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- W2091213194 abstract "Water vapor absorption isotherms for amorphous solids with the same chemical composition but differing in molecular weight (i.e., PVP‐90, PVP‐30, and PVP‐12), and for glucose, trehalose, and two molecular weight grades of dextran were obtained at 30 °C and analyzed using the Brunauer–Emmett–Teller (BET) equation to obtain the parameters, Wm and CB. Similar analyses were carried out for the same molecule (e.g., glucose or fructose) at −10 and 40 °C. Within each chemical group, Wm, the apparent BET‐like parameter that is generally referred to as the “monolayer‐limit of absorption”, changed very little. In contrast, CB, a measure of the free energy of absorption, significantly increased with increasing molecular weight or decreasing temperature, leading to a shift from a Type III to a Type II isotherm. The shift in isotherm shape correlates directly with the glass transition temperature, Tg, of the dry sample relative to the operating temperature, T (i.e., Type III when T > Tg and Type II when T < Tg. These results are shown to be consistent with the combined Flory–Huggins solution model and Vrentas structural relaxation model; wherein Type II isotherm behavior, observed for T < Tg, reflects nonideal volumetric contributions to the overall free energy of absorption due to plasticization by water, as described by Vrentas, whereas Type III behavior only reflects the Flory–Huggins solution model. These volumetric free energy changes within each chemical group are shown to be correlated to the values of the “BET” parameter CB. ©2000 Wiley‐Liss, Inc. and the American Pharmaceutical Association J Pharm Sci 89: 1063–1072, 2000" @default.
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- W2091213194 date "2000-08-01" @default.
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- W2091213194 title "The Relationship Between “BET” and “Free Volume”‐Derived Parameters for Water Vapor Absorption into Amorphous Solids" @default.
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- W2091213194 doi "https://doi.org/10.1002/1520-6017(200008)89:8<1063::aid-jps11>3.0.co;2-0" @default.
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