The FTIR-Raman spectra of polydiacetylenes with chiral pendent groups (–(CH2)nOCONHC *H(CH3)Ph; n 2,3,4,6 and 9; nR(S)MBU) were measured for samples as polymerised, cast from solution and precipitated on filter paper. Peaks due to the –CyC– and –CxC– backbone stretching vibrations occur above 1400 cm ⫺1. A series of peaks due to the interaction of backbone and –(CH2)n – vibrations, which reflect the structure of the alkyl chains in the pendent groups, lie between 700 and 1400 cm ⫺1. Comparison with the spectra of the related nbutoxy-carbonylmethylurethane sidegroup polymers (nBCMU) shows that, with the exception of 9R(S)MBU polymers, the alkyl chains of the nR(S)MBU polymers do not adopt a single conformation even in the as-polymerised samples. This is a consequence of the steric hindrance of the bulky chiral unit at the end of the pendent groups.
Посилання на статтю:
FTIR-Raman spectroscopy of polydiacetylenes with chiral pendent groups / David Bloor // Polymer. – 1999. – N 40. – P. 3901–3908.