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Dynamics Of Spherulitic Growth In Blends Of Polypropylene Isomers, Rujul Mehta, Thein Kyu
Dynamics Of Spherulitic Growth In Blends Of Polypropylene Isomers, Rujul Mehta, Thein Kyu
Thein Kyu
The spatiotemporal growth of spherulites in blends of isotactic polypropylene (iPP) and atactic polypropylene (aPP) isomers has been investigated theoretically with the time-dependent Ginzburg–Landau equation, which consists of a nonconserved crystal order parameter and a conserved compositional order parameter. In the description of the total free energy, a local free energy density in the form of an asymmetrical double well, signifying the metastability and latent heat of crystallization, is combined with a nonlocal free energy term representing the interface gradient. In addition, the Flory–Huggins free energy for mixing between iPP and aPP isomers has been employed to account for blend …
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 …