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New linear polyurethaneureas based on polyoxytetramethylene, aliphatic diisocyanates, and aromatic diamines
Author(s) -
Knaub P.,
Camberlin Y.
Publication year - 1986
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.1986.070320629
Subject(s) - diamine , glass transition , amorphous solid , steric effects , materials science , polymer chemistry , ultimate tensile strength , phase (matter) , polymer , organic chemistry , chemistry , composite material
New polyurethaneureas have been synthesized with α‐ω hydroxylated polyoxytetramethylene, aliphatic diisocyanates and nonhalogenated aromatic diamines. Four series of PUR have been studied by varying the PTMO molecular weight, the stoichiometry, the nature of the aliphatic diisocyanate, and the steric hindrance of the aromatic diamine. Quantitative evaluation of the degree of phase separation was obtained by DSC. An estimation of the dispersed soft segments outside the soft phase could thus be made. In addition to DSC, dynamic mechanical properties, were obtained for the four series of PUR over a wide temperature range. The hard segments in the PUR chains are amorphous and their high temperature behavior depends only on the strength of interactions in the amorphous state. Finally, stress‐strain measurements were carried out on a few samples, and a wide range of tensile properties has been observed.