Inorganic oxide core, polymer shell nanocomposite as a high K gate dielectric for flexible electronics applications.

Organic/inorganic core shell nanoparticles have been synthesized using high K TiO(2) as the core nanoparticle, and polystyrene as the shell. This material is easy to process and forms transparent continuous thin films, which exhibit a dielectric constant enhancement of over 3 times that of bulk polystyrene. This new dielectric material has been incorporated into capacitors and thin film transistors (TFTs).

Chain walking: A new strategy to control polymer topology.

Ethylene pressure has been used to control the competition between isomerization (chain walking) and monomer insertion processes for ethylene coordination polymerization catalyzed by a palladium-alpha-diimine catalyst. The topology of the polyethylene varies from linear with moderate branching to "hyperbranched" structures. Although the overall branching number and the distribution of short-chain branching change very slightly, the architecture or topology of the polyethylene changes from linear polyethylene with moderate branches at high ethylene pressures to a hyperbranched polyethylene at low pressures.

Light Scattering Study on the Effect of Polymer Composition on the Structural Properties of PEO-PPO-PEO Micelles.

Micelle structural properties were determined for five poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer solutions at 25°C by using light scattering techniques. Size distributions for the Pluronic series P103, P104, P105, F108, and P123 were found from dynamic light scattering. Aggregation numbers from both dynamic light scattering and static light scattering were determined, and the results are interpreted using fundamental hydrodynamic and statistical thermodynamic models.