Effect of Zn-Cyclen Mimic Enzyme on Mechanical, Thermal and Swelling Properties of Cellulose Nanocrystals/PVA Nanocomposite Membranes

Abstract: In this work, the effect of Zn-cyclen mimic enzyme on the properties of poly(vinyl alcohol)/cellulose nanocrystals (PVA/CNC) nanocomposite membranes have been studied at three different relative humilities (0%RH, 53%RH and 93%RH). Different amounts of mimic enzyme were incorporated, and membranes were prepared by solution casting. The fabricated nanocomposite films were characterized by X-ray Diffraction, Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy. The results revealed good interfacial interactions between the constituents. The membranes showed enhanced uptake of moisture, with increasing mimic enzyme concentration as well as humidity. The membranes demonstrated the ability to uptake moisture for almost 4 days. The mechanical properties showed an opposite trend as expected. Tensile strength, tensile modulus and dynamic mechanical properties declined with increase in humidity along with mimic enzyme amount. The highest elastic modulus i.e. 33 MPa was found at the lowest humidity i.e. 0%RH for the pure PVA membrane. Similarly, the maximum tensile strength of 118 MPa was found at the similar conditions for the same formulation. The obtained results suggested the potential application of PVA/CNC and mimic enzyme membranes in CO₂ separation_. Graphic Abstract: [Figure not available: see fulltext.]