Synthesis and characterization of (hydroxypropyl)cellulose/TiO₂ nanocomposite films

Abstract

A new method of synthesis of TiO 2 nanoparticles as well as preparation of the organic-inorganic hybrid nanocomposite films of (hydroxypropyl)cellulose (HPC)/TiO 2 is presented. At the first stage, the oxotitanium hydrogel phase was obtained by the mineralization of (tetra-isopropyl)orthotitanate (TIPT) modified by the methacrylic acid (MAA) in 15 wt% solution of H 2 O 2 at room temperature and subsequent annealing at the temperature of 85-C. The crystallization of the nanoparticles of TiO 2 was conducted at the oxotitanium hydrogel phase at temperatures around 120-C in the closed vessel. Nanocomposite hybrid films were prepared by the casting method from a solution of HPC and TiO 2 nanoparticles in the water. The films of nanocomposite with 10 mm thickness are transparent to visible light and have a lower glass transition temperature compared with HPC in the bulk. This shift of the glass transition is interpreted in terms of packing density of HPC in the interface of HPC nanocomposite with TiO 2 . The X-ray diffraction pattern of the nanocomposite film suggests a lower amount of mesomorphic phase of HPC in the composite compared with HPC in the bulk.

Cellulosic nanocomposite membranes from hydroxypropyl cellulose reinforced by cellulose nanocrystals

“…The pure HPC membrane shows two characteristic, diffuse and ambiguous peaks at 2h values of 8.6°and 20.4° ( Fig. 3e), in accordance with results published by Halamus et al (2008) and Wojciechowski (2000). Specifically, the broad diffraction band around 2h = 20.4°is related to slightly ordered amorphous phase of HPC, and the narrow diffraction band observed around 2h = 8.6°is attributed to the backbone-backbone d-spacing of the poly(saccharide) main chains in the crystalline phase of HPC, the intensity of which decreases with increasing CNCs content.…”

Recent Progress on Cellulose-Based Electro-Active Paper, Its Hybrid Nanocomposites and Applications

“…The material properties, including the chemical stability, conductivity, photosensitivity, and mechanical properties of cellulose for sensor and electronics applications can be enhanced by adding metal oxides to the cellulose matrix [ 27 , 62 , 63 , 64 , 65 , 66 ]. This hybrid characterization of cellulose based nanocomposites has broadened the applications area of cellulose.…”

Preparation and Characterization of Lactobacilli‐Loaded Composite Films with Sustaining Antipathogenic Activity and Preservation Effect

“…The XRD patterns of HPC (a), KF (b), HPC–KF (c), and HPC–KF– L. paracasei (d) films were shown in Figure . The XRD spectra of pure HPC showed two characteristic peaks at 2 θ values of about 9° and 20° (Figure A), which are separately attributed to the crystalline phase and the ordered amorphous phase of HPC (Halamus, Wojciechowski, & Bobowska, ; Wojciechowski, ). Furthermore, the XRD pattern of KF, a broad hump centered at 2 θ = 20° (Figure B), was characterized by a typical amorphous state on account of the weak molecular interactions and looser molecular arrangement (Heux, Hägglund, Putaux, & Chanzy, ; Li et al., ; Xiao, Liu, Lu, & Zhang, ).…”