Poly film structure

Kobashi, M. Takeuchi, H. 1998. Inhomogeneity of spin-coated and cast non-regioregular poly(3-hexylthiophene) films. Structures and electrical and photophysical properties. Macromolecules 31 7273-7278. 

Bhandari, S. Deepa, M. Srivastava, A. K. Joshi, A. G. Kant, R., Poly (3, 4-Ethylene-dioxythiophene)- multiwalled carbon nanotube composite films structure-directed amplified electrochromic response and improved redox activity./. Phys. Chem. B2009,113, 9416-9428. 

Fig. 23 (a) Dependence of the hole mobility in a film of poly-spiro-bifluorene-co-benzothiazole (PSF-BT) as function of the time elapsed after charge carrier generation by a 130 fs laser pulse at different applied voltages. The horizontal lines represent the electron and hole mobilities inferred from ToF experiments, (b) Momentary mobility as a function of the averaged distance that a carrier travelled after a given time. The inset depicts the chemical structure of PSF-BT. From [154] with permission. Copyright (2009) by the American Institute of Physics... 

In all the cases of poly acetylene, polythiophene, and polypyrrole coating, the amount of plasma-film deposition was different, caused by the difference in the structure of the three different monomers and their reactivity during the plasma process. PPy- and PTh-silica are more hydrophobic than PA-silica, probably due to the presence of different chemical moieties in the complex film structure deposited onto the silica surface. 

In the most important series of polymers of this type, the metallotetraphenylporphyrins, a metalloporphyrin ring bears four substituted phenylene groups X, as is shown in 7.19. The metals M in the structure are typically iron, cobalt, or nickel cations, and the substituents on the phenylene groups include -NH2, -NR2, and -OH. These polymers are generally insoluble. Some have been prepared by electro-oxidative polymerizations in the form of electroactive films on electrode surfaces.79 The cobalt-metallated polymer is of particular interest since it is an electrocatalyst for the reduction of dioxygen. Films of poly(trisbipyridine)-metal complexes also have interesting electrochemical properties, in particular electrochromism and electrical conductivity.78 The closely related polymer, poly(2-vinylpyridine), also forms metal complexes, for example with copper(II) chloride.80... 

Poly(ethylene terephthalate) (PET), eg. DuPont Teijin Films Melinex polyester film, and poly(ethylene naphthalate) (PEN), eg. DuPont Teijin Films Teonex polyester film, are biaxially oriented semicrystalline films [1], The chemical structures of PET and PEN are shown in Fig. 7.1. 

Spontak RJ, Samseth J, Bedford SE (1991) Structure in cast films of poly(siloxane-im-ide) copolymers. Eur Polym J 27(2) 109... 

Sasisekharan (1959a) has recently published a more detailed X-ray diffraction study of powders and films of poly-L-proline II, including an analysis of optical diffraction data. This elegant study confirms in all essential details the structure proposed by Cowan and McGavin. 

Structure upon the first irradiation with UV light enhances the effect of the photoisomerization on the refractive index/ (see Figure 6.22). Employing waveguide spectroscopy in thicker LBK films, the refractive indices can be determined. The values for LBK films of poly(L-glutamate) 38 are shown in Figure 6.23. 

In order to demonstrate the importance of the barrier layer for the layer exchange process, an initial glass/Al/a-Si stack without a barrier layer was prepared [50]. To prevent the formation of a barrier layer the a-Si was deposited directly onto the A1 (without vacuum break). The SEM images in Fig. 12.11 make the influence of the barrier layer clear. Two samples are shown - one with barrier layer (by exposure to air for 2 h) (left hand side) and one without barrier layer (right hand side). Both samples were annealed for 45 min at 480° C. After the annealing step, the A1 was etched off chemically. To show the cross section as well as the surface, the samples were tilted by 30° for the SEM measurements. The sample with barrier layer (left) shows a continuous poly-Si film with Si islands on top (similar to what is shown in Fig. 12.5), whereas the sample without barrier layer (right) does not show a continuous poly-Si film but a porous film structure. The former interface between the A1 layer and the a-Si layer is not visible. In some parts, the... 

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