Lamellar orientation in thin films of symmetric semicrystalline polystyrene-b-poly(ethylene-co-butene) block copolymers: effects of molar mass, temperature of solvent evaporation, and annealing

Article Abstract:

Atomic force microscopy, grazing incidence X-ray diffraction and X-ray photoelectron spectroscopy were used for examining the orientation of the lamellar microdomains in thin films of three symmetric polystyrene-b-poly(ethylene-co-butylene) block copolymers on mica. Findings reveal the dependence of the lamellar orientation in the [S.sub.x][E.sub.y] block copolymers on the molar mass of block copolymers, the temperature of solvent evaporation and annealing.

Paint and Coating Manufacturing, Paints and allied products, Copolymer Coating Systems, Usage, Atomic force microscopy, Properties, Copolymer coatings

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Electrochemical variation of the energy level of poly(3,4-ethylenedioxythiophene): Poly(styrenesulfonate)

Article Abstract:

Doping level of compact PEDT: PSS films can be adjusted by controlling the amount of charge infected during the electrochemical doping/redoping processes using tolusulfonic acid. By further investigation it was found that the OLEDs using electrochemically doped PEDT:PSS/ITO anodes show a significant reduction of operating voltage and improved device performance consistent with an increase of doping level of the polymer.

Styrene, Energy levels (Quantum mechanics)

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Dynamics of photoinduced electron transfer in a molecular donor-acceptor quartet

Article Abstract:

The electronic structures and dynamics of photoinduced charge separation and recombination in a new donor-acceptor quartet molecule with its bis-oligothiphene (BOTH) and bis-perylenediimide (BPDI) blocks attached to a benzene ring were described. Two different dynamics of charge separation and recombination associated with two types of donor-acceptor pair conformations in solution were seen.

Analysis, Electron transport, Electron donor-acceptor complexes

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