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Preparation and Properties of Propylene Glycol Plasticized Wheat Protein Isolate Novel Green Films

机译:丙二醇增塑小麦蛋白分离新型绿色薄膜的制备及性能

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摘要

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.
机译:使用溶液分离法,使用丙二醇作为增塑剂,通过溶液流延法,使用小麦蛋白分离物(WPI)制备了新型的生物基绿色薄膜。研究了增塑剂含量(10、15、20和25 wt%)对机械性能(拉伸强度,杨氏模量和伸长%)的影响。通过TGA和DSC分析评估了制备的WPI的热降解和相变。结果表明,随着PG含量的增加,抗拉强度和杨氏模量下降,伸长率增加。 ATR-FTIR和SEM分别用于薄膜的结构表征和形貌。 FTIR研究表明,对应于酰胺基团的条带强度随着PG含量的增加而增加,并倾向于增加蛋白质-PG的相互作用。此外,玻璃化转变温度降低,并且发现WPI的热稳定性通过增塑而增加。薄膜的整体热稳定性得到了改善,这归因于聚合物链迁移率的提高。

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