Osman, Muhammad Razak
(2014)
The Effect Of Natural Weathering Exposure And Hygrothermal Aging On The Properties Of Pultruded Hybrid Glass/Kenaf Fibre Reinforced Unsaturated Polyester Composites.
Masters thesis, Perpustakaan Hamzah Sendut.
Abstract
By using pultrusion technique, three types of pultruded composites at 70
V/V% fibre loading have been produced which are pultruded kenaf fibre reinforced
unsaturated polyester composites (PKRC), pultruded glass fibre reinforced
unsaturated polyester composites (PGRC) and pultruded glass/kenaf fibre hybrid
reinforced unsaturated polyester composites (PGKRC). The objective of this study is
to determine the behavior of PGKRC as compared to PKRC and PORC after being
subjected to natural weathering exposure of 200 days and six weeks of hygrothermal
aging in distilled water at 65°C. In natural weathering exposure study, PGRC
specimens recorded the least absorbed moisture while PKRC specimens showed the
highest. PGKRC specimens took place in between these two specimens but closer to
the PGRC instead of PKRC. Similar pattern were observed in the hygrothermal
aging study. Flexural and compression tests carried out on all the three types of
specimen had shown a decrement in mechanical properties after a prolonged
exposure. Moisture invasion is the major factor that weakened the fibre-matrix
interfaces which led to mechanical properties reduction and it acts differently for
different types of pultruded composites due to the nature of the constituent fibres and
the arrangement of the pultruded hybrid composites. The effects of different layering
pattern in PGKRC were also studied and concluded based on the resulted mechanical
properties.
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