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Effect of UV Treatment on the Physical Properties of Film Formulated with
Polyvinyl Alcohol and Tapioca Starch in the Presence of Sodium Benzoate
Siti Mastura Binti Mochamad Hasem
Supervisor: Dr. Chan Kok Sheng
Bachelor of Applied Science (Electronics and Instrumentation Physics)
School of Ocean Engineering
In this research the physical properties of film formulated with tapioca starch and
polyvinyl alcohol with different composition of sodium benzoate were investigated.
The solution casting technique were used to prepare the films. Then the film produced
expose to UV irradiation for 40 minutes. Sodium benzoate is added as photosensitizer.
Texture analyzer (Stable Micro System TA.XTplus) were used to determine the
mechanical properties of the films. From the tensile test, elongation at break
decreased and tensile strength increased with the increasing of the composition of
sodium benzoate. The Young’s Modulus results also increase in increasing of sodium
benzoate percentage. The Fourier Transform Infrared (FTIR) analysis of the film
showed increasing in intensity of the peak with increasing composition of sodium
benzoate that may indicated the increasing of crystallinity of the films. Increasing in
crystallinity can contribute to stronger mechanical properties. It also showed that with
increasing of sodium benzoate percentage there were several peak shifted to higher
wavenumber that may indicate the stronger structural bonding. The behavior of the
thermal properties of the films were investigated by thermogravimetric analysis and
differential scanning calorimeter. From thermogravimetric analysis it showed that, film
with highest percentage sodium benzoate show highest thermal stability whereas film
with 0% of sodium benzoate showed lowest thermal stability. In conclusion, the
physical properties of the film increasing with increasing in composition of sodium
benzoate.
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