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Structure and physical properties in crosslinked polyurethanes
Author(s) -
Waterlot Véronique,
Couturier Daniel,
Waterlot Christophe
Publication year - 2010
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.32874
Subject(s) - crystallinity , differential scanning calorimetry , polyurethane , materials science , polypropylene , polymer , polypropylene glycol , polymer chemistry , toluene diisocyanate , phase (matter) , propane , chemical engineering , composite material , chemistry , organic chemistry , polyethylene glycol , physics , engineering , thermodynamics
Abstract Crosslinked polyurethanes based on a mixture of toluene diisocyanate, polypropylene glycol, trimethylol propane (TMP), glycerol (GLY), and desmophen (DES) were synthesized with various ratios of DES and GLY. Chemical crosslinks were introduced through the hard segment (TMP, GLY) and through the soft segment (DES). The effects of the degree of crosslinking on the properties were examined. The crystallinity of the obtained polymers were studied by using modulated differential scanning calorimetry, differential scanning calorimetry, dynamic mechanical analysis and their morphology was studied by atomic force microscopy. It appeared that the degree of crosslinking increased according to the increase of GLY content. Moreover, it was found that chemical crosslinks in the hard segment destroyed the crystallinity of the hard phase and reduced the mobility of the soft phase, improving the heat stability of the hard domains, and modifying the mechanical properties of polyurethane films. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011