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Physical properties of crosslinked polyurethane
Author(s) -
Tsai YuMin,
Yu TzyyLung,
Tseng YuHsien
Publication year - 1998
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199812)47:4<445::aid-pi82>3.0.co;2-b
Subject(s) - polyurethane , differential scanning calorimetry , polyester , triol , isocyanate , materials science , fourier transform infrared spectroscopy , adipic acid , polymer chemistry , ultimate tensile strength , dynamic mechanical analysis , diol , hydroxyl value , chemical engineering , polyol , composite material , polymer , physics , engineering , thermodynamics
Abstract Polyester based polyurethanes were synthesized from low molecularweight polyester ( M n 2000) and4,4′‐methylene bis(phenyl isocyanate)(MDI) with butanediol as a chain extender and glycerol as acrosslinker. The polyester was synthesized from adipic acid and glycolwhich was a mixture of 1,6‐hexanediol and1,2‐propanediol. The effect of the crosslinker content on thedegree of H‐bond formation in the hard segments and thephysical properties of polyurethanes were studied by differentialscanning calorimetry (DSC), thermal mechanical analysis(TMA), Fourier transform infrared spectroscopy(FTIR) and mechanical testing. The experimental resultsrevealed that incorporation of a triol crosslinker into the hardsegments of polyurethane results in a decrease of hard segmentH‐bond formation. The mechanical data indicate that themechanical properties of polyurethanes depend on the concentrations ofphysical and chemical crosslinks and that there is an optimumconcentration of triol crosslinker for the tensile stress andelongation properties. © 1998 Society of ChemicalIndustry