The Raman and IR spectra of lactic acid and sodium lactate in aqueous solution and methyl lactate as a pure liquid were recorded from 3600 to 100 cm-'. Vibrational assignments are proposed for the three compounds. The effects of hydrogen bonding on the 6 0 H vibrations of the hydroxyl alcohol group were studied and the results suggest both inter-and intra-molecular hydrogen-bonded association.
The Raman and IR spectra of poly(L-lactic acid) in the amorphous and semicrystalline states were recorded from 3600 to 100 cm-'. Complete vibrational assignments are proposed. In the Raman spectra, the splittings of the vC=O stretching and the SCCO bend are characteristic of the crystalline phase and the presence of the two lines at 923 and 520 cm-' indicates a 10, helical conformation.
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