Viscoelastic Characterization of Aliphatic Polyurethane Interlayers

Report No. ARL-TR-4296
Authors: Neil MacAloney; Andres Bujanda; Robert Jensen; and Nakhiah Goulbourne
Date/Pages: October 2007; 36 pages
Abstract: The viscoelastic properties of several commercially available aliphatic thermoplastic polyurethanes were characterized. Differential scanning calorimetry showed that for Deerfield 4700, Inter Materials IM 800, IM 800A, IM 1600, and IM 2500, there is a permanent physical change that occurs during heating. Dynamic mechanical analysis and shear rheometry were used to generate elastic and shear modulus master curves in the frequency domain for Inter Materials IM 800 A. The Williams Landel Ferry constants and Prony coefficients were extracted from these master curves. Quasi-static mechanical properties were determined from tensile tests on dog bone samples and compression tests on cylindrical samples. Visual image correlation was used to determine the Poisson's ratio from the mechanical tests by simultaneously capturing longitudinal and lateral strain.
Distribution: Approved for public release
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Last Update / Reviewed: October 1, 2007