. In this context, the aim of this work is to study the
influence of accelerated hygrothermal ageing on glass/epoxy
unidirectional composite two temperatures. The composites were molded
by resin transfer moulding (RTM) with a fiber volume fraction
(Vf) of 
and characterized by water absorption, DMA,
TGA and short-beam shear strength (at fiber orientation of 0° and
90°). Comparing water absorption at 50°C and 80°C, it was
observed that only the last stabilized. The weight loss may be due to
the dissolution of the fiber sizing or unreacted components of the
matrix. In the short-beam strength testing, when comparing the samples
exposed to 50°C and 80°C, it was observed the possible
occurrence of physical degradation (plastification) of the first and
second chemical (crosslink second of the matrix). The complexity of
the ageing study of composite is due to the fact that a slight change
in magnitude of any variable can produce very different results.
degradation, hygrothermal aging, unidirectional composite.
