Abstract
The interactions and partitioning of diethylene glycol (DEG) in polyvinyl alcohol (PVA), hydroxypropyl methylcellulose (HPMC) and their blends has been studied. DEG acted as efficient plasticizer for both homopolymers, lowering theirT g and relative rigidity. Kelly-Bueche-type equations were fitted successfully to the experimental data and yielded an interaction parameter,K Φ, between DEG and each polymer. Incorporation of DEG into two-phase blends of PVA and HPMC with 40, 50 and 60% PVA did not change the significant incompatibility of the two components and plasticized both phases. Composition calculations based on Kelley-Bueche-type expressions fitted to the experimental data afforded determination of the partition coefficients of DEG into the two phases of the blends. In the case of the 50∶50 weight% system, it partitioned almost equally into both phases. The results are discussed in terms of the DEG affinity to interact with the two polymers by means of the dispersive, polar and hydrogen-bonding contribution to the solubility parameters.
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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 I: Diethylene glycol. Colloid Polym Sci 271, 1083–1090 (1993). https://doi.org/10.1007/BF00659298
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DOI: https://doi.org/10.1007/BF00659298