QUIRINO, A. P.; http://lattes.cnpq.br/0841234251177566; QUIRINO, Alberto Porto.
Resumo:
In this effects of different surface treatments on sisal twines
employed in the development of unidirectional continuous reinforced polyester
composites were investigated. The composites were subjected to both pos-cure
and hot water immersion conditions and their mechanical properties were
determined.
The surface treatments on the sisal twines in general reduced their
tensile strength and increased their elastic moduli. The surface treatments
increased the composite's tensile strength which is taken as an indication of better
interfacial adhesion.
Pos-cure caused a reduction on tensile strength and modulus of the
surface modified reinforced composites. Hot water immersion (100°C for 2h) had a
similar effect on the composite's properties except that, in this case, the changes
were more drastic. Composites surface modified with poliol deformed greatly and
did not allow tensile testing to be performed.
Flexural strength of pos-cured composites suffered a 30% reduction,
except for those modified with poliol where a slight increase in this property was
observed.
Pos-cure also reduced the composite's impact properties and this
effect was more severe for the composites in which reinforcement was surface
modified with urethane. The inverse behaviour was observed with poliol modified
composites.