Advanced Materials Research Vol. 380

Abstract: In order to better promote the localization of Positive CTP (Compute To Plate), based on the results of previous studies in our laboratory, synthesize an ether compounds of polycondensation resin of the pyrogallic acid and the divinylbenzene. The best conditions of the synthesis have been studied in the catalyst, solvent, reaction temperature, reaction time and molar ratio of reactants. The thermal CTP plate had been made by the new ether compounds of polycondensation resin of the pyrogallic acid and the divinylbenzene, it showed an excellent imaging performance.

Abstract: In this paper, 4, 4’-Azobisphenol was synthesized with three methods which were high temperature reduction, Pb-reduction and diazotize-coupling, and diazotize-coupling was the best way. 4, 4’-Azobisphenol derivatives-1, 2- bis(4-(alloxy/hexyloxy)phenyl) diazene were synthesized through etherification. The structures of these compounds were characterized by the methods of 1H-NMR and FTIR. Phase-transition temperature was measured by DSC, and the phase behaviors were studied by the polarizing microscope. In those derivatives, only1, 2- bis(4-(hexyloxy)phenyl) diazene had mesomorphic phase and mosaic texture. Its mesomorphic phase temperature ranged from 89.3°C to101°C.

Abstract: Some improvements had been made to the way of synthesis of diazoresins used in waterless lithographic printing plate by adjusting pH to 7 when anion exchanging and so on. Diphenylamine-4-diazonium salts (DDS) and the corresponding resins (the polycondensation product with formaldehyde) were synthesized and their structures were identified on the basis of their spectroscopic IR and 1H-NMR. The result of the experiment indicated that the diazoresins synthesized by this way had better resolvability, especially mesitylenesulfonate diazoresine and dodecyl benzenesulfonate diozoresin. What’s more, these diazoresins were applied to imaging composition of waterless lithographic printing plate with polyvinyl butyral resin and colorizing background dye. And an ink-repellent crosslinked silicone elastomer layer was superimposed on the light-sensitive layer above. The result showed that the waterless lithographic printing plate had excellent sensitivity, developing latitude, good ink receptivity and good ink repellency in the background areas.

Abstract: A kind of novel liquid crystalline monomer containing double photosensitive groups which were azo and chalcone groups was synthesized. The structures of the intermediates and the final monomer were confirmed by FT-IR and 1H NMR spectra. The thermal properties of monomer were measured by DSC and the liquid crystalline texture was measured by polarized optical microscopy. And the results indicated that the monomer showed nematic phase and liquid crystal temperature range was 150.8-186.5oC.

Abstract: A reversible addition fragmentation chain transfer (RAFT) agent, 2-(dodecylthiocarbonothioylthio)propanoic acid (RAFT-1), was synthesized and characterized. Diacetone acrylamide and poly(ethylene glycol)methyl ether methacrylate were polymerized in the presence of RAFT-1 to give an amphiphilic polymer(RAFT-2). A very stable and narrowly-distributed emulsion was obtained by the micellization of the amphiphilic polymer in water. The self-crosslinking resin system was prepared by adding a crosslinker (adipic dihydrazide) to the prepared emulsion. Upon the evaporation of water of the emulsion, a tough and transparent crosslinked film was prepared, which had good water/solvent resistance and certain adhesiveness.

Abstract: In this study, Zinc oxide (ZnO) nanoparticles were prepared using Zinc nitrate (Zn(NO₃)₂) and Ammonium carbonate ((NH₄)₂CO₃) in aqueous solutions with proper concentration by a direct precipitation method. The properties of ZnO nanoparticles synthesized were characterized by the thermal gravimetric (TG) and differential thermal gravimetric (DTG), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM), respectively. Both TG and DTG curves of the precursor precipitates show that no further mass loss and thermal effect were observed above the temperature 450°C. The FT-IR results indicated that the precursor of ZnO nanoparticles was zinc hydroxy carbonate. The XRD results show that the prepared ZnO nanoparticles were pure wurtzite structures. TEM photographs demonstrated that ZnO nanoparticles were of a pseudo-spherical shape with an average crystal size of about 65 nm.

Abstract: The yellow-green fluorescent material 2-[2-(p-toluenesulphonylamino)phenyl]-4H-3,1- benzoxazin-4-one (TSPAPB) was synthesized by anthranilic acid and p-toluenesulphonyl chloride. Strong photoluminescent peaks were nearly at 530 nm. The fluorescence lifetime of solid powder was measured to be 6.47 ns by transient fluorescence spectrometer. HOMO and LUMO energy levels were calculated -4.92 and -1.61 eV. The multilayer yellow-green organic light-emitting devices (OLED) ITO/NPB/TSPAPB/BCP/TPBi or Alq3/LiF/Al were fabricated. Device A and B exhibited emissions at 576 nm with current efficiencies (CE) of 1.09 and 0.86 cd/A. The yellow-green electroluminescent peaks of Device C and D were at ca. 588 nm with current efficiencies of 0.94 and 0.68 cd/A, respectively. The characteristics of devices demonstrated that TSPAPB was a yellow-green emitter suitable for OLEDs.

Abstract: Using Sol - gel prepared SiO₂ and TiO₂ thin film and coating on the glass substrate, this paper studied TiO₂ thin films as a new type of printed material with the illumination time and the infiltration of the relationship between light intensity and illumination time on the water-based ink on film surface adsorption. The results show that: TiO₂ thin film by ultraviolet irradiation, its hydrophobic property drastically reduced, and showed super hydrophilic properties and water contact angle down to 5°or less. Thesis results show that: TiO₂ thin film with light-induced amphiphilicity expected as a new type of environmentally friendly reusable printing plate.

Abstract: In this paper the vibration testing and Fast Fourier Transform(FFT) analysis detection on the basis of nondestructive testing method were analyzed. The dynamic Young’s modulus of the regeneration pre-sensitized offset plate were obtained by using the nondestructive testing methods, including the dynamic Young’s modulus by longitudinal vibration method, the dynamic Young’s modulus by out-plane flexural vibration method, and the dynamic Young’s modulus by in-plane flexural vibration method. The linear correlativity was investigated between the dynamic Young’s modulus and the modulus of elasticity(MOE) for the regeneration pre-sensitized offset plate.The linear correlations between the dynamic Young’s modulus and the MOE were good. So it is feasible to predict and analyze the plate mechanical properties put forward the nondestructive testing method of key mechanical performance parameters.