Abstract
The growing ecological awareness of society created the tendency to replace petrochemically based materials with alternative energy carriers and renewable raw materials. One of the most requested groups of polymer materials with significant technological importance is thermoplastic elastomers (TPE). They combine the properties of elastomers such as flexibility with the typical properties of thermoplastics, like easy processing. Herein, one compares the influence of rigid segments on the properties of copoly(ester-ether). Thermoplastic polyesters based on bio-1,6-hexanediol and terephthalic (T), furanic (F), and napthalate (N) diesters, i.e., PHT, PHF, and PHN, were obtained employing melt polycondensation. Additionally, to grant elastic properties of polyesters, systems containing 50 wt.% of bio-based polyTHF®1000 (pTHF) with a molecular mass of 1000 g/mol, have been prepared. The composition and chemical structure have been determined by 1H nuclear magnetic resonance (NMR) and Fourier transformed infrared spectroscopy (FTIR) analyses. The temperatures corresponding to phase transition changes were characterized by differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA) analyses. The crystalline structure was examined by X-ray diffraction (XRD) analysis. Additionally, the influence of pTHF–rich segment on the tensile properties, water absorption, as well as thermal and thermo-oxidative stability, has been analyzed. It was found that incorporation of soft phase allows creation of thermoplastic elastomers with tensile characteristics comparable to the commercially available ones, by means of elongation at break higher than 500%, low values of tensile modulus, without exhibiting yield point.
Highlights
Introduction published maps and institutional affilThe increasing awareness in the field of ecology within our society has led to the necessity of creating demand for replacing chemical products made from petroleum with renewable raw materials
Polyesters (PHF, Poly(hexamethylene terephthalate) (PHT), Poly(hexamethylene naphthalate) (PHN)) and copoly(ether-ester)s based on these polyesters were synthesized by melt polycondensation which was described in the experimental session
The chemical structure of materials was analyzed by Fourier transformed infrared spectroscopy (FTIR) spectroscopy and 1 H quantitative nuclear magnetic resonance (NMR) and it confirmed that real composition is similar to feed one
Summary
Introduction published maps and institutional affilThe increasing awareness in the field of ecology within our society has led to the necessity of creating demand for replacing chemical products made from petroleum with renewable raw materials. There is a growing interest in materials like poly(tetrahydrofuran) (polyTHF). PolyTHF is a bio-based derivative from 1,4-butanediol [1]. This material possesses characteristic high chain flexibility, and because of that it has a low melting point between −15 ◦ C to 30 ◦ C, which depends on its molecular weight. The bio-based PolyTHF® 1000 produced by BASF has identical properties to a petrochemicalbased product [1]. PolyTHF can be used in the production of spandex fibers or artificial leather [2]. It can be used for the synthesis of thermoplastic polyurethane [1,2]
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