Preparation and characterization of a transparent amorphous cellulose film

Abstract

Amorphous cellulose film (ACF) was prepared from cellulose solution in lithium chloride (8 wt%)/N,Ndimethylacetamide by regeneration with acetone. The obtained ACF possessed a dense, smooth surface, and excellent transparency. The X-ray diffraction results indicated that ACF was highly amorphous, which was further confirmed by solid-state 13 C-NMR and Fourier transform infrared (FT-IR) spectra. The tensile analysis implied that the elongation at break (23.9%) and the maximum stress (157 MPa) of ACF derived from the Whatman CF11 fibrous cellulose were higher than those of cellophane (19.9% and 135 MPa, respectively). In addition, the enzymatic hydrolysis of ACF and cellophane showed that the former had a higher hydrolysis rate (about 7 times higher than the latter), indicating its outstanding environmental friendliness. This work provides a simple, less-destructive, and universal method to prepare transparent ACF, which could serve as a promising packaging material to replace cellophane.

Properties of bacterial cellulose transparent film regenerated from dimethylacetamide-LiCl solution

“…[30,31] In addition, absorbance at 3340 cm À1 in the native BC was blue shifted to 3354 cm À1 accompanied by broadening, in accordance with the previous observations. [8] In the cases for I β rich plant celluloses, similar shift was observed in the higher wavenumber region from 3352 to 3472 cm À1 . [31] In this region, stretching vibrations because of free OH (3458 cm À1 ), hydrogen bonded C 3 OH (3336 cm À1 ), and hydrogen bonded C 2 OH (3267 cm À1 )…”

“…[7] Recently, Zhang et al developed a method for preparation of amorphous cellulose films with excellent transparency from dimethylacetamide (DMAc)-lithium chloride (LiCl) solutions by using acetone as the regeneration solvent. [8] Although applicability of this method to BC is briefly mentioned in this report, no detailed description was explained by using the BC sheets usually prepared in Southeastern Asia countries including Indonesia. Matsumoto et al also reported that the solution of BC in the DMAc-LiCl exhibits optical anisotropy and has a different viscosity behavior from plant origin celluloses, [9] but did not refer to the film formation.…”

Lignin and Cellulose Extraction from Vietnam’s Rice Straw Using Ultrasound-Assisted Alkaline Treatment Method

“…Smaller quantities are converted into a wide variety of derivative products such as cellophane and rayon [1,2]. Conversion of cellulose from energy crops into biofuels such as cellulosic ethanol is under investigation as an alternative fuel source [3][4][5].…”

Coated and uncoated cellophane as materials for microplates and open-channel microfluidics devices

“…vii) It has excellent optical transparency-comparable to glass and most plastics -over the entire visible range, as well as in the UV range. 16 Paper microfluidic systems 4,17 are based on the spontaneous wicking of liquids (especially water and aqueous buffers) through the porous matrix of cellulose-based paper, often through a fluid path defined by hydrophobic wax barriers. 18 Widely used analytical methodologies such as electrochemical monitoring of glucose, and lateral flow immunoassays were the first (and still largest volume) paper-based devices to enter large-scale fabrication (unless we count simple sensing paper strips).…”