Quasi Static Tensile Deformation Measurements of Select Model Poly(urethane urea) (PUU) Elastomers
Technical Report,08 Jun 2013,08 Jun 2013
U.S. Army Research Laboratory Aberdeen Proving Ground United States
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The molecular influence on quasi-static mechanical properties of select model 4,4-dicyclohexylmethane diisocyanatediethyltoluenediamine-polytetramethylene oxide-based polyurethane urea PUU elastomers is investigated. Increasing the hard segment HS content gives rise to PUUs with higher stiffness, higher flow stress, as well as greater strain hardening upon tensile deformation. Furthermore, PUUs with similar HS contents but varying in the molecular weight MW of polytetramethylene oxide reveal a significant difference in the mechanical deformation response, particularly the ultimate tensile strength, in addition to earlier reported observations that dynamic strain-rate sensitivity of these PUUs was strongly dependent upon the MW of polytetramethylene oxide. These results highlight that a proper choice of PUUs with optimized tensile strength in addition to the desired dynamic strain-rate hardening characteristics is required for use in the design of a multilayer matrix composite.
- Elastomers and Rubber