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A new method is presented to determine the phase diagram of mixed aqueous biopolymer systems using Fourier transform infrared spectroscopy coupled with partial least-squares analysis. We present the equilibrium phase diagrams of aqueous amylopectin/gelatin mixtures allowed to phase separate at a temperature outside the range within which either polymer could gel. The method is capable of detecting the changes in the phase diagram when the molecular weight of one of the components is altered. The phase diagrams are analyzed in terms of the Flory-Huggins theory for ternary systems. The method we have developed can be extended to any other combination of polymers in solution which show sufficient spectral difference.

Raman and infrared spectra of solid benzyl alcohol and two partially deuterated homologues are reported for the first time. The internal vibrational modes and lattice modes of benzyl alcohol are assigned on the basis of isotopic wavenumber shifts. The spectra of solid benzyl alcohol at low temperatures are shown to be consistent with an ordered noncentrosymmetric structure, with at least four molecules in the unit cell.

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