PET/Bio-Based Terpolyester Blends with High Dimensional Thermal Stability

Abstract

To improve the dimensional thermal stability of polyethylene terephthalate (PET), a poly(ethylene glycol 1,4-cyclohexane dimethylene (CHDM) isosorbide (ISB) terephthalate) (PEICT) known as ECOZEN®T110 (EZT) was introduced into PET using a melt blending technique. The miscibility, morphology, and thermal properties of the PET/EZT samples were investigated. The introduction of amorphous EZT into semi-crystalline PET increased the glass transition temperature (Tg) but decreased the crystallinity, which could be related to the transesterification reaction. By adding EZT contents up to 20%, the PET/EZT samples showed a single Tg, which indicated the miscibility between PET and EZT. However, two Tg values were observed in the PET/EZT samples with higher EZT contents (30–70%), indicating partial miscibility. This may have been due to the slightly different rheological and thermodynamic parameters that were affected by a higher ratio of bulky (rigid ISB and ductile CHDM) groups in EZT. However, the heat distortion temperature of the PET/EZT samples remarkably increased, which indicated that the dimensional stability was truly enhanced. Although the crystallinity of the PET/EZT samples decreased with increasing EZT content, the tensile strength and Young’s modulus decreased slightly. Based on these results, the as-prepared PET/EZT samples with high dimensional stability can be used as a high-temperature polymeric material in various applications.

Thermochromic and temperature regulation properties of phase change materials derived from polymer composites loaded with VO2 particles

“…Firstly, PET is a rigid semicrystalline polymer with the glass transition temperature ( T g ) and melting temperature ( T m ) of 79.2°C and 255°C, respectively (see Table 1). Besides, the heat distortion temperature (HDT) of PET is around 71–75°C, 40 which is close to the actual temperature in front of the window sheets. This means that it was possible that some of the PET composite specimens were deformed during the exposure to IR radiation.…”

“…Besides, the heat distortion temperature (HDT) of PET is around 71-75 C, 40 which is close to the actual temperature in front of the window sheets. This means that it was possible that some of the PET composite specimens were deformed during the exposure to IR radiation.…”

Long-Term Insect Repellent Electrospun Microfibers from Recycled Poly(ethylene terephthalate)

“…Fibers from solutions containing rPET with 0 wt % repellent, 50 wt % DEET, 50 wt % picaridin, and 54 wt % DEET/picaridin were evaluated using ATR-FTIR (Figure ). The characteristic bands of PET occurred in all fibers at 2978 and 2852 cm –1 (C–H stretching), 1715 cm –1 (CO stretching of carboxylic ester group), 1581, 1506, and 1409 cm –1 (CC aromatic stretching), 1453 and 870 cm –1 (CH 2 bending and rocking), sharp peaks at 1238 and 1090 cm –1 (C–C–O stretching of ester group), sharp peaks at 1015 and 723 cm –1 (in-plane C–H stretching and out-of-plane C–H bending of aromatic ring) . In the insect repellent-loaded fibers, peaks corresponding to repellents were observed and confirmed incorporation of IRs; however, most peaks associated with the repellents overlap with rPET peaks due to the structural similarities.…”

Study on Flexural Behavior of Glass Fiber Reinforced Plastic Sandwich Composites Using Liquid Thermoplastic Resin

“…Thus, the fracture occurred early in the composites and offered lower flexural strength. The retained brittleness in the PET is the cause of cleavage fracture during the bending process [ 53 , 54 ]. The mechanism of action of the sandwich material is to transfer shear forces from the skin layer to the inner layer so that both skin layers remain stable under static and dynamic loads and absorb shock energy in order to provide resistance to damage.…”