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Dynamics and deformation behaviour in non‐hydrogen bonded model urethanes under heat and stress as studied by dielectric and infrared spectroscopy
Author(s) -
Boese D.,
Eisenbach C. D.,
Fischer E. W.,
Hayen H.,
Nefzger H.,
PlanerKühne G.,
Reynolds N.,
Spiess H. W.
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910500119
Subject(s) - differential scanning calorimetry , materials science , dielectric , deformation (meteorology) , infrared spectroscopy , spectroscopy , polyurethane , dielectric spectroscopy , stress (linguistics) , alkyl , phase transition , molecular dynamics , composite material , polymer chemistry , thermodynamics , chemistry , organic chemistry , computational chemistry , linguistics , physics , philosophy , optoelectronics , electrode , quantum mechanics , electrochemistry
A model polyether‐urethane with monodisperse N‐alkyl polyurethane hard segment has been investigated by differential scanning calorimetry, dielectric spectroscopy and infrared spectroscopy. The temperature dependent changes in the enthalpic and dielectric properties have been correlated with specific molecular motions and transition processes in the hard and soft phase. The orientation of the hard and soft segments under uniaxial stress changes with the strain and mechanisms for the orientation and deformation behaviour have been proposed. Effects of the thermal history of the sample on the properties have been discussed as well.