Deformation behavior of crosslinked polyurea elastomers obtained via sol-gel chemistry: experimental determination and constitutive modelling

The mechanical behavior of three crosslinked polyurea (PU) elastomers obtained by sol-gel chemistry under uniaxial monotonic and cyclic tests has been assessed. These elastic networks are composed of hard and soft domains, where the segmental molecular weight between crosslinking points differs amon...

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Bibliographic Details
Published in:Express polymer letters 2020-07, Vol.14 (7), p.663-672
Main Authors: Rull, N., Sanchez-Ferrer, A., Frontini, P. M.
Format: Article
Language:English
Subjects:
Chemistry
constitutive modeling
Constitutive models
Crosslinking
Cyclic testing
Elastomers
Hydrogen bonds
Hysteresis
Mathematical models
Mechanical properties
Molecular weight
Polymer melts
Polymerization
polyurea elastomer
Softening
Sol-gel processes
Strain
Stress-strain curves
Stress-strain relationships
Tension tests
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Summary:The mechanical behavior of three crosslinked polyurea (PU) elastomers obtained by sol-gel chemistry under uniaxial monotonic and cyclic tests has been assessed. These elastic networks are composed of hard and soft domains, where the segmental molecular weight between crosslinking points differs among the samples and allow studying the effect of this parameter on the mechanical properties. In this paper, uniaxial tension tests were performed in order to capture the main characteristics of the stress-strain behavior of these PU elastomers, e.g., non-linear hyperelastic behavior, hysteresis, and softening. In addition, a constitutive model that properly represents their behavior was proposed showing that the non-linear stress-strain behavior at large strain values exhibits strong hysteresis and softening.
ISSN:1788-618X
1788-618X
DOI:10.3144/expresspolymlett.2020.54