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Thermoplastic Polyurethanes with Poly(butylene terephthalate) as Crystallizable Hard Phase
Author(s) -
De Debasish,
Gaymans Reinoud J.
Publication year - 2008
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200700356
Subject(s) - materials science , dynamic mechanical analysis , composite material , compression set , melting point , thermoplastic , modulus , ribbon , phase (matter) , glass transition , morphology (biology) , oxide , polymer , organic chemistry , natural rubber , chemistry , metallurgy , biology , genetics
Polyurethanes were prepared from poly(tetramethylene oxide) end‐capped with MDI and PBT extenders. The PBT extenders were random‐disperse in length and their length varied from three to seven repeating units. The structure of the polyurethanes was studied by FT‐IR and AFM, their thermal and thermomechanical responses were measured by DSC and DMTA, and their elastic behavior was assessed by compression set measurements. The MDI‐PBT‐MDI hard segments had a ribbon‐like crystalline morphology. Increasing the PBT length gave rise to an increase of the storage modulus at room temperature and the melting point. The storage modulus depended strongly on temperature.