Influence of Myrrh Extracts on the Properties of PLA Films and Melt-Spun Multifilament Yarns

Effect of Low Temperature Reactive Dye Reactive Red 2 on Dyeing and Tensile Properties of Twisted Bamboo Fibers

This study employed bamboo as the raw material and employed the sodium chlorite method to remove most of the chromogenic groups in bamboo. The low-temperature reactive dyes were then utilized as the dyeing agents in combination with the one-bath method to dye the decolorized bamboo bundles. The dyed bamboo bundles were subsequently twisted into bamboo fiber bundles with high flexibility. The effects of various factors, including dye concentration, dyeing promoter concentration, and fixing agent concentration, on the dyeing properties, mechanical properties, and other properties of the twisted bamboo bundles were investigated using a tensile test, dyeing rate test, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. The results indicate that the macroscopic bamboo fibers prepared by the top-down method have excellent dyeability. The dyeing treatment not only improves the aesthetics of bamboo fibers but also improves their mechanical properties to a certain extent. When the concentration of dye is 1.0% (o.w.f.), the concentration of dye promoter is 30 g/L, and the concentration of color fixing agent is 10 g/L, the comprehensive mechanical properties of the dyed bamboo fiber bundles are the best. At this time, the tensile strength is 95.1 MPa, 2.45 times that of undyed bamboo fiber bundles. XPS analysis results show that the relative content of C-O-C in the fiber is significantly increased compared with that before dyeing, which indicates that the formed dye fiber covalent bond can strengthen the cross-linking between fibers, thus improving its tensile performance. The covalent bond is stable, and the dyed fiber bundle can retain its mechanical strength even after high temperature soaping.

Formation and Investigation of Mechanical, Thermal, Optical and Wetting Properties of Melt-Spun Multifilament Poly(lactic acid) Yarns with Added Rosins

One method for adding enhancing properties to textile materials is the insertion of natural ingredients into the textile products during the manufacturing or finishing process. The aim of this research is to investigate the formation of biodegradable melt-spun multifilament Poly(lactic acid) (PLA) yarns with different contents (i.e., 5%, 10%, and 15%) of natural material–rosin, also known as colophony. In this study, multifilament yarns were successfully formed from PLA and a natural substance–pine rosin by melt-spinning them at two different draw ratios (i.e., 1.75 and 2.75). The results indicated that a 1.75 draw ratio caused the formation of PLA and PLA/rosin yarns that were brittle. The presence of rosin (i.e., 5% and 10%) in multifilament yarns decreased the mechanical properties of the PLA/rosin melt-spun multifilament yarns’ tenacity (cN/tex), breaking tenacity (cN/tex), and tensile strain (%) and elongation at break (%) and increased absorbance in the entire UV region spectra. In addition, the melting point and degree of crystallinity decreased and there was an increase in the wetting angle compared with pure PLA multifilament. The investigation of melt-spun yarns with Raman spectroscopy proved the presence of rosin in PLA melt-spun yarns.