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  • 1
    Electronic Resource
    Electronic Resource
    Interactions and partitioning of diluents/plasticizers in hydroxypropyl methylcellulose and polyvinyl alcohol homopolymers and blends. Part I: Diethylene glycol (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 1083-1090 
    Details
    ISSN: 1435-1536
    Keywords: Aqueous solutions ; polyvinyl alcohol ; hydroxypropyl methylcellulose ; interactions ; plasticizer ; partitioning ; solubility ; diethylene glycol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659298
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  • 2
    Electronic Resource
    Electronic Resource
    Interactions and partitioning of diluents/plasticizers in hydroxypropyl methylcellulose and polyvinyl alcohol homopolymers and blends. Part II: Glycerol (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 48-56 
    Details
    ISSN: 1435-1536
    Keywords: Aqueous ; polyvinyl alcohol ; hydroxypropyl methylcellulose ; interactions ; plasticizer ; partitioning ; solubility ; glycerol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653309
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  • 3
    Electronic Resource
    Electronic Resource
    Interactions and partitioning of diluents/plasticizers in hydroxypropyl methylcellulose and polyvinyl alcohol homopolymers and blends. Part III: Polyethylene glycol 400 (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 220-227 
    Details
    ISSN: 1435-1536
    Keywords: Aqueous ; polyvinyl alcohol ; hydroxypropyl methylcellulose ; interactions ; plasticizer ; partitioning ; solubility ; polyethylene glycol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The interactions and partitioning of polyethylene glycol 400 (PEG400) in hydroxypropyl methylcellulose (HPMC), polyvinyl alcohol (PVA) and their blends have been investigated by means of torsional braid analysis (TBA). PEG400 was shown to be a better plasticizer for HPMC than PVA, in agreement with solubility parameter predictions. Incorporation of PEG400 in blends of PVA and HPMC did not alter the incompatibility between the two homopolymers and plasticized both phases. The PEG400 content in the two phases was calculated by fitting Kelley-Bueche and quadratic expressions to the experimental data, enabling determination of the PEG400 partition coefficient. The data showed a selective partitioning of PEG400 in the HPMC phase for plasticizer contents less than 20% w/w. At higher concentrations, PEG400 continued to partition selectively into the HPMC phase for blends with 60 and 80% PVA but started partitioning in the PVA phase for blends with 20 and 40% PVA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658851
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