The content of the beta-crystal form in the crystalline region depended on the PVDF/PMMA composite ratios and the type of solvents used for the extraction of the PMMA component, e.g., chloroform and toluene. Thus, the content of the beta-crystal form can be controlled by selecting the original

PVDF/PMMA composition and the solvent used to extract the PMMA component. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 1868-1872, 2009″
“An analysis of the hydrodynamic motion of the fluid of photoinjected carriers in polar semiconductors is presented. eFT-508 Experiments of time-resolved photoluminescence, which provide relevant insights into the dynamical behavior of heterostructures, are analyzed. We study the propagation and recombination of carriers in semiconductor devices with a large cap layer, where carriers are photoinjected, and a quantum well where they recombine. The movement of the photoinjected, and away from equilibrium, carriers along such cap layer consists, to a good degree of approximation,

in an ambipolar diffusivelike one, which decays in GKT137831 mw time as a result of recombination and the coupling, via Coulomb interaction, with the optical and acoustic plasma waves. The density of the electrons arriving at the interface with the quantum well can be determined; these electrons are transferred through the interface to recombine in the quantum well, and the resulting intensity of the time-resolved luminescence is obtained. Comparison

with experimental data shows a good agreement. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3173176]“
“In this work, the enzyme-catalyzed degradation of hyperbranched polyesters (HBPEs) was investigated. Enzymatic degradation experiments were performed in a phosphate buffer in the presence of the lipases Candida cylindracea, Pseudomonas cepacia, Novozym 388, Amano CE, Lipomod 34P, and Cal-B, whereas control experiments were performed selleck inhibitor in the same system without lipases. The extent of polymer degradation was determined by quantification of the released free fatty acids by gas chromatography. The influence of the alkane chain length and the number of alkane chain end groups on the lipase-catalyzed hydrolysis of esterified HBPEs was investigated systematically. It was found that the increase in file alkane chain length of the end groups diminished the enzymatic degradation of the polymer, whereas the number of end groups had no influence oil the degradation rate. The effect of temperature oil the rate of degradation was also described. Surface morphological changes that occurred during the degradation were assessed with reflected electron microscopy.