Makara, Lay
(2013)
The Effect Of Nanosilica Filler On Curing Characteristics,
Mechanical And Morphological Properties Of Standard
Cambodian Natural Rubber Nanocomposites.
Masters thesis, Universiti Sains Malaysia.
Abstract
Nanosilica (NS) and maerogel, which are mesoporous light solid materials,
low bulk density, low thermal conductivity, and high surface area with
microstructure network consists of nano sized pore. NS was used as filler in Standard
Cambodian Rubber (SCRL) nanocomposites. 3 phr of NS filler showed a shorter CRI
with higher tensile strength and Elongation at break than maerogel filler. The
addition of silane coupling agents; Bis[3-(triethoxysilyl)propyl] tetrasulfide (Si69)
and (3-aminopropy)triethoxysilane (APTES) with 3 phr of NS reduced silanol group
during mixing process as observed from FTIR spectrum. Its provided short cured
time due to the presence of amine groups in APTES. The optimum loading of 1.5 phr
of APTES and 3 phr of NS were carried out with different curing systems (CV and
Semi-EV). Before ageing, CV system showed higher tensile strength with significant
decrease in tensile strength after ageing compared to Semi-EV system. Semi-EV
system exhibited shorter cured time and better thermal stability compared to CV
system due to high amount of accelerator with stable crosslinking. The hybrid filler
of NS/mica with 1.5 phr of APTES gave the enhancement on mechanical properties
of SCRL composites than hybrid fillers of NS/CaCO3 and NS/china clay due to the
nature ability of mica to enhance modulus and tensile strength of SCRL composites.
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