DETERMINATION OF SOME PROPERTIES OF BLENDS OF POLYSTYRENE AND MODIFIED EPOXIDIZED SOYBEAN OIL RESINS

DETERMINATION OF SOME PROPERTIES OF BLENDS OF POLYSTYRENE AND MODIFIED EPOXIDIZED SOYBEAN OIL RESINS

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ABSTRACT

Soybean oil is among the most abundant, biodegradable, renewable and sustainable vegetable oil

in Nigeria that is rich in polyunsaturated fatty-acids, which earned a good candidate for

epoxidaton. However, the epoxidized soybean oil (ESO) alone lacks good thermo-mechanical

properties. Therefore, ESO is synthesized, thermally pre-cured and finally cured with

polystyrene to obtain a blend of good thermo-mechanical properties. The soybean oil sample was

subjected to FT-IR spectroscopy to determine the characteristic bands of functional groups, and

then analyzed to determine the number of carbon-carbon double bond(s) present in 100g of the

oil sample. The result indicated 149.8 as the iodine number. The resultant/determined number of

carbon-carbon double bonds was interpreted in terms of molar equivalent and then

stoichiometrically combined with peracetic acid (formed in-situ) to yield 9.77% oxirane-oxygen

content of the soybean epoxy resin. The resin was subjected to Fourier Transform Infra-Red (FT-

IR) spectroscopy within the frequency range of (400-4000) cm-1. The observable peaks showed

a characteristic band of 843cm-1, 823cm-1 903cm-1 corresponding to internal, external and

terminal oxirane-oxygen rings respectively, with disappearance at peak 3008 and 914 cm-1 at

cis- and trans-, di-substituted olefins in soybean oil sample. The epoxidized soybean oil (ESO)

was cured thermally to yield a gel coded as modified epoxidized soybean oil (MESO). The

MESO was subjected to FT-IR, and the characteristic bands obtained indicated 3400cm-1and

above. The MESO was blended with polystyrene in the ratio of 10/0, 9/1, 8/2, 7/3, 6/4, 5/5, 4/6

PS/MESO respectively. The mechanical properties of the blend were studied and the results

indicated that 6/4 blend of PS/MESO gave highest values of tensile strength (4.3 x 105 Nm-2)

and Young‘s modulus(14.9 x 105 Nm-2) and a lower value of elongation at break 29%.

Viscometric study of the blends were carried out and the results affirmed that the blend at 6/4

v


PS/MESO composition gave the additive value of R2 from both relative and reduced viscosity

measurements respectively. The study showed that thermally cured resin of soybean oil is

compatible with polystyrene and thus, at 6/4 PS/MESO composition, serves as reinforcement to

polystyrene matrix.

CHAPTER ONE

1.1       INTRODUCT


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