Preparation, structure, and properties of melt spun cellulose acetate butyrate fibers

Abstract

The melt spinning of cellulose acetate butyrate (CAB) without any additives is realized according to the thermal and rheological properties of cellulose acetate butyrate raw material. Thermogravimetric analysis reveals that thermal degradation of cellulose acetate butyrate occurs at 275℃ in oxygen. Rheological tests show that cellulose acetate butyrate is a strong shear thinning pseudoplastic fluid. The melt viscosity of cellulose acetate butyrate is found to be relatively sensitive to temperature change and cellulose acetate butyrate melt is difficult to flow until the temperature reaches 230℃. However, thermal degradation of cellulose acetate butyrate during spinning cannot be completely avoided even when the spinning temperature is 230℃. The orientation of cellulose acetate butyrate fibers can be improved by increasing the spinning draw ratio during the spinning process or by hot drawing during the drawing process. Crystallization of cellulose acetate butyrate fibers is facilitated by improving molecular orientation. Owing to the improved orientation and crystallinity, the tensile strength and initial modulus of cellulose acetate butyrate fibers are enhanced. The cellulose acetate butyrate fiber achieves the highest degree of orientation and crystallinity by drawing at 135℃, showing the highest tensile strength at 1.42 cN/dtex. Moreover, dyeing experiments show that the cellulose acetate butyrate fiber can be dyed with a disperse dye and the suitable dyeing temperature is in the range of 80∼90℃.

Organophosphate-Cyclodextrin Inclusion Complex for Flame Retardancy in Doped Cellulose Acetate Butyrate Melt-Spun Fibers

“…18 Following this development, it was also found that CAB with 35−40% butyryl content is especially suited to molding applications. Wang et al 23 performed the melt spinning of pure CAB fibers and reported some important insights about the fiber properties. Although CAB fibers degraded at 275 °C in the presence of oxygen from TGA measurements, melt spinning at and beyond 230 °C could not be performed, owing to thermal degradation.…”

Synthesis of Thermoplastic Mixed Chitin Esters

“…Thus, the derivative shows a lower viscous flow temperature, and accordingly, better melt processability than CTA, leading to superior thermoplasticity. 10 Compared with such cellulose ester derivatives, chitin acylates (ester derivatives) are rarely used in application practically, despite being recognized as one of the most abundant polysaccharides, because only several reaction approaches have been investigated to synthesize variously substituted ester derivatives. molecular strong hydrogen bonds, particularly between the acetamido groups at C-2 position in the β(1→4)-linked Nacetyl-D-glucosamine units.…”

“…For example, mixed cellulose esters having multiple acyl groups, e.g., cellulose acetate butyrate, have an elevated molecular mobility and higher free volume. Thus, the derivative shows a lower viscous flow temperature, and accordingly, better melt processability than CTA, leading to superior thermoplasticity …”

Application of ionic liquids for the functional materialization of chitin

“…119 This attempt was based on the fact that mixed cellulose esters exhibit a lower viscous flow temperature compared to that of single cellulose esters, leading to superior melt processability and thermoplasticity. 120 A stearoyl group was selected as the first substituent, which was combined with different long fatty and bulky acyl groups as the second substituent (Fig. 12b).…”