Polycarbonate-based thermoplastic polyurethane elastomers modified by DMPA

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 onestep 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.

Synthesis and Characterization of New Polycarbonate-Based Poly(thiourethane-urethane)s

“…The use of chain extenders containing sulfur atoms in their structure is the subject of mine and my colleagues’ research. Of the many systems available, we have synthesized derivatives of diphenylmethane [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ], diphenylethane [ 48 , 49 , 50 , 51 , 52 ], benzophenone [ 53 , 54 , 55 ], diphenyl ether [ 56 ] and diphenyl sulphide [ 38 , 57 , 58 , 59 , 60 ]. In our previous studies, we have attempted to obtain and investigate the effects of such unconventional chain extenders on the structural, thermal, mechanical and optical properties of novel polyurethane materials.…”

Polyurethane: Recent Engineering Contributions

“…In the case of a polyblend of epoxidized natural rubber/TPU it was found that rice husk ash particles had stronger interactions with epoxidized natural rubber and provided enhanced mechanical properties to the rubber [49]. TPU elastomers having aliphatic polycarbonate soft segments and hard segments made by 1,1'-methanediylbis(4isocyanato-cyclohexane) or 1,6-diisocyanatohexane and a combination of two chain extenders were synthesized in one-step catalyzed polyaddition [50].…”

The reinforcing effect of cyclic binary secondary amine chain extenders on the cryogenic performance of thermoplastic polyurethane elastomers

“…The material morphology, mechanical properties, and thermodynamic characteristics of these TPU elastomers were fully characterized and indicated differences in cryogenic performance caused by microphase separation. [19][20][21][22] Combined with molecular structure and interchain interaction, the effect of cyclic amine chain extenders on the microphase separation and subsequent cryogenic performances of these TPUs is discussed in detail.…”

“…The chain extender definitively influences the cryogenic performance of these TPU elastomers, as expected, and gave rise to better low‐temperature resistance and more robust mechanical properties than the control elastomer TPU‐BD using BDO as the chain extender. The material morphology, mechanical properties, and thermodynamic characteristics of these TPU elastomers were fully characterized and indicated differences in cryogenic performance caused by microphase separation 19–22 . Combined with molecular structure and interchain interaction, the effect of cyclic amine chain extenders on the microphase separation and subsequent cryogenic performances of these TPUs is discussed in detail.…”