Papers by Author: Jia Ling Pu

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Authors: Zhong Xiao Li, Wu Kun Fan, Jia Ling Pu
Abstract: A modified phenolic resin containing tertiary amine oxide was prepared via a two-step method. Epoxy phenolic resin, F-48, was reacted with dimethylamine to give the phenolic resin containing the tertiary amine group, which was then oxidized with hydrogen peroxide to obtain the target product. The tertiary amine oxide-containing resin could easily dissolve in water. However, it became water insoluble after heat treatment at a high temperature such as 160 °C. Thermal properties of the tertiary amine oxide resin were studied with DSC and TGA. A thermo-sensitive film comprising the prepared resin and an IR-dye was prepared and laser-induced thermal imaging was also conducted. This material might be used to develop new chemistry-free printing plates.
Authors: Ti Wu, Wei Min Zhang, NA Yang, Jia Ling Pu
Abstract: Three copolymers containing isobutyl p-styrenesulfonate (IBSS) and carboxyl units, i.e. methyl methacrylate (MMA) and methacrylic acid (MAA), were synthesized and their chemical structures and thermal behaviors were investigated by using TGA, DSC, FTIR and other methods. Films were prepared by using the synthesized copolymers in combination with a bisvinyl ether compound, i.e. 2,2-bis(4-(2-(vinyloxy)ethoxy)phenyl)propane (BVPP), to applied onto an aluminum plate. Crosslinking and de-crosslinking reactions would readily take place when the polymer films were baking treated at 100 oC and 200 oC for a short period of time, respectively. Along with the chemical structural changes during thermal treatments, an affinity change was achieved from being insoluble to completely soluble in neutral water. A positive-working and neutral water-developable imaging material was proposed and preliminary studies on the imaging properties were conducted.
Authors: Jun Ping Li, Wei Min Zhang, Jia Ling Pu
Abstract: This paper reported a novel method to measure photoinduced acid generation in polymer films, which were widely used in microlithography. The method employed Rhodamine B (RB) as acid sensor due to its changes in color and uv-vis absorbency in acidic condition. The property of Rhodamine B was examined in hydrochloric and trifluoromethyl sulfonic acids, and the standard working curves in thin polymer film were set up, which indicated the relationship of acid concentration and Rhodamine B’s relative peak absorption ("ABS). In this case, the difference in absorbency could reflect the different amounts of acid generated. According to these standard working curves, we can calculate the efficiency of photoacid generator (PAG). This method has advantage over existing method in measuring the efficiency of photoacid generator in solution, because it eliminated the influence of solvents.
Authors: Jun Jie Gong, Zhong Xiao Li, Jia Ling Pu
Abstract: In isopropanol-water mixture, a polymer emulsion was prepared through the radical copolymerization [1,2] of styrene, acrylonitrile and 4-vinyl pyridine in the presence of azodiisobutyronitrile (AIBN) and a reactive emulsifier which was synthesized through the addition reaction of 2-isocyanatoethyl methacrylate and methoxypolyethylene glycols (Mn ≈ 2000). The polymer particles were narrowly distributed and had an average size of about 110 nm in diameter. Hydroxypropyl cellulose was used as the binder resin for the emulsion film. The emulsion coating was prepared by coating the mixture of the polymer emulsion and the water solution of the binder resin on aluminum substrate and dried at about 80°C. The resulted film can be easily removed from the substrate with water rinsing. However, once the coating is heated at a temperature which is much higher than the glass transition temperature (Tg) of the particle polymer (e.g., 150°C) for a short period of time, it could no longer be removed from the substrate by water. On the basis of the above work, a water soluble infrared-absorbing dye (IR dye) was incorporated into the emulsion coating and exposed to computer-controlled IR laser (830nm) scanning. The exposed areas could not be removed with water cleaning, whereas the non-exposed areas could still be easily removed with water. Negative images were obtained. Hence, the emulsion coating can be used in developing chemical-free CTP plates required by green printing industry.
