Bakar, Azizah Abu
(2018)
Preparation And Characterization Of
Polyurethane Composites Reinforced
By Kenaf Core.
PhD thesis, Universiti Sains Malaysia.
Abstract
In this study, the effect of silane treatment on kenaf core (KC) and KC
reinforced polyurethane (KCP) composites were discussed. The composite was
prepared using one shot process. Firstly, polyurethane (PU) was prepared from
methylene diphenyl diisocyanate (MDI) and glycerol using different NCO/OH ratio
and KCP composites with different KC loadings were prepared using a suitable
NCO/OH ratio. From the mechanical properties measurement, it was found that
NCO/OH ratio of 1.5 and KC loadings of 20% were suitable to be studied. In the
next phase, KC was treated with different types of silane (1 – 3%); which were
vinyltrimethoxysilane (VTMS), trimethoxyphenylsilane (TMPS), and tetramethoxy
orthosilicate (TMOS) using hydrolysis method with ethanol/water (80:20 volume) as
silanization medium for KC The properties of untreated KC (UKC) and treated KC
(TKC) were investigated through filler morphology analysis, Scanning Electron
Microscopy – Energy Dispersive X-ray (SEM – EDX) mapping element analysis,
Fourier Transform Infrared (FTIR) analysis, and Thermogravimetric Analysis (TGA)
analysis. UKC and TKC surface morphology and SEM – EDX mapping analysis
showed the presence of Si element on the TKC surface. Thermal analysis revealed
that, silane treatment had enhanced the thermal stability. The visco-mechanical
properties of kenaf core treated with silane – polyurethane (TKCP) composite were
measured by Dynamical Mechanical Analysis (DMA).
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