15 September 2014
ScienceOpen Research – Section: SOR-MATSCI
Materials Science, Polymer Science, Materials Properties, Materials Characterization, Chemistry, Physics, Raman spectroscopy, Polymer, Teflon, PTFE, Elastic modulus, Mechanical property, Nanorod, Perfluoroalkane
We report vibrational Raman spectra of small extended perfluoro-n-alkanes (CnF2n+2 with n = 6, 8–10, 12–14) isolated in supersonic jet expansions and use wavenumbers of longitudinal acoustic vibrations to extrapolate the elastic modulus of cold, isolated polytetrafluoroethylene filaments. The derived value E = 209(10) GPa defines an upper limit for the elastic modulus of the perfectly crystalline, noninteracting polymer at low temperatures and serves as a benchmark for quantum chemical predictions.