Open AccessImproving Mechanical and Morphological Characteristics Pva/Sio2Nanocomposites for Food Packing Applications
Author(s) -
Ohood Sabr,
Asra Ali Hussein,
Massar Najim Obaid
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1094/1/012146
Subject(s) - crystallinity , ultimate tensile strength , materials science , nano , nanocomposite , polyvinyl alcohol , composite material , fourier transform infrared spectroscopy , elongation , differential scanning calorimetry , surface roughness , chemical engineering , physics , engineering , thermodynamics
This study deals with using nano-SiO 2 to enhance the characteristics of PVA for food packing applications. Thin-film of Polyvinyl alcohol (PVA)/nano-silica (nano-SiO 2 ) was prepared by adding different weights of silica (0, 5, 7, 9) wt. %. Differential scanning calorimetry, atomic force microscopy (AFM), FTIR, and mechanical properties such as tensile strength, modulus, elongation at break, and micro-hardness used to examine the characteristics of PVA/nano-SiO 2 films. The results revealed a dramatic improvement in the PVA/nano-SiO 2 mechanical properties, increasing nano-SiO 2 content to 7 wt %, the value of tensile strength increasing from 62 MPa to 143 MPa. While increasing SiO 2 content to 9 wt.%, the tensile strength decreased to 65 MPa. The study also showed that the value of elongation at break and modulus of elasticity of film increment with increases in the nano-SiO 2 content. There was also an increase in the crystallinity from 0.97 (for pure PVA) to 1.154 at 7wt. % nano-SiO 2 . Crystallinity, however, decreased to 0.012 with the increase of SiO 2 to 9 wt. %. FTIR results revealed that there was physical interaction between nano-SiO 2 and PVA. AFM result showed less roughness at 7wt. % from nano-SiO 2 . Generally, the results showed that the concentration of 7% of the nano –SiO 2 in thin films resulted in a significant improvement in the mechanical properties of the films. These findings suggest that nano-SiO 2 can be useful as food packaging material to maintain food quality.