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A series of hybrid polyimide-SiO2–TiO2 nanocomposites were fabricated from functionalized multi-block polyimides, tetraethyl orthosilicate (TEOS), and titanium isopropoxide (TIP). Polyimides were solution imidized utilizing 4,4′-hexafluoroisopropylidene diphthalic anhydride (6FDA), and stoichiometric amounts of 4,4′-hexafluoroisopropylidene diamine (6FpDA) and 3,5-diaminobenzoic acid (DABA). Organic...
Sulfonated penta-block ionomer (SBI) solvent cast film's ion domain spatial arrangement transitioned from random into well-connected lamellar/hexagonal structures. This micro-phase separated morphology was tunable and associated solution properties transitioning from nonpolar cyclohexane/heptane (CH) to polar tetrahydrofuran (THF). The observed morphology changes were characterized using transmission...
The viscoelastic properties of poly(α-methyl styrene), its hexamer, and their athermal blends at various concentrations are studied. Master curves for the dynamic shear responses, G′ and G″, are successfully constructed for both the pure materials and the blends, indicating the validity of the time–temperature superposition principle for these systems. The temperature dependence of the shift factor...
The calorimetric glass transition temperature, T g , was measured for both linear and cyclic polystyrenes freeze-dried from dilute solutions of 0.10, 0.05, and 0.02% of polymer by weight in benzene. Upon freeze-drying, T g was found to be depressed by 4–15K depending on the sample, solvent concentration, and freezing conditions. Annealing under vacuum at moderate temperatures, from...
Positronium (Ps) formation in a polymer blend system consisting of polar and non-polar components has been investigated. We measured positron lifetime spectra for a series of polymer blends between polyethylene (PE) and ethylene-vinyl acetate (EVA) as functions of temperature (T=100–300K) and composition (EVA weight content Φ=0–100%) as well as measurement time (t=0–100h) at T=100 and 250K. The glass...
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