Abstract
Thermoplastic polyurethane elastomers (TPUs) containing aliphatic polycarbonate soft segments and hard segments formed by 1,1′-methanediylbis(4-isocyanatocyclohexane) or 1,6-diisocyanatohexane and a combination of two chain extenders, i.e., 2,2′-[sulfanediylbis(benzene-1,4-diyloxy)]diethanol and 3-hydroxy-2-(hydroxymethyl)-2-methylpropanoic acid (DMPA), were synthesized in a one-step catalyzed melt polyaddition process. The obtained colorless, transparent and high-molar-mass materials, which differ in the content of the soft segments (30 or 45 mol%) and DMPA (10 or 20 mol%), were subjected to a series of test. Their structure was examined by FTIR spectroscopy, and the thermal properties were studied using differential scanning calorimetry and thermogravimetry. Moreover, their Shore A/D hardness, tensile, adhesive and optical properties were determined.These modified by an ionic chain extender TPUs were characterized by generally enhanced transmittance (up to 92.7% at 800 nm), tensile strength (up to 49.3 MPa), hardness and adhesive strength, and decreased elongation at break with a slightly worsened thermal stability in comparison with the non-modified ones.
Highlights
Thermoplastic polyurethane elastomers (TPUs) are segmented copolymers of alternately distributed flexible soft segments and more rigid hard segments, containing urethane
To synthesize conventional TPUs polyester, polyether and polycarbonate diols are utilized as soft segments, while to construct hard segments one uses aliphatic diols (mainly butane-1,4-diol (BD)) and aromatic
They were obtained from non-conventional chain extenders, i.e., 2,2′-[sulfanediylbis(benzene-1,4-diyloxy)]diethanol, 2,2′-[oxybis(benzene-1,4-diylsulfanediyl)]diethanol or 2,2′-[sulfanediylbis(benzene1,4-diylsulfanediyl)]diethanol, commercial diisocyanates, such as MDI, HMDI and 1,6-diisocyanatohexane (HDI), and commercial polymer diols, such as aliphatic polyether diol of Mn = 1000 g∕mol and aliphatic polycarbonate diol of Mn = 2000 g/ mol (PCD)
Summary
Thermoplastic polyurethane elastomers (TPUs) are segmented copolymers of alternately distributed flexible soft segments and more rigid hard segments, containing urethane. I and my colleagues presented TPUs modified in the main chain [15,16,17,18] They were obtained from non-conventional chain extenders, i.e., 2,2′-[sulfanediylbis(benzene-1,4-diyloxy)]diethanol (diol OSOE), 2,2′-[oxybis(benzene-1,4-diylsulfanediyl)]diethanol or 2,2′-[sulfanediylbis(benzene1,4-diylsulfanediyl)]diethanol, commercial diisocyanates, such as MDI, HMDI and 1,6-diisocyanatohexane (HDI), and commercial polymer diols, such as aliphatic polyether diol of Mn = 1000 g∕mol and aliphatic polycarbonate diol of Mn = 2000 g/ mol (PCD). These polymers revealed relatively good thermal stability and tensile strength (up to ~ 44 MPa). Having applied the above-mentioned sulfur-containing chain extenders, we received polymers with both better adhesive properties to metals and improved refractive index and transparency when compared to those created with conventional chain extender [16, 18]
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