Low temperature dynamics of glycolic and lactic
acid studied by Raman spectroscopy
V. Mohaček Grošev1 and V. Šoštarić
1Ruđer
Bošković Institute, Zagreb, Croatia
E-mail: [email protected]
D,L-glycolic and L-(+) lactic acid are among most used precursors for biocompatible
polymeric materials today. Poly(D,L-glycolic) acid and poly(L-(+)-lactic) acid are
biodegradable materials which US Food and Drug Administration agency approved
of for use as medical sutures, coatings on implants, surgical devices etc. Also, these
polymers are used in packaging, cosmetic and food industry, to name just a few.
Polycrystalline substances were studied by low temperature Raman spectroscopy
in the 10 K – 300 K interval, using T64000 Horiba Jobin Yvon Raman spectrometer
operating in the triple subtractive mode, with 514.5 nm argon green laser line as an
excitation source. CCS 350 Janis Research cryostat was used for cooling the
samples and special attention was given to low frequency spectra. Variation of
phonon bands of both compounds regularly follows contraction of the lattice, and no
band splittings or soft modes were observed (see Figs 1 and 2). Both compounds are
very temperature stable.
Figure1.
Figure 2.
References
[1] G. Cassanas, G. Kister, E. Fabrègue,, M. Morssli, L. Bardet, Spectrochim Acta
49A,271, (1993).