Physico–chemical and Tensile Properties of Green Bio-films from Poly (Vinyl Alcohol)/Nano Ground Nutshell Filler

ABSTRACT

Totally six composite bio-films were produced through a simple solution casting technique by varying the weight percentage (0, 5, 10,15, 20, 25 wt.%%) of the filler material (ground nutshell (GNS) powder) and matrix (Polyvinyl Alcohol (PVA)). Before making the bio-film GNS was characterized through particle size analysis and chemical analysis. Composite biofilms were characterized by X-ray Diffraction analysis, Fourier-transform infrared spectroscopy, Thermogravimetric analysis and tensile testing. The Fourier-transform infrared spectroscopy analysis results established that complete dispersion of GNS in PVA. X-ray Diffraction analysis results pronounced that the crystallinity index of the films was improved when increasing in the filler content. Derivative thermogravimetric curve was also visualized that maximum degradation temperature of the films was improved from 287°C (Controlled PVA) to 337°C (25% GNS/PVA Film). The tensile strength of the bio-films was increased and elongation at break of the bio-films was decreased while increasing the GNS content. The obtained results were clearly showed that the PVA/GNS composite bio-films were suitable materials to produce packaging applications.

摘要

通过改变填充材料(花生壳粉)和基质(聚乙烯醇)的重量百分比(0,5,10,15,20,25wt.%)制备了六种生物复合膜. 在制备生物膜之前,通过粒度分析和化学分析对GNS进行了表征. 采用X射线衍射分析、傅立叶变换红外光谱、热重分析和拉伸试验对复合生物膜进行了表征. 傅立叶变换红外光谱分析结果表明GNS在PVA中完全分散. X射线衍射分析结果表明，随着填料含量的增加,薄膜的结晶度指数提高. 微分热重曲线显示,薄膜的最高降解温度由287℃(控制聚乙烯醇)提高到337℃(25%GNS/PVA膜). 随着GNS含量的增加,生物膜的拉伸强度提高,断裂伸长率降低. 结果表明,PVA/GNS复合生物膜是一种适合于包装应用的材料.

KEYWORDS:

• Ground nutshell powder
• Poly vinyl Alcohol (PVA)
• TGA analysis
• FT-IR
• tensile strength
• solution casting

关键词:

• 果壳粉
• 聚乙烯醇(PVA)
• 分析
• 抗拉强度
• 溶液浇铸