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Influence of urethane group on properties of crosslinked polyurethane elastomers
Author(s) -
Ciobanu Constantin,
Han Xiaozu,
Cascaval Constantin N.,
Guo Fengchun,
Rosu Dan,
Ignat Leonard,
Moroi Gabriela
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.11509
Subject(s) - copolymer , adipate , materials science , polyurethane , differential scanning calorimetry , polymer , elastomer , polymer chemistry , polybutadiene , acrylonitrile , thermoplastic elastomer , crystallinity , isophorone diisocyanate , composite material , chemical engineering , physics , engineering , thermodynamics
Three series of weakly crosslinked polyurethanes based on a hydroxyterminated polybutadiene, hydroxyterminated butadiene–acrylonitrile copolymer, and hydroxyterminated ethylene–adipate–maleate–fumarate copolymer were prepared while varying the hard segment content between 1.72 and 2.36 mol NHCOO/1000 g polymer. Information on the microphase structure and the properties of the synthesized polyurethanes was obtained by differential scanning calorimetry, wide‐angle X‐ray scattering, and mechanical studies. Up to a urethane concentration of around 2 mol NHCOO/1000 g polymer, there is a mixture of hard–hard and hard–soft segments. Above this concentration a large part of the hard–soft segments passes into hard–hard crystallites, liberating the soft segments. The best mechanical properties of the studied polyurethanes were found for a urethane concentration of around 2 mol NHCOO/1000 g polymer. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1858–1867, 2003
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