Quasi-Static Tensile Deformation Measurements of Select Model Poly(urethane urea) (PUU) Elastomers

Report No. ARL-TR-6806
Authors: Alex J. Hsieh; Paul Moy
Date/Pages: February 2014; 20 pages
Abstract: The molecular influence on quasi-static mechanical properties of select model 4,4-dicyclohexylmethane diisocyanate-diethyltoluenediamine-poly(tetramethylene oxide)-based poly(urethane 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 poly(tetramethylene 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 poly(tetramethylene 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.
Distribution: Approved for public release
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Last Update / Reviewed: February 1, 2014