Authors: Jia Ling Pu, Zhong Xiao Li
Abstract: The performances of CTP plate depend heavily on polymer binder and those capable of producing large image contrast by exposure are keys to quality plate. This research proposed a polymer resin containing hydrophilic spices in the side chain which could be sheltered by the thermal induced crosslinking reaction during plate manufacturing process and released upon imaging exposure. The resin was prepared through esterification reaction of maleic anhydride with phenolic resin, and its chemical structure was characterized by IR spectrum. Plate coatings were formulated with the modified polymer as binder resin, 2,2-bis(4- (2-(vinyloxy)ethoxy)phenyl)propane as the crosslinking agent, a near infrared absorbing dye and crystal violet as the tracing agent. Solubility of the exposed and unexposed coatings in diluted aqueous alkaline was investigated in situ using a home-made dissolving rate tester. It was found that polymer containing 4-6% mole carboxyl groups led to high image contrast and this contribution came directly from the cross-linking and decrosslinking reactions. Preliminary test indicated that this polymer coating generated positive image of high contrast after exposure and could be used as CTP plate coating for thermal laser imaging.
Authors: Chun Xiu Zhang, Zhi Qun He, Jia Ling Pu, Yu Ning, Hao Wu, Chuan Yue Wang, Ming Zhang
Abstract: The alignment of 2, 3, 6, 7, 10, 11-hexapentaloxy triphenylene (HAT5) on ITO glasses was investigated by polarizing optical microscopy, differential scanning calorimeter, X-ray diffraction and scan scanning electron microscope in this study. The results showed that the alignment of 2, 3, 6, 7, 10, 11-hexapentaloxy triphenylene can be fixed at room temperature by heating the sample to the isotropic temperature and annealing at 100°C overnight and then cooling slowly back to room temperature; the ordered arrangements of the micro structures are disconnected. The disconnection of the microstructure and the size of columnar assemblies can also be confirmed from the SEM observations.
Authors: Yu Jiang, Xu Ying Liu, Rui Cheng, Wen Guang Wang, Jia Ling Pu
Abstract: In this paper, a novel protocol of akylation to tolan using CuI/HMPA as catalyst for synthesizing alkyl-substituted hexabenzocoronene (HBC) was described. The key step in the route was the construction of tolan bearing 2 long side chains, which was completed in the first step via coupling reaction between 4, 4’-Bis (bromomethyl) tolan (1) and Grignard Reagent in a mild condition. Afterward, Co2(CO)8 catalyzed cyclotrimerization gave hexaphenylbenzene derivative (HPB) which could be easily separated by column chromatography and recrystalization. The planarization of HPB was carried out with FeCl3 /MeNO2 to afford the desired HBC with long odd-carbon alkyl chains in good overall yields.
Authors: Wen Guang Wang, Xu Ying Liu, Ling Liu, Jia Ling Pu
Abstract: Asymmetric substituted coronenes as building blocks for preparation of materials used as functional molecular devices in the fields of self-organization, organic light-emitting diode, photovoltaic solar cell and field effect transistor are easily converted to potential interesting coronene’s derivatives. A novel kind of derivative of dibenzocoronene with perylene tetracarboxdiimide as discotic liquid crystal with two kinds of soft and long chains was designed and synthesized. Its structure was confirmed by 1HNMR and IR. Its UV-vis was measured. Its properties as discotic liquid crystal are investigated in progress.
Authors: Jiao Yang, Wei Min Zhang, Jin Cao, Jia Ling Pu
Abstract: A copolymer liquid crystal with a coumarin side group is synthesized and investigated. Under different exposure energy, the thin film of copolymer is irradiated by linearly polarized ultraviolet light (LPUV). Moreover, through changing exposure temperature and annealing temperature to investigate its photoreaction properties and reorientation performance. It is made clear that the value of optical anisotropy appears maximum with the increase of exposure energy. However, with the exposure temperature increasing, the Photo-Fries rearrangement tend to be occurred and the degree of the cyclo-addition reaction is reduced. Finally, dealing the exposed film with the liquid crystal temperature, the optical anisotropy of the film has cyclical change, but the maximum anisotropy remains nearly unchanged.
Authors: Xu Ying Liu, Yu Jiang, Rui Cheng, Wen Guang Wang, Jia Ling Pu
Abstract: Two HBC derivatives (HBC-C13 and HBC-C15), both containing 6 odd-carbon alkyl chains surrounding the rigid plane core, were investigated as discotic liquid crystal. The difference between their thermal behaviors has been investigated by using differential scanning calorimetry (DSC). Their mesomorphic phase behavior was observed by polarizing optical microscopy (POM). A remarkable odd-even effect in the phase transition temperatures was observed for all HBC derivatives (HBC-C12, HBC-C13, HBC-C14, HBC-C15 and HBC-C16).
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