Abstract
The interactions and partitioning of glycerol in polyvinyl alcohol (PVA), hydroxypropyl methylcellulose (HPMC) and their blends has been studied by means of torsional braid analysis (TBA). Glycerol was shown to be a more efficient plasticizer for PVA than HPMC in agreement with solubility parameter prediction. Kelley-Bueche-type equations were fitted to the experimentalTg data and initial slopes yielded an interaction parameter,Kø, between glycerol and the two polymers. Incorporation of glycerol in PVA/HPMC blends did not alter the incompatibility of the two polymers and plasticized both phases. The compositions of the two plasticized phases were calculated from Kelley-Bueche expressions fitted to the experimental data, enabling determination of the glycerol partition coefficients into the two phases. In blends with 20–60% PVA, glycerol partitioned selectively into the PVA-rich phase whereas in the system with 80% PVA, glycerol partitioned selectively into the HPMC-rich inclusions.
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Sakellariou, P., Hassan, A. & Rowe, R.C. Interactions and partitioning of diluents/plasticizers in hydroxypropyl methylcellulose and polyvinyl alcohol homopolymers and blends. Part II: Glycerol. Colloid Polym Sci 272, 48–56 (1994). https://doi.org/10.1007/BF00653309
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DOI: https://doi.org/10.1007/BF00653309