Effect of cross linking of PVA/starch and reinforcement of modified barley husk on the properties of composite films

Published Date
Carbohydrate Polymers
20 October 2016, Vol.151:926–938, doi:10.1016/j.carbpol.2016.06.037

Author 

• Aanchal Mittal ^a,
• Sangeeta Garg ^a,,
• Deepak Kohli ^a
• Mithu Maiti ^b
• Asim Kumar Jana ^c
• Shailendra Bajpai ^a

• aDepartment of Chemical Engineering, National Institute of Technology, Jalandhar 144 011, Punjab, India
• bDepartment of Chemistry, National Institute of Technology, Jalandhar 144 011, Punjab, India
• cDepartment of Biotechnology, National Institute of Technology, Jalandhar 144 011, Punjab, India

Received 10 March 2016. Revised 8 June 2016. Accepted 9 June 2016. Available online 9 June 2016. 

Highlights

• •
  Palmatic acid was grafted onto barley husk using graft copolymerization.
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  Effect of cross linking of PVA/St and reinforcement of BH on the properties of films was evaluated.
• •
  Tensile strength increased significantly in grafted BH composite film compared to PVA/St film.
• •
  Degradation rate of natural BH composite film was faster than PVA/St film.

Abstract

Barley husk (BH) was graft copolymerized by palmitic acid. The crystalline behavior of BH decreased after grafting. Poly vinyl alcohol (PVA)/starch (St) blend film, urea formaldehyde cross linked PVA/St films and composite films containing natural BH, grafted BH were prepared separately. The effect of urea/starch ratio, content of BH and grafted BH on the mechanical properties, water uptake (%), and biodegradability of the composite films was observed. With increase in urea: starch ratio from 0 to 0.5 in the blend, tensile strength of cross linked film increased by 40.23% compared to the PVA/St film. However, in grafted BH composite film, the tensile strength increased by 72.4% than PVA/St film. The degradation rate of natural BH composite film was faster than PVA/St film. Various films were characterized by SEM, FT-IR and thermal analysis.

Keywords

PVA/St films

Cross linked film

Barley husk

Palmitic acid grafting

Composite film

Mechanical properties

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  Corresponding author.
  
  

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