Abstract
Poly(butylene terephthalate-co-tetramethylene ether glycol) (PBT-co-PTMEG) copolymers with PTMEG ranging from 0 to 40 wt% were synthesized through melt polymerization. The structure and composition were supported by Fourier-transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (1H NMR). All samples had excellent thermal stability at a Td−5% around 370 °C. Crystallization temperature (Tc) and enthalpy of crystallization (ΔHc) were detected by differential scanning calorimetry (DSC), revealing a decrement from 182.3 to 135.1 °C and 47.0 to 22.1 J g−1, respectively, with the increase in PTMEG concentration from 0 to 40 wt%. Moreover, nonisothermal crystallization was carried out to explore the crystallization behavior of copolymers; the crystallization rate of PBT reduced gradually when PTMEG content increased. Hence, a decrement in the spherulite growth rate was detected in polarizing light microscope (PLM) observation, observing that the PTMEG could enhance the hindrance in the molecular chain to lower the crystallinity of PBT-co-PTMEG copolyester. Moreover, thermal properties and the crystallization rate of PBT-co-PTMEG copolymers can be amended via the regulation of PTMEG contents.
Highlights
Thermoplastic poly(ether ester) elastomer (TPEE) [1], as a member of thermoplastic elastomers (TPE), is widely used in the market [2,3,4,5,6]
Thermal properties and the crystallization rate of Poly(butylene terephthalate) (PBT)-co-PTMEG copolymers can be amended via the regulation of PTMEG contents
1954, and TPEE was described to be a block copolymer consisting of two separated phases: Crystalline aromatic polyester as a hard segment [8,9,10,11,12,13,14,15] and amorphous polyether as a soft segment [16,17,18]
Summary
Thermoplastic poly(ether ester) elastomer (TPEE) [1], as a member of thermoplastic elastomers (TPE), is widely used in the market [2,3,4,5,6]. 1954, and TPEE was described to be a block copolymer consisting of two separated phases: Crystalline aromatic polyester as a hard segment [8,9,10,11,12,13,14,15] and amorphous polyether as a soft segment [16,17,18]. Poly(butylene terephthalate) (PBT) [25,26,27,28,29,30], which possesses excellent mechanical properties, thermal stability, thermal processability, and prominent crystallization ability, is seen as one of the most considerable hard segment materials. The spherulite morphology and crystal growth rate were inspected by polarized light microscopy (PLM)
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