Temperature Effect of Water Coagulation Bath on Chitin Fiber Prepared through Wet-Spinning Process

Abstract

Chitin was chemically extracted from crab shell waste and dissolved in N,N-dimethyl acetamine/5% lithium chloride (DMAc/5% LiCl) at room temperature to obtain 1% and 2% concentrations of chitin solution. Chitin fibers were prepared by phase inversion at different temperatures of water coagulation bath at 5, 20, and 60 °C. The deconvolution of FTIR spectra indicated that the area portion of the intermolecular hydrogen bonding NH…OC increased at 60 °C due to the higher density of the chitin segment in the fiber. As a result, scanning electron microscope (SEM) measurement suggests that a denser structure of the chitin fiber was observed when the temperature of the coagulation bath increased. In addition, the resultant chitin fibers generated better mechanical properties relative to the amount of chitin concentration and temperature. At 2% of chitin solution, the tensile strength significantly increased from 80 to 182 MPa for the fiber obtained at temperatures of 5 and 60 °C of the water coagulation bath, respectively. Meanwhile, the water content in the fiber significantly decreased from 1101% to 335%. This green synthesis route has high potential for the fabrication of the fiber as future material of interest for biomedical application.

Facile Fabrication of Highly Oriented Dense Ti3C2 Fibers with Enhanced Strength and Supercapacitance Performance by Coagulation Condition Tuning

“…The solidification boundary starts at the surface of the solution and goes inward until it reaches the center of the coagulating filament. The bath temperature can control the growth rate of this boundary. − As demonstrated in Video S1, the Ti 3 C 2 dispersion extruded into the bath (5 wt % CaCl 2 in a mixture of IPA/DI water at 6.3 mm s –1 ) at room temperature could not even fully shape into a fiber due to the fast coagulation rate. To reduce the rate, we cooled the bath until observed continuous fibers at 5 °C (Figure S6).…”

Alginate-Based Bio-Composites and Their Potential Applications

“…After an appropriate immersion time, the calcium alginate filaments can be washed in a bath of demineralized water. These obtained filaments can then be stretched and dried at a temperature of 80 °C [ 40 ].…”