Hydroxyethyl cellulose (HEC) fibers with low degree of substitution were prepared by wet spinning of solutions in 8wt% NaOH solvent, and HSO/NaSO/ZnSO solution was chosen as coagulants. The influence of coagulation temperature and HSO concentration on structure and mechanical properties of resultant HEC fibers was examined by synchrotron X-ray measurements, scanning electron microscope and tensile tests. The results were analyzed from the perspective of coagulation kinetics by determining coagulation rate and mass transfer rate difference. It is shown that the increase of either coagulation temperature or HSO concentration would accelerate the diffusion and coagulation process. The lowest coagulation temperature of 20°C or moderate HSO concentration around 10-15wt%, which provided a gentle solidification process, favored the development of regular crystal and oriented structure, uniform and dense inner structure as well as cross sections closer to circular, resulting in HEC fibers with better tensile properties.
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| http://dx.doi.org/10.1016/j.carbpol.2017.01.054 | DOI Listing |
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