The effect of temperature on the low-frequency Raman scattering from pentadecaethylene glycol di-n-hexyl ether and related materials

Abstract

A systematic investigation has been made of the temperature dependence of the Raman spectrum of homogeneous poly(oxyethylene) di-n-alkyl ethers H(CH₂)_n O(CH₂CH₂O)_m(CH₂)_nH. Here details are reported for the sample with n= 6 and m= 15 and with less complete data on samples (n= 8, m= 15) and (n= 4, m= 9). Many vibrational features are observed including longitudinal and transverse acoustical modes. Reduction of temperature from 293 to 77 K reveals three components of the LAM-1 mode.