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Conductive Behaviour In Relation To Domain Morphology And Phase Diagram Of Nafion/Poly(Vinylidene Co Triflouoroethylene) Blends, Nadzrinahamin Nazir, Namil Kim, Wilder Iglesias, Antal Jakli, Thein Kyu
Conductive Behaviour In Relation To Domain Morphology And Phase Diagram Of Nafion/Poly(Vinylidene Co Triflouoroethylene) Blends, Nadzrinahamin Nazir, Namil Kim, Wilder Iglesias, Antal Jakli, Thein Kyu
Thein Kyu
Electron and proton conductive properties of Nafion/poly(vinylidene fluroride)-co- trifluoroethylene (PVDF-TrFE) blends were investigated in relation to domain morphology guided by phase diagram using differential scanning calorimetry, polarized optical microscopy, and AC impedance analyzers. A theoretical phase diagram was established by self-consistently solving the combined free energy density of FloryeHuggins theory for liquid-liquid demixing and the phase field theory for crystal solidification. Nafion/PVDF-TrFE blends revealed an hourglass type phase diagram, consisted of single phase crystal (Cr1), liquid þ liquid (L1 þ L2) and crystal þ liquid (Cr1 þ L2) coexistence regions. Guided by the phase diagram, the co-continuous or dispersed droplet …
Phase Equilibira And Photopolymerization Induce Phase Transitions Of Mesogenic Diacrylate Monomer And Low Molecular Mass Liquid Crystal Mixtures, Namil Kim, Thein Kyu
Phase Equilibira And Photopolymerization Induce Phase Transitions Of Mesogenic Diacrylate Monomer And Low Molecular Mass Liquid Crystal Mixtures, Namil Kim, Thein Kyu
Thein Kyu
Experimental phase diagrams of binary mesogenic mixtures of reactive mesogenic diacrylate (RM257) monomer and low molar mass liquid crystals (E7) were determined by means of differential scanning calorimetry and optical microscopy. The combined free energy densities of Flory–Huggins for liquid–liquid demixing, Maier–Saupe for nematic ordering, and phase field free energy for crystal solidification was proposed to describe the phase diagrams of the starting E7/RM257 mixtures. The phase diagram thus constructed is an ideal mixing type, exhibiting a narrow loop of isotropic + nematic (I + N) coexistence region followed by the crystal + nematic (Cr1 + N) region in descending …