Physico-Chemical Properties of a Hybrid Biomaterial (PVA/Chitosan) Reinforced with Conductive Fillers

Abstract

In this study, a novel hybrid material based on Polyvinyl Alcohol-Chitosan (PVA-Chi) was made, reinforced with conductive fillers such as the polypyrrole (PPy), Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS), carbon black (CB), and multi-wall carbon nanotube (MWCNT). In order to observe the mechanical and electrical responses of this composite material, for obtaining composite materials, and to characterize them for the development of applications in engineering, FTIR analysis made clear the different functional groups present in the matrix and the fillers used. Using quaternary mixtures (4 fillers) increased the contact angle, which increased hydrophobicity of the biocomposite. The Nyquist diagram of the analyzed samples showed a decrease in resistance and energy diffusion; the latter because of transferring electrons caused by the conductive polymers CB and the MWCNT. In the mechanical tension tests, Young’s modulus values of 18.386 MPa were obtained, in contrast with the material matrix of PVA-Chi, which showed values of 11.628 MPa. Morphological analysis by SEM showed the materials got were homogeneous. The materials got showed higher electrical conductivity in the OH’s presence and NH2 groups, which could have possible applications in biopolymer electrodes.

Self-Supporting Flexible Enzyme-Free Sensor Based on CoS-PPy-CP for Glucose Detection

“…Moreover, the peak at 892 cm −1 was ascribed to the vibration of the C=S bond. [30][31][32] We can observe that in the curve a in Fig. 3D, there are three characteristic peaks at 1351 cm −1 , 1582 cm −1 , and 2699 cm −1 , which are assigned to the D, G, and 2D peaks of the carbon paper, respectively.…”

Egg shelf life can be extended using varied proportions of polyvinyl alcohol/chitosan composite coatings

“…One of the most interesting results in these studies concerned the interaction between CH and PVA. Olarte‐Paredes et al ( 2021 ) reported that CH improves the mechanical properties of PVA; indeed, it increases its Young's modulus. These results were concordant with our findings, with this explanation that the best mechanical properties were observed in the CH/PVA 25:75 wt%, as reflected in the egg internal quality parameters.…”

“…SEM images of blended coatings demonstrated a lower porosity surface morphology at CH/PVA as compared to others. One of the most likely reasons for these results may be that PVA/CH material has synergistic properties and there is good adhesion between the PVA/CH materials (Olarte‐Paredes et al, 2021 ). However, when the CH proportion is increased, it appears slightly as rough areas, due to the CH molecules disrupting the compact structure of the PVA coating (Liu et al, 2017 ).…”

“…The functionality purpose of blending chitosan with PVA is to maximize composite coating performance (Wardhono et al, 2022 ). It was reported that chitosan improves the mechanical properties of PVA by increasing Young's modulus (Olarte‐Paredes et al, 2021 ). Meanwhile, Wardhono et al ( 2022 ) reported that PVA improved the chitosan films' tensile strength and elongation at break.…”

Structural Characterization and Dielectric Properties of Flexible PVA/PANI/Ag Nanocomposite Materials

“…16,17 Many studies have been conducted in order to overcome PANI's solubility in water and degradation rate by using polyvinyl alcohol (PVA) to create a stable PANI dispersion. 18 PVA, in instance, has high mechanical strength and chemical endurance, making it a popular choice to be used as additive. 19 PVA also has a wide spectrum of uses due to its has a carbon chain, which is expected to be a powerful source of bonds formation.…”