Suki, Fairus Mazlia Mat
(2014)
Preparation And Properties Of Polyvinyl Alcohol/Soya Bean Flour Biodegradable Film.
Masters thesis, Perpustakaan Hamzah Sendut.
Abstract
In this research, a new polymer blend based on soya bean flour (SBF) and polyvinyl
alcohol (PVA) was prepared using solution casting method. Initially, the SBF content was
varied from 10 to 40 wt %. Tensile strength and elongation at break of the PVAlSBF blend
films were lower, but the tensile modulus was higher than that of unfilled PVA film. This was
mainly because of the presence of SBF in the blend. The PVAlSBF blend films showed
higher water barrier properties with increasing SBF content. Biodegradability tests revealed
that the presence of SBF stimulated the degradation rate and caused the weight loss of the
PVAlSBF blend films. Secondly, the effectiveness of hexamethylenetetramine (HMTA) as
crosslinker on PVAlSBF blend films was compared to the non crosslinked PVA/SBF blend
films. The crosslinked PVAlSBF blend films showed better tensile and water barrier
properties. This was attributed to the effectiveness of HMTA in the blend. Natural weathering
test revealed that the presence of HMTA did not significantly affect the weatherability of the
PVAlSBF blend films. But, in soil burial test the weight loss of non-crosslinked blend films
was higher than crosslinked blend films. Thirdly, banana frond flour (BFF) and halloysite
nanotubes (I-INT) were added as filler to form ternary blend system. PVAlSBF/HNT blend
films show better properties in tensile and water barrier because HNT have higher aspect
ratio and provided more interaction sites. Degradability for both blend films were increased
with increasing filler content after subjected to degradation test. Lastly, BFF was treated by
alkaline treatment. Better tensile and water barrier properties were obtained by the treated
PVAlSBF/BFF blend films. This result might due to the better compatibility and interaction
of treated BFF and PVAlSBF matrix. Besides that, the higher water barrier properties of
treated PVAlSBFIBFF blend films were contributed to reduction of the film degradation.
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