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Effects Of Genistein Modification On Miscibility And Hydrogen Bonding Interactions In Poly(Amide)/Poly(Vinyl Pyrrolidone) Blends And Morphology Development During Coagulation, Chandrasekaran Neelakandan, Thein Kyu
Effects Of Genistein Modification On Miscibility And Hydrogen Bonding Interactions In Poly(Amide)/Poly(Vinyl Pyrrolidone) Blends And Morphology Development During Coagulation, Chandrasekaran Neelakandan, Thein Kyu
Thein Kyu
Miscibility characteristics of poly(amide):poly(vinyl pyrrolidone) (PA:PVP) blends containing a soybean-derived phytochemical called “genistein” have been investigated using differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The occurrence of hydrogen bonding in the binary PA/genistein (PA/G) and PVP/genistein (PVP/G) pairs as well as their ternary blends has been confirmed by Fourier transformed infrared spectroscopy (FTIR). On the basis of DSC and POM data, the morphology phase diagram of PA:PVP/G blends is mapped out, which consisted of various coexistence regions such as isotropic, liquid + liquid, liquid + crystal, liquid + liquid + crystal, and solid crystal regions. Subsequently, PA:PVP membranes …
Membrane Morphology And Phase Diagrams Of Mangiferin Modified Poly(Amide)/Poly(Vinyl Pyrrolidone) Blends, Chandrasekaran Neelakandan, Thein Kyu
Membrane Morphology And Phase Diagrams Of Mangiferin Modified Poly(Amide)/Poly(Vinyl Pyrrolidone) Blends, Chandrasekaran Neelakandan, Thein Kyu
Thein Kyu
Mangiferin modified membranes were prepared based on amorphous poly(amide) (PA)/poly(vinyl pyrrolidone) (PVP) blends by coagulation via solvent (dimethyl sulfoxide, DMSO) and non-solvent (water) exchange. To understand miscibility behavior and provide guidance to kinetic pathways of the coagulation process, various ternary phase diagrams of PA/DMSO/water, PA:PVP/DMSO/water, and mangiferin/DMSO/water mixtures were constructed. The ternary phase diagram of PA/DMSO/water mixture is consisted of isotropic liquid and liquid+liquid coexistence regions, whereas the mangiferin/DMSO/water system exhibited a crystal+isotropic coexistence region. Addition of PVP to the PA/DMSO/water solution showed little or no effect on the ternary phase diagram of PA:PVP/DMSO/water, whereas the addition of mangiferin to …