Premium
Tensile deformation behaviour of the polymer phase of flexible polyurethane foams and polyurethane elastomers
Author(s) -
van Der Heide Evert,
van Asselen Otto L.J.,
Ingenbleek Gerwin W. H.,
Putman Constant A. J.
Publication year - 1999
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19991470113
Subject(s) - materials science , polyurethane , composite material , elastomer , deformation (meteorology) , ultimate tensile strength , polymer , phase (matter) , stress (linguistics) , linguistics , chemistry , philosophy , organic chemistry
The change in micromorphology of the polymer phase (single strut) of a flexible polyurethane foam during deformation has been investigated by attenuated total reflection infrared spectroscopy ‐ linear dichroism and by atomic force microscopy. Deformation and, therefore, orientation take place mainly in the soft rubbery phase. This two‐phase elastic deformation process has been translated into a mathematical model, which correctly predicts the shape of a single‐strut stress‐strain curve. The theory also predicts the ultimate shape of stress‐strain curves of polyurethane elastomers at various hard phase contents and of low‐density polyethylene at various temperatures. Deviations from the elastic behaviour could be ascribed to yielding in combination with the rubbery behaviour.