Studies on the effect of addition modified sago starch on mechanical properties of natural rubber and synthetic polyisoprene latex films
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Date
2018-06
Authors
Nurul Fazliniza So'od
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Abstract
This research is formulated to study the effect of addition of modified sago starch
(dextrine) on the mechanical properties of natural rubber (NR) and synthetic polyisoprene
(PI) latex films. This works involved comparison of different loading of modified sago
starch at 10,20 and 30 phr in NR and PI latex compounds. The effect of post processing
parameters in NR and PI latex films was also investigated. The leaching process using
tap water was carried out for 30 minutes at room temperature and accelerated aging
process was carried out at 100°C for 3 days. Modified sago starch was prepared in the
aired oven for 8 hours at 150°C prior to dispersion of modified sago starch. Then latex
compounding was carried out into flat-bottomed flask at 70°C. After compounding,
dipping and drying processs were conducted to produce latex films. The mechanical
properties( tensile properties and tear strength) were carried out to all the films by using
Instron machine. Based on the results obtained, 10 phr loading of modified sago starch
showed increased in tensile strength and elongation at break for NR while elongation at
break for PI latex films. For post processing, leaching process has improved the
mechanical properties of PI latex films due to removal of unreacted rubber compounding
ingredients in the PI latex. Ageing resulted in decreased of mechanical properties of PI
latex films due to breakage of sulphur crosslinks that exposed in high temperature.