普通PS版感光特性的研究

计算机直接制版技术(CTP)是当前印刷技术领域研究的热点问题之一,采用传统PS版的计算机直接制版(CTCP)由于继续沿用传统的预涂感光版(PS版),在印刷适性、耐印力、印品分辨率等方面具有明显的优势,同时成本低,市场量大。但人们对PS版感光材料曝光特性的研究相对较少,本文给出了1种超感度重氮盐PS版的最低曝光能量同波长之间的关系,在波长405nm处所需的临界曝光能量仅为10.35m J/cm2。从曝光前后颜色密度值变化、感光材料红外分析方面,对PS版的曝光效果做了详细的测量。     

阴图PS版感光层的光交朕

阴图ＰＳ版感光层的光交朕曹曙光，王仁祥，曹维孝（北京大学化学与分子工程学院，北京１００８７１）关键词重氮树脂；成膜树脂；阴图ＰＳ版；光交联阴图ＰＳ版感光层主要是由成膜树脂和感光树脂组成。感光树脂一般是二苯胺或取代二苯胺重氮树脂．成膜树脂类型较多。就成...     

印刷制版用N_2等离子体蓝紫光源的实验研究

我国的印刷制版行业目前正处于从传统PS版向计算机直接制版(Computertoplate)技术转变的进程之中,PS版的产销量十分可观,在CTP技术中继续使用传统的PS版对我国印刷包装行业意义重大。实现传统PS版的CTP技术关键在于解决曝光光源问题。本文采用连续直流源空心阴极放电方式产生氮气等离子体蓝紫光源,成功地对一种超感度重氮萘醌系PS版进行曝光,从注入功率、放电气压等方面探讨了氮气等离子光源的最佳工作条件,在工作气压70Pa、放电电压580V、电流1.8A下获得了0.46mW/cm2的蓝紫光输出。气体放电光源还可轻易实现高频大功率脉冲输出,本研究结果表明,新型空心阴极氮气等离子体光源在实现PS版CTP技术方面具有一定的发展前景。     

阳图PS版感光液的发展状况

自1985年以来,我国的印刷业一直保持着持续和稳定的增长,其总产值以平均每年12％～15％的速度递增。基本与世界印刷业发展速度同步。但是从感光液的质量来看,普通产品多,优质产品少,国内的感光液大部分是采用重氮萘醌-酚醛树脂体系。为了提高感光液的质量,应加强对耐碱性、曝光宽容度、光分解碱溶性、显影宽容度以及涂布适应性的研究。     

阴图感光PS版进展(下)

本文主要介绍了阴图PS版的2种重要组成部分:感光树脂和成膜树脂,同时简要说明了紫激光CTP的最新发展情况。关于感光树脂,主要介绍了其发展历史和感光机理,并重点阐述了重氮树脂的特点和合成方法;成膜树脂,主要介绍了聚乙烯醇缩醛,聚氨基甲酸酯,聚(甲基)丙烯酸(酯)及其衍生物。     

阴图感光PS版进展(上)

本文主要介绍了阴图PS版的2种重要组成部分:感光树脂和成膜树脂,同时简要说明了紫激光CTP的最新发展情况。关于感光树脂,主要介绍了其发展历史和感光机理,并重点阐述了重氮树脂的特点和合成方法;成膜树脂,主要介绍了聚乙烯醇缩醛,聚氨基甲酸酯,聚(甲基)丙烯酸(酯)及其衍生物。     

阳图PS版用重氮萘醌系感光组成物研究进展

目前PS版在印刷领域仍占有较重要地位,重氮萘醌系感光组成物自20世纪应用以来,经久不衰。文章主要介绍了PS版用重氮萘醌系感光组成物的研究进展情况,包括重氮类感光化合物,与之配合使用的版基、成膜树脂、酯化体。同时产酸剂、背景染料、溶剂及其它添加剂简单进行了归纳,并研究了重氮萘醌系阳图PS版的配方化学及发展趋势。     

高速卷筒生产线阳图PS版感光胶与溶剂关系的研究

本文研究了阳图感光PS版感光涂布液常用溶剂的沸点、爆炸极限、危险温度、蒸汽压、黏度、蒸发热、闪点,通过不同溶剂的配合,配制了在低粘度下保有较高的固含量的可以应用在高速卷筒线的感光胶涂布液,并且在使用上做到了经济、环保和安全。     

高速卷简生产线阳图PS版感光胶与溶剂关系的研究

本文研究了阳图感光PS版感光涂布液常用溶剂的沸点、爆炸极限、危险温度、蒸汽压、黏度、蒸发热、闪点,通过不同溶剂的配合,配制了在低粘度下保有较高的固含量的可以应用在高速卷筒线的感光胶涂布液,并且在使用上做到了经济、环保和安全。     

