The depressed T(g) in both CO(2)-treated poly(ethylene terephthalate) samples Was roughly inversely

proportional to amount Of CO(2) residues and was independent of the crystallinity of the poly(ethylene terephthalate) sample. The nonreversing curves of TMDSC data clearly indicated that both samples CP-868596 nmr exhibited a big overshoot peak around the glass transition. This overshoot peak occurred at lower temperatures and was smaller in magnitude for samples containing more CO(2) residues. The TMDSC nonreversing curves also indicated that aPET exhibited a clear cold-crystallization exotherm at 120.0 degrees C, but aPET-110-40 exhibited two cold-crystallization exotherms at 109.2 and 127.4 degrees C. The two cold crystallizations in the CO(2)-treated aPET-110-40 became one after vacuum treatment. The DMA data exhibited Multiple tan delta peaks in both CO(2)-treated poly-(ethylene terephthalate) samples. These multiple tan delta peaks, attributed to Multiple amorphous Phases, tended to shift to higher temperatures for longer vacuum times. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 113: 3345-3353, 2009″
“A dramatic

spectral line narrowing of the edge emission at room temperature from tris(quinolinolate) Al (Alq(3)), N,N’-diphenyl-N,N’-bis(1-naphthylphenyl)-1,1′-biphenyl-4,4′-diamine (NPD), 4,4′-bis(2,2′-diphenyl-vinyl)-,1′-biphenyl (DPVBi), and some guest-host small molecular organic light-emitting diodes (OLEDs), fabricated on indium tin oxide (ITO)-coated glass, is described. In all but the DPVBi OLEDs, the Epigenetics Compound Library cost narrowed emission band emerges above a threshold thickness of the emitting layer, and narrows down to

a full width at half maximum of only 5-10 nm The results demonstrate that this narrowed emission is due to irregular waveguide modes that leak from the ITO to the glass substrate at a grazing angle. While measurements of variable stripe length l devices exhibit an apparent learn more weak optical gain 0 <= g <= 1.86 cm(-1). there is no observable threshold current or bias associated with this spectral narrowing. In addition, ill the phosphorescent guest-host OLEDs, there is no decrease in the emission decay time of the narrowed edge emission relative to the broad surface emission. It is suspected that the apparent weak optical gain is due to misalignment of-the axis of the waveguided mode and the axis of the collection lens of the probe. However, it is not clear if such a misalignment can account for all the effects of the observed evolution of the edge-emission spectra with l. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3253582]“
“The free-radical copolymerization of 4-vinyl pyridine (4-VP) with methyl acrylate (MA) initiated by p-acetylbenzylidene triphenylarsonium ylide at 60 +/- 0.1 degrees C with dioxane as an inert solvent yielded random copolymers. The kinetic equation was R(p) proportional to [Ylide](0.83)[4-VP](0.33) [MA](0.