Abstract
Abstract Storage of cellulose solution can be practically ineluctable before it is manufactured into various regenerated products (e.g., fibers, films), especially in the case of industrial production. Therefore, it is necessary to evaluate the effect of storage time and temperature on the dissolved state of cellulose in the interested TBAH-based solvents (including TBAH/H2O, TBAH/H2O/DMSO, TBAH/H2O/Urea), as well as on the mechanical property of the relevant regenerated products (films were prepared in this work for the evaluation). The dissolved state of cellulose in these solvents along with storage has been analyzed with the polarized light microscope photographs and Stormer viscosity. Focus on the interested TBAH/H2O/DMSO solvent, the effect of storage time and temperature on the solution viscosity, and degree of polymerization of cellulose have been discussed. Critical storage time for different storing temperature has been determined, after where significant cellulose degradation happens. A series of regenerated cellulose films with storage time ranging from 0 to 200 h have been prepared. The optimal storage time and strengthening mechanism for cellulose films regenerated from the solution of cellulose/TBAH/H2O/DMSO have been discussed. This work can provide reference about storage time and temperature of cellulose/TBAH/H2O/DMSO, especially for the production of pilot-scale, etc.
Highlights
Cellulose is one of the most abundant and widely distributed biomass materials in the world [1,2,3,4,5]
After a dissolution at 50 rpm for 1 h under 40°C water bath, the cellulose solution dissolved in tetrabutylammonium hydroxide (TBAH)/H2O, TBAH/H2O/dimethyl sulfoxide (DMSO), and TBAH/H2O/Urea solvents had been stored for different time (0–120 h) and sampled for polarized light microscopy (PLM) characterization, as shown in Figures 1–3, respectively
The effect of storage time and temperature of cellulose solution prepared with solvents of TBAH/H2O, TBAH/H2O/DMSO, and TBAH/H2O/Urea on the dissolution state and degradation behavior of cellulose, as well as the viscosity changes of cellulose solution and the mechanical properties of relevant regenerated cellulose films, has been studied
Summary
Cellulose is one of the most abundant and widely distributed biomass materials in the world [1,2,3,4,5]. Evaluating the effect of storage time and temperature on the dissolved state of cellulose in the solvent and mechanical property of relevant regenerated films can be an important issue. The viscosity and activation energy of ILs and their cellulose solution increased exponentially [28] This brings difficulty for the rheological test since the state of dissolution and rheological property is changing along with temperature and time. The effect of storage time on the dissolved state of cellulose in the TBAH-based solvents (including TBAH/H2O, TBAH/H2O/DMSO, TBAH/H2O/ Urea) has been investigated through characterization of polarized light microscope and Stormer viscometer. The influence of storage time and temperature on the mechanical property of relevant regenerated cellulose films has been further studied for the interested TBAH/ H2O/DMSO solvent. It is expected to figure out whether there are the critical storage time and temperature after when significant changes in the structure and performance happen
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