Crystallographic Investigation of PVA@PLA Nanocomposite Film by X-ray Diffraction: Insight from High Resolution TEM

Abstract

PLA-PVA films have desirable unique, unparalleled properties such as good oxygen and moisture barrier, excellent mechanical strength and low toxicity. The biodegradability of PLA and PVA offers a sustainable alternative to traditional plastic packaging. The PLA-PVA film stacking technology and its potential benefits for sustainable packaging. The XRD pattern of PVA exhibited sharp diffraction peaks at 20.0 ° and 41.0 °, reflecting its semi-crystalline nature, with the peak at 20.0 ° where a main diffraction of PLA was found around 16.5 °. PVA generally crystallizes in the monoclinic unit cell with dimensions of a= 7.81 Å, b= 2.52 Å, c= 5.51 Å, and α=γ= 90.0 °, and β= 91.70 °. PLA depicted semi-crystalline synthetic polymer with α form which most stable polymorph with shape an orthorhombic unit cell. Taking two typical spacing showed in 0.40 ± 0.02 nm and 0.26 ± 0.03 nm acquired from HR-TEM interface accord with (200) and (002) Miller indices of PVA. The HR-TEM images also computed the d-spacing of PLA 0.340 nm with respective fringe. SEM is used to obtain the morphology such a nanostructure PVA-PLA composite materials. The size, shape, purity, surface morphology and distribution of PLA-PVA composite were explored by SEM. The research explores the structure and properties of biodegradable PVA-PLA nanocomposite films using XRD, SEM and HR-TEM. The findings reveal how these materials can be made stronger and more sustainable, making them ideal for eco-friendly packaging.