Polymer thin films have numerous technical applications as functional coatings, the most prominent example being PMMA coatings for lithography of integrated circuits and micromechanical devices. Polymer blends and block copolymers can be tailored for specific mechanical, optical, electric, and chemical properties. For instance, functional surfaces have been created by means of polymer blend and...

The contact between the polymer active layer and the electrode is one the most critical interfaces in polymer solar cells. In this article, we report the progress of interface engineering in polymer solar cell research, where the multiple functions of the interfacial materials will be discussed. The vertical composition profile in polymer:fullerene blends is an emerging topic, and the interlaye...

beside ziegler-natta and phillips catalysts the development of methylaluminoxane (mao) as cocatalyst incombination with metallocenes or other transition metal complexes for the polymerization of olefins haswidely increased the possibilities in controlling the polymer composition, polymer structure, tacticity and special properties with high precision. these catalysts allow the synthesis of isot...

We present photoluminescence and electroluminescence studies of bilayers and blends formed from poly~vinyl carbazole! ~PVK! and poly~pyridyl vinylene phenylene vinylene! ~PPyVPV! copolymer derivatives. Bilayers of PVK and the PPyVPV copolymers have a photoluminescence emission which cannot be assigned to either the photoluminescence of PVK or the PPyVPV layer. The blends of the two polymers sho...

We study the structure and thermodynamics of the critical nuclei in metastable binary polymer blends using the self-consistent field method. At the mean-field level, our results are valid throughout the entire metastable region and provide a smooth crossover from the classical capillary-theory predictions near the coexistence curve to the density functional predictions of Cahn and Hilliard ~pro...

SUMMARY Roller compacted hydrophilic polymer combinations were used to formulate verapamil hydrochloride (HCl) extended release hydrophilic matrix tablets. The effect of roller compaction (RC) parameters on the properties of blended polymers, tablets and drug release were investigated. RC granulation improved the powder properties without affecting the pharmacotechnical properties or the drug r...

A previous study showed that microporous, compliant and (bio)degradable vascular prostheses prepared from a polyurethane/poly(L-lactic acid) mixture can function as a temporary scaffold for the regeneration of small-calibre arteries. In this study the mechanism of fragmentation of vascular prostheses made of polyurethane, copolyesterether and blends of either polyurethane or copolyesterether wi...

The viscosity behavior of aqueous mixtures formed by a polyelectrolyte (A) and a neutral polymer (B), such as chitosan/poly(vinyl alcohol) (Ch/PVA) and microcrystalline chitosan/poly(vinyl alcohol) (MCCh/PVA), have been investigated at 25 °C. The intrinsic viscosity and the viscosity interaction parameter of each polymer in 0.1 mol·dm-3 CH3COOH/0.2 mol·dm-3 NaCl solution as well as the ternary ...

Poly(ethylene oxide) is demonstrated to be a suitable matrix polymer for the solution-doped conjugated polymer poly(3-hexylthiophene). The polarity of the insulator combined with carefully chosen processing conditions permits the fabrication of tens of micrometer-thick films that feature a fine distribution of the F4TCNQ dopant:semiconductor complex. Changes in electrical conductivity from 0.1 ...