Abstract
Front Cover: A pneumatic relaxometer allows thermoplastic polyurethane elastomers to expand suddenly. Their morphology is monitored by SAXS. It is seen that the basic domain structure changes in a fraction of a second, whereas the stress relaxes much more slowly. Column heights indicate the scattering power Q. This is reported by Almut Stribeck and co-workers in article number 2000386.
Highlights
Strain steps are applied to elastomers in a pneumatic relaxometer and monitural changes in the material remains tored by small-angle X-ray scattering (SAXS)
The rise time tr of the step is tr > 0, but it must be much smaller than the relaxation time of the monitored response
There are many papers which carry out a real material, one often has to take into account the mechanical stress relaxation experiments and correlate them time dependence of its response
Summary
Strain steps are applied to elastomers in a pneumatic relaxometer and monitural changes in the material remains tored by small-angle X-ray scattering (SAXS). We, try to record and analyze the response of the material’s morphology For this purpose, we monitor the classical stress relaxation experiment using X-ray scattering. The stress relaxation experiment, the matefirst response of all materials is a fast morphology conversion which finishes within tmc =250 ms. Because it has been untraceable, it is characterized by a settling stroke Q(tmc) − Q(0). The second response is a slow morphology adjustment process which complies with logarithmic relaxation It is characterized by a relaxation rate DQ = Q(10 t)/Q(t) − 1. There are many papers which carry out a real material, one often has to take into account the mechanical stress relaxation experiments and correlate them time dependence of its response. The relationship (ε < 0.003) to different strains (Δε between 0.2 and 1.9) and relate the stress relaxation to the morphology relaxation moni-
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