Synthesis and Characterizations of Poly(trimethylene terephthalate)-b-poly(tetramethylene glycol) Copolymers

Abstract

A series of poly(trimethylene terephthalate)-b-poly(tetramethylene glycol) (PTT-PTMEG) copolymers were synthesized by two-step melt-polycondensation. The copolymers were characterized by using Fourier transform infrared spectroscopy (FTIR),1H NMR spectroscopy, rheometer, differential scanning calorimetry (DSC), polarized optical microscopy (POM), thermal gravimetric analysis (TGA), and mechanical properties. The results suggest that by increasing the flexible PTMEG contents from 0% to 60 wt%, the copolymers show decreased glass transition temperatures, melting points, melt-crystallization temperatures, hardness, tensile strength, thermostability, and smaller spherulites dimensions; however it has much increased impact strength and elongation at breaking point. Compared with commercial poly(butylene terephthalate) (PBT)-type TPEE with 25 mol% flexible segments, PTT-type TPEE having 25 mol% flexible segments has a lower glass transition temperature, melting point, crystallization temperature, and much lower tensile strength although it has a much higher impact strength than that of PBT-type TPEE, and it is not suitably used as a commercial TPEE.

Pre- and Post-Failure Experimental Bending Analysis of Glass Elements Coated by Aged Anti-Shatter Safety Films

“…This implies that no chemical degradation (oxidation) took place on PET layers and that no degradation or cross-link reaction occurred in the adhesive during the ageing processes. blends (Liu et al 2013;Piccinini et al 2013;Son et al 2003) and their melting temperature is consistent with this secondary melting peak.…”

Microencapsulated dimethyl terephthalate phase change material for heat transfer fluid performance enhancement

“…The terephthalate units show a 1723-cm À1 peak intensity because of the C¼O stretching vibration (Figure 3). The 1276 and 1110 cm À1 asymmetric and symmetric stretching vibrations are due to C-O-C [35]. The 3010, 2959, 2933 and 2830 cm À1 peaks are due to the -CH 2asymmetric and symmetric stretching vibrations.…”

Effects of thermoplastic poly(ether-ester) elastomer and bentonite on properties of recycled poly(ethylene terephthalate)

“…TPEE used in this study is a commercially available block copolymer with high elasticity, containing short crystallizable hard polyester segments (poly(butylene terephthalate)) and long amorphous soft/flexible polyether segments (polyether glycols). [16][17][18][19][20] The role of TPEE is thus expected to improve both brittleness and notch sensitivity of R-PET. The hard phase having high glass transition temperature (T g ), offers strength and processability of thermoplastic to TPEE, while the soft phase with low T g renders flexibility of high-performance elastomer, and so the TPEE properties depend on the polyester/polyether block ratio.…”

“…The hard phase having high glass transition temperature (T g ), offers strength and processability of thermoplastic to TPEE, while the soft phase with low T g renders flexibility of high-performance elastomer, and so the TPEE properties depend on the polyester/polyether block ratio. 18,20 The random distribution of these blocks combines many attractive properties of both elastomeric and plastic materials, including excellent resiliency, flexibility, impact strength and chemical resistance over a wide temperature range. [17][18][19][20] Based on these advantages, TPEE seems to be a material of choice for modifying or enhancing certain properties of R-PET via melt blending, as a consequence of their similarity in molecular structures and functional groups and possible compatibilty.…”