Raman Scattering and Band Assignments in Polytetrafluoroethylene

Abstract

The laser‐excited Raman spectrum of polytetrafluoroethylene (PTFE) is reported. A new band, an $E_1$ mode at 198 cm⁻¹, is observed. Additional bands, which are apparently $E_2$ modes, are observed at 308 and 676 cm⁻¹ at a sample temperature of − 50°C and at 389 and 741 cm⁻¹ at a sample temperature of − 130°C that are not observed in samples at room temperature. Bands at 575 and 595 cm⁻¹ are found to change in intensity as a function of temperature. Band assignments in PTFE are discussed utilizing the Raman spectra of n‐C₅F₁₂, n‐C₆F₁₄, C₁₄F₃₀, and C₁₈F₃₈, which are reported here for the first time.