Physicochemical and Structural Properties of Green Biofilms from Poly (Vinyl alcohol)/Nano Coconut Shell Filler

ABSTRACT

There is growing interest in recent times to develop biodegradable films with improved properties. They are potential substitutes for existing petroleum-based synthetic polymers. Eco-friendly biofilms based on Poly (vinyl alcohol)/Nano coconut shell filler (PVA/NCSF) were primed by a solution casting method. The biofilms were characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis, Tensile test, FESEM, Transparency Water absorption, biodegradability test, and tensile testing. FTIR and XRD results revealed the structural characterization and crystallinity index of prepared PVA/NCSP biofilms. FTIR suggested that strong hydrogen bonding due to interfacial exchanges of PVA/NCSF. Thermogravimetric analyses revealed thermal degradation temperatures of biofilms that were observed between 259.79°C and 350°C. The tensile strength and elastic modulus were enhanced by 25.5% and 97.25%, respectively, when NCSF was added at 25 wt% level. It is intriguing that % of elongation linearly decreased with the incorporation of filler. The FESEM results evident that good compatibility between PVA and NCSF. The water absorption of PVA/NCSF biofilms slightly increases with increase in the NCSF content. Soil burial test results evident that 34% weight loss of biofilms (25 wt% of NCSF) due to NCSF loading in PVA Matrix. Taken together, the present study confirmed that PVA/NCSF biofilms can be a potential for packaging applications.

摘要

近年来，人们对开发性能更好的可生物降解薄膜越来越感兴趣. 它们是现有石油基合成聚合物的潜在替代物. 以聚乙烯醇/纳米椰壳填料（PVA/NCSF）为基料，采用溶液浇铸法制备了环保型生物膜. 通过FTIR、XRD、TGA、拉伸试验、FESEM、透明吸水率、生物降解性试验和拉伸试验对生物膜进行了表征. FTIR和XRD分析结果表明，制备的PVA/NCSP生物膜具有良好的结构表征和结晶性能. FTIR分析表明，PVA/NCSF的界面交换导致了较强的氢键作用. 热重分析显示生物膜的热降解温度在259.79℃到350℃之间. 当NCSF质量分数为25%时，拉伸强度和弹性模量分别提高了25.5%和97.25%. 有趣的是，随着填料的加入，延伸率呈线性下降。FESEM结果表明PVA与NCSF具有良好的相容性. 随着NCSF含量的增加，PVA/NCSF生物膜的吸水率略有增加. 土壤埋藏试验结果表明，在PVA基质中加入NCSF后，生物膜的失重率为34%（25%NCSF）. 综上所述，本研究证实了PVA/NCSF生物膜在包装领域的应用潜力.

KEYWORDS:

• Biodegradable
• biofilms
• thermal stability
• mechanical properties
• crystallinity
• packaging

关键词:

• 可生物降解
• 生物的电影
• 热稳定性
• 机械性能
• 结晶度
• 包装