Abstract
This paper presents an experimental study on the freeze drying process for poly <TEX>${\gamma}$</TEX> glutamic acid. The physical properties of poly <TEX>${\gamma}$</TEX> glutamic acid are measured during the freeze-drying process. The moisture contents of poly <TEX>${\gamma}$</TEX> glutamic acid according to the glass transient temperature are obtained by DSC (Differential Scanning Calorimetry) analysis. The end point of primary drying for the poly <TEX>${\gamma}$</TEX> glutamic acid with a thickness of 3 mm is obtained by measuring the thickness of the dried layer, the amount of moisture evaporation, the moisture content, and the pressure in the drying vacuum chamber during the freeze-drying process. By considering the variation in the glass transient temperature with respect to the moisture content of the material, a control schedule for the heating plate temperature is suggested during the secondary drying process.
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