TY - JOUR
T1 - Crystallinity of uniform oligo(oxyethylene) mono-alkyl ethers studied by Raman spectroscopy
AU - Craven, John R.
AU - Viras, K.
AU - Masters, Andrew J.
AU - Booth, Colin
PY - 1991
Y1 - 1991
N2 - Low-frequency Raman spectra have been recorded for two series of uniform oligo(oxyethylene) mono-n-alkyl ethers: α-alkyl,ω-hydroxyoligo(oxyethylene)s, H(CH2)n(OCH2CH2)mOH, and α-alkyl,ω-methoxyoligo(oxyethylene)s, H(CH2)n(OCH2CH2)mOCH 3. LAM-1 frequencies were identified and compared with those determined previously for n-alkanes, oligo(oxyethylene) di-n-alkyl ethers and oligo(oxyethylene) dimethyl ethers. On the basis of the linear crystal model of Minoni and Zerbi (J. Phys. Chem., 1982, 86, 4791), non-linear relationships between whole-chain LAM-1 frequency and reciprocal chain length have been explained as effects of end masses and end forces. Prominent bands in the spectra of the α-alkyl,ω-hydroxyoligo(oxyethylene)s were assigned to LAM-1 and LAM-3 of the H-bonded dimer crystallised in a bilayer structure.
AB - Low-frequency Raman spectra have been recorded for two series of uniform oligo(oxyethylene) mono-n-alkyl ethers: α-alkyl,ω-hydroxyoligo(oxyethylene)s, H(CH2)n(OCH2CH2)mOH, and α-alkyl,ω-methoxyoligo(oxyethylene)s, H(CH2)n(OCH2CH2)mOCH 3. LAM-1 frequencies were identified and compared with those determined previously for n-alkanes, oligo(oxyethylene) di-n-alkyl ethers and oligo(oxyethylene) dimethyl ethers. On the basis of the linear crystal model of Minoni and Zerbi (J. Phys. Chem., 1982, 86, 4791), non-linear relationships between whole-chain LAM-1 frequency and reciprocal chain length have been explained as effects of end masses and end forces. Prominent bands in the spectra of the α-alkyl,ω-hydroxyoligo(oxyethylene)s were assigned to LAM-1 and LAM-3 of the H-bonded dimer crystallised in a bilayer structure.
U2 - 10.1039/FT9918703677
DO - 10.1039/FT9918703677
M3 - Article
SN - 0956-5000
VL - 87
SP - 3677
EP - 3682
JO - Journal of the Chemical Society - Faraday Transactions
JF - Journal of the Chemical Society - Faraday Transactions
IS - 22
ER -