一种用于CTCP技术的新型脉冲等离子体光源

继续沿用传统PS版的计算机直接制版技术(CTCP)对于我国的印刷包装行业具有特殊重要的意义。亟待解决的问题是实现光源对PS版的脉冲式曝光。本文报道了一套采用正弦脉冲高频电源激励的新型氮气等离子体光源,首次获得了光源的准脉冲输出,并成功的对一种超感度PS版进行了曝光。光谱分析表明氮气等离子体光源的光谱结构较碘镓灯更适于传统PS版曝光。进一步从电源电压、工作气压等方面探讨了光源的最佳运行参数,随着电源功率的增大和光源结构参数的优化,可望得到更大的光输出功率。本文对实现CTCP技术的脉冲式曝光具有一定的参考价值。     

用于CTCP技术的射频无电极放电氮气等离子体光源研究

本文报道了一种利用射频无极放电激励的氮气等离子体新型光源,成功地对“星光”PS版进行了曝光,光谱分析表明氮气射频放电光源的光谱结构较碘镓灯更适于传统PS版曝光。为此,进一步从射频功率、工作气压等方面探讨了光源的最佳运行参数,得到在230Pa、160W采用两个传输透镜聚焦后获得的光源功率密度是2.23mW/cm2。最后给出了运用此光源对PS版的曝光结果。     

光谱学法研究直流放电等离子体条件下甲烷的分解和碳二烃的形成

The IR emission spectra of methane were measured under DC glow discharge conditions. The distinct difference in time between methane decomposition and C2 hydrocarbons formation was specially pointed out. C2 hydrocarbons formed at the end of methane decomposition. The optimum condition for C2 hydrocarbon formation was studied and the optimum combination between electric current density and methane input quantity was suggested. The appropriate reaction conditions for methane decomposition and C2 hydrocarbons formation are different, so high yield of C2 hydrocarbons will be probably obtained when different conditions are taken.     

Effects of pH value and temperature on the corrosion behavior of a Ta2N nanoceramic coating in simulated polymer electrolyte membrane fuel cell environment

To improve the corrosion resistance and electrical conductivity of Ti-6Al-4V bipolar plates used in polymer electrolyte membrane fuel cells (PEMFCs), a novel electro-conductive Ta₂N nanoceramic coating was developed by reactive sputter-deposition using a double cathode glow discharge plasma technique. The microstructure of the coating consisted of fine equiaxed Ta₂N grains with an average grain size of ∼13 nm, which exhibited a strong (101) preferred orientation. To explore the influence of both pH values and temperatures on the corrosion resistance of the coating, the electrochemical behaviors and electronic properties of passive films grown on the Ta₂N coating were systematically investigated using different electrochemical techniques in simulated PEMFC operating environment. It was shown that either increasing the acidity or the temperatures of the solution, the corrosion potential (E_corr) decreased and the corrosion current density (i_corr) increased. At a given temperature or pH value, the Ta₂N coating had a higher E_corr and lower i_corr as compared with uncoated Ti-6Al-4V. The results of EIS measurements showed that with increasing temperature or acidity of the solution, the resistance of the passive film (R_p) formed on the Ta₂N coating decreased slightly, being of the order of magnitude of 10⁷ Ω cm², which was an order of magnitude higher than that of uncoated Ti-6Al-4V. The interfacial contact resistance (ICR) values were found to increase with increasing pH value or decreasing solution temperature, and the ICR values of the Ta₂N coating were markedly lower than that of uncoated Ti-6Al-4V, due to the thinner thickness of passive films. Furthermore, the Ta₂N-coated Ti-6Al-4V is more hydrophobic than bare Ti-6A1-4V, which was favorable for both the simplification of water management and improving corrosion resistance in PEMFC operating environment.     

Development of a Rapid Ultra High-Performance Liquid Chromatography/Tandem Mass Spectrometry Method for the Analysis of sn-1 and sn-2 Lysophosphatidic Acid Regioisomers in Mouse Plasma

Lysophosphatidic acids (lysoPtdOH) are involved in several physiological processes including cell proliferation, inflammation, and glucose metabolism. However, measuring lysoPtdOH is challenging due to inadequate extraction techniques, poor chromatographic resolution, or the inability to discriminate between sn-1 and sn-2 regioisomers. In the present work, we developed a high-throughput (10 min run times) ultra-high-performance liquid chromatography–tandem mass spectrometry method capable of discriminating lysoPtdOH species by their fatty acyl composition and sn-localization on glycerol backbones. We quantitated sn-1/sn-2 regioisomeric pairs of lysoPtdOH with 16:0, 18:0, 18:1, 18:2, 20:4, and 22:6 fatty acyl chains using 50 μL of mouse plasma. The method presented here can be expanded to profile more lysoPtdOH species, and has the potential to be used in clinical settings to quickly screen lysoPtdOH profiles. Finally, the ability to discriminate between sn-1 and sn-2 isomers can provide insights regarding the metabolic origins and fates of specific lysoPtdOH molecules.