Journal
JOURNAL OF POLYMERS AND THE ENVIRONMENT
Volume 21, Issue 4, Pages 930-936Publisher
SPRINGER
DOI: 10.1007/s10924-013-0572-4
Keywords
Propylene Glycol; Plasticizer; Wheat protein isolate (WPI); Eco-friendly materials; Mechanical Properties and packaging applications
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Funding
- National Research foundation of Korean (NRF)
- Korean Government (MENT) [2011-0030804]
- Changwon National University, South Korea
- National Research Foundation of Korea [2011-0030058, 2011-0030804] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Novel bio-based green films were prepared using wheat protein isolate (WPI) by solution casting method using Propylene Glycol as a plasticizer for packaging applications. The effect of the plasticizer content (10, 15, 20 and 25 wt%) on mechanical properties (tensile strength, young's modulus and % of elongation) was investigated. A thermal degradation and phase transition of the prepared WPI was assessed by means of TGA and DSC analysis. The results showed that the tensile strength and young's modulus decreased and % of elongation increased with increasing PG content. The ATR-FTIR and SEM were used for structural characterization and morphology of the films, respectively. FTIR studies reveals that the intensity of the bands corresponding to the amide groups increases with increasing PG content tending to increase protein-PG interactions. Further, the glass transition temperature was decreased and the thermal stability of the WPI was found to be increased by plasticization. The overall thermal stability of the films was improved and is attributed to the increase in mobility of the polymer chains.
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