Robert D. Collier
Dept. of Mech. Eng., Tufts Univ., Medford, MA 02115
S2WG79 candidate materials for standardization have been measured in accordance with procedures recommended by the Working Group. The measurements have been performed with the Tufts viscoanalyzer with a frequency range up to 1 kHz. Results for the candidate materials include complex Young's modulus, shear elastic modulus, and associated loss factors as a function of frequency and temperature. Multi-sample testing provides statistical measures of measurement errors and sample variations. Results are presented in formats for ready comparison with those of other investigators. In addition, results of research on cured epoxy resins and selected dental composites illustrate relationships between measured glass transition temperatures and composite material compositions.