Recording, polymer image

Comparison of Conventional Silver Emulsion and Unconventional Polymer Image Recording... 

Research on liquid crystalline polymers(LCP) is a fashionable subject with the goal of developing speciality polymers of superior mechanical and thermal properties. Besides these properties, other interesting properties of LCP have not been fully utilized. We are trying to use thermotropic LCP for photon-mode image recording material. 

From the previous demonstration of various phase transitions in small molecular systems, photochemical image recording on polymer films with amplification seems to be a promising approach to a new information storage material. While use of a polymer film will improve image stability when the polymer is kept below T , the restricted molecular motion in the solid polymer may reduce6the response time. 

Figure 3 shows four series of EFM images recorded on different polymer melt film species. The first image of each series shows the non-charged melt film surface (initial state). Employing a conductive silicon cantilever charges were deposited on the polymer melt film surfaces. Immediately after the charge deposition the time was set at t = 0. 

Blinov, L. M., Gipparone, G., Kozlovsky, M. V., Lazarev, V. V., Scaramuzza, N. Holographic development of a hidden UV image recorded on a liquid crystalline polymer. Optics Commun. 73, 137 (2000). 

The increased interest in energy sensitive polymers probably evolves from the shortcomings of the conventional image recording media-silver halide emulsion. It is both difficult and expensive to apply emulsion films as protective layers or use as printing plates or etch resists. Synthetic polymers are one to two orders of magnitude less radiation sensitive than halide emulsion, but their unique properties of chemical and physical resistance easily overcome this disadvantage, ( ., Table IV). 

Figure 3.81. Two-photon fluorescent images recorded by channel 1 (a) or channel 2 (b) that is formed via 350-nm broadband exposure of photosensitive polymer films containing 43e2 and triarylsulfonium hexafluoroantimonate as photoinduced acid generator using a light intensity of 4.4mW/cm2. (From Ref. [118] with permission of the American Chemical Society.)...

Y. Kawanishi, T. Tamaki, and K. Ichimura, Reversible photoinduced phase transition and image recording in polymer-dispersed liquid crystals, J. Phys. D Appl. Phys. 24, 782-784 (1991). 

Care must be taken to not spill any liquid onto the piezo transducer since this can cause a local short circuit and thus terminal damage to the piezo (for a typical image recorded with a damaged piezo transducer see Fig. 3.35, left2). In order to protect the piezo from accidental liquid spillage, the top of the scanner tube can be wrapped into a very thin polymer film (e.g. Parafilm, American National Can, Neenah, WI). For this purpose, the film is pre-stretched and then gently wrapped over the tube end (see schematic Fig. 3.35, right). It is also clear that the sample size should... 

Figure 13.12 (a) Spatially resolved PA IR emittance spectral image recorded for a stack of three polymer thin films heated to 120°C (b) The corresponding emittance spectra. Reproduced with permission from Ref [37],... 

We chose a polyacrylate with liquid crystalline side chains as shown in Fig. 4. The family of this polymer with different alkyl spacers has been prepared by Ringsdorf and coworkers(25). Recently, they reported an interesting application of the following polymers for image recording(26-28) by means of the photoinduced phase transition principle. 

The polymers are glassy and of good thermal stability. Their dielectric properties remain substantially constant over a wide range of temperatures. They are suitable for electrical applications. They have been used as capacitors [13], insulators, and foams [14], and in image recording systems [15]. 

Tazuke, S. Kurihara, S. Ikeda, T. Amplified image recording in liquid crystal media by means of photochemically triggered phase transition. Chem. Lett. 1987, 76(5), 911-914. Seki, T. Dynamic photoresponsive functions in organized layer systems comprised of azobenzene-containing polymers. Polymer J. 2004, 36, 435 54. 

---