Abstract
Blue polydiacetylene films were prepared from the Langmuir–Schaefer (LS) and Langmuir–Blodgett (LB) films of the cadmium salt of 10,12-pentacosadiynoic acid, CH 3(CH 2) 11 C C C C (CH 2) 8COOH, and the C C stretching modes of the Raman spectra of the LS and LB films were observed at 2068 and 2079 cm −1, respectively. These wavenumbers appeared to be sensitive to the packing of polymer chains. Most of the progression bands observed in the range of 1332–1182 cm −1 have been assigned to the CH 2 wagging modes of the all- trans structure of the (CH 2) 11CH 3 group.
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