Facile and Large-scale Fabrication of Biodegradable Thermochromic Fibers Based on Poly(lactic acid)

Facile Fabrication of Photochromic Poly(lactic acid)/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Fibers via a Scalable Melt-Spinning Process

“…The tenacity of photochromic fibers tends to decrease from 4.30 to 3.57 cN/dtex as the PHBV content increases from 0 to 20 wt %. Even so, the tenacity and elongation at break of the fPLA80/PHBV20 sample could still meet the performance requirements of subsequent processing and weaving . As reported by previous studies, the tenacity of the fibers containing PHBV would not be improved unless the highly extended β-form crystal was formed under certain conditions.…”

“…However, it should be noted that the addition of functional particles to PLA fibers observably increases the modulus of the fibers. Chen et al 17 found that the initial modulus of thermochromic PLA fibers increased from 49 to 54 cN/dtex after the addition of functional particles. In fact, a rise in the initial modulus of the fibers will result in less flexibility and a stiffer hand feel to the fabric, affecting the comfort of the product.…”

“…15 To date, several functional PLA fibers have been developed, and they exhibit good mechanical tenacity and processability, providing a reference basis for the coordination of the mechanical performance and discoloration function of photochromic PLA fibers. For example, Zhang et al 16 prepared fluorescent PLA fibers with a breaking strength of 2.2−2.9 cN/ dtex, and Chen et al 17 prepared thermochromic PLA fibers with a breaking strength of 3.75−4.78 cN/dtex. However, it should be noted that the addition of functional particles to PLA fibers observably increases the modulus of the fibers.…”

Regulation of polylactic acid using irradiation and preparation of PLA–SiO2–ZnO melt-blown nonwovens for antibacterial and air filtration

“…According to GB/T 20944.2 Textiles -Evaluation for Mntibacterial Mctivity-Part 2: Absorption Method, SCDLP liquid culture medium was added to the test bacteria solution, the bottle cap was closed tightly, and the bacteria were eluted by shaking 5 times (5 s each time) at 37 °C for 18 h. The eluted 10-fold diluted solution is injected into a plate, and then about 15 mL of counting medium at 45 °C is added. Aer sealing, the plate is placed at room temperature, and aer the medium solidies, the plate is inverted and cultured at 37 °C for 18 h. According to the number of colonies (CFU) on the plate, use formula (5) to calculate the antibacterial rate:…”

“…3 As a bio-based biodegradable polymer, polylactic acid (PLA) comes from renewable resources such as straw and starch in crops and is easy to recycle or decompose, having an advantage in disposable protective equipment. 4,5 However, PLA faces many problems in melt-blown spinning progress, e.g. poor spinnability, which signicantly affects the ltration performance and mechanical properties of MBs.…”