Thermal Stability of Bio‐Based Aliphatic‐Semiaromatic Copolyester for Melt‐Spun Fibers with Excellent Mechanical Properties

Abstract

Flexible aliphatic poly(lactic acid) is introduced into polyethylene terephthalate through copolymerization to prepare biodegradable copolyester, which aims to solve the non‐degradability of polyethylene terephthalate (PET) and realize the greening of raw materials. In this work, poly(ethylene terephthalate‐co‐lactic acid) random copolyesters (PETLAs) of lactic acid composition from 10 to 50% is synthesized via one‐pot method. The chemical structure and composition, thermal property, and crystallization property of prepared PETLAs resin are characterized. The results shows that the introduction of LA segment forms random copolyester, and the flexible LA segment results in slight decrease in the glass transition temperatures (Tg), melting point (Tm), and crystallinity (Xc) of the copolyesters. The thermal stability of PETLAs is better, and the initial decomposition temperature of PETLA‐10 can reach 394 °C. The PETLAs resin exhibits good processability, and PETLAs fibers are prepared by melt spinning. The strength of PETLA‐10 fiber can reach 260 MPa after drawing treatment, and the elongation at break can reach 130%. Taking advantage of their features, PETLAs as an innovative bio‐based polymer are expected to achieve ecofriendly applications in the fields of fiber, plastic, and film.

A novel biomedical compatibilizer (polyvinyl alcohol‐allyl polyethylene glycol graft copolymer) for polyvinyl alcohol/polyethylene oxide composite system

“…In addition, the signal peaks at δ5.13–5.27 are ascribed to the c, d, and f protons in the molecular formula 37,38 . It can be seen from Figure 1c that the proton signal peak at δ1.34–1.45, δ3.34, and δ4.47 are assigned to CH 2 , CH, and OH, respectively 39–41 . As illustrated in Figure 1d, the signal peak of the PVA structure still exists, and only the signal peak at δ3.51 remains in APEG, which is the CH 2 proton in the ethylene glycol unit.…”

“…37,38 It can be seen from Figure 1c that the proton signal peak at δ1.34-1.45, δ3.34, and δ4.47 are assigned to CH 2 , CH, and OH, respectively. [39][40][41] As illustrated in Figure 1d, the signal peak of the PVA structure still exists, and only the signal peak at δ3.51 remains in APEG, which is the CH 2 proton in the ethylene glycol unit. The signal peaks of δ3.94-3.96, δ5.13-5.27, and δ5.82-5.93 in APEG disappeared, indicating that the allyl group in APEG disappeared.…”

Preparation and characterization of poly(ethylene terephthalate‐co‐aliphatic amide) copolymer fibers with excellent hygroscopicity and softness

“…The dried chips were introduced into the screw extruder, converted from solid to melt under high temperature, and then the melt was pushed through the pipeline to the spinning assembly by the metering pump; after the filaments were ejected from the spinneret, they were bundled, oiled, and then wound into as‐spun yarns. The as‐spun yarns were passed through heated roller and a winding device to prepare the fully drawn yarns 32,33 . The diagram of fibers preparation is shown in Figure 1.…”

“…The as-spun yarns were passed through heated roller and a winding device to prepare the fully drawn yarns. 32,33 The diagram of fibers preparation is shown in Figure 1.…”

New bio-based polyester with excellent spinning performance: poly(tetrahydrofuran dimethanol-co-ethylene terephthalate)

“…Tapping renewable biological resources to prepare novel platform compounds is an important solution to the current energy crisis. [1][2][3][4] 5-Hydroxymethylfurfural (HMF) is an important platform compound that can be converted to a range of important bio-based materials, including 5-hydroxymethyl-2-furan carboxylic acid (HMFCA), 2,5-furandicarboxylic acid (FDCA), and 2,5-tetrahydrofuran dimethanol (THFDM), among others. Considering its important role as a biomass-derived intermediate, it has been regarded as one of the "highest value-added chemicals from biomass" for more than a decade [5][6][7][8][9][10] Over the past decade of research, due to its similar chemical structure to TPA, FDCA seems to be the most desirable alternative.…”