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L. S. Tang 《Polymer-Plastics Technology and Engineering》2013,52(6):614-620
The present study was carried out to evaluate the performance of nickel-coated graphite (NCG) in comparison with graphite as conductive fillers in polypropylene (PP) matrix. Graphite exhibits smaller particle size and higher aspect ratio (length/thickness) than NCG particles. The results showed that the additions of graphite filler in PP exhibits higher tensile properties and electrical conductivity compared to NCG filled PP composites. The electrical results showed that the percolation threshold of graphite and NCG filled PP composites occurred in the range of 10 to 20 vol.% and 15 to 25 vol.%, respectively. 相似文献
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[Fe(CN)6]^4—在溴碘化银T—颗粒乳剂中的掺杂 总被引:5,自引:1,他引:4
本文研究了K4[Fe(CN)6]掺杂对溴碘化银T-颗粒乳剂感光性能的影响.结果表明,掺杂剂的掺杂量以及掺杂位置对乳剂的感光性能都有影响.K4[Fe(CN)6]的掺杂量在每克乳剂3.1×10-93.1×10-11mol之间时,乳剂感光度都有提高.最佳掺杂量为每克乳剂3.1×10-10mol.掺杂位置接近表面时效果相对较好,表明K4[Fe(CN)6]是浅电子陷阱掺杂剂.当掺杂剂的掺杂量大于每克乳剂3.1×10-8mol,且掺杂位置在乳剂颗粒较深内部时,乳剂的感光度反而下降. 相似文献
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The Fe(CN)3-6/Fe(CN)4-6 reactions have been studied by stationary and transient polarization measurements on potentiostatically well stabilized (18–20 h) passive titanium electrodes at 25°C. The reactions appear first order in reactant dependence, provided an extra inhibiting effect of Fe(CN)4-6 is built into the rate constants. They further depend on the electrode potential, the solution pH, the passive film thickness and the way of forming the passive film. The results support that the electron exchange mainly occurs with the metal through thin passive films (< 45 Å) and with the conduction band in the oxide of thicker films. 相似文献
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导电电磁屏蔽塑料研究新进展 总被引:1,自引:0,他引:1
介绍了电磁屏蔽的基本理论,重点综述了3类主要的导电塑料即:表层导电型复合塑料、填充型复合塑料和本征导电高分子材料的研究应用现状,介绍了各类导电高分子电磁屏蔽材料的特点,并对其发展趋势做了展望。 相似文献
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《分离科学与技术》2012,47(7):659-662
Abstract An experimental study is presented on the continuous flow, foam fractionation of cyanide complex anions. Zn(CN)4 2-, Cd(CN)4 2-, and Hg(CN)4 2- form 7.5 × 10?6 to 1.5 × 10?5 M aqueous solutions with the quaternary ammonium surfactant, hexadecyltrimethylammonium iodide. The selectivity coefficients were determined for Zn(CN)4 2- vs I? equal to 8.86. for Cd(CN)4 2- vs I? equal to 21.79 and for Hg(CN)4 2- vs I? equal to 25.12. The surfactant ion-exchange reaction with the studied complex ions was also suggested. 相似文献
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Hybrid films of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) were prepared with different molecular weights of poly(ethylene oxide) (PEO). The cross-linking reaction between PEO and PEDOT:PSS was performed at high temperature and confirmed by using differential scanning calorimeter (DSC), contact angle measurement, and solid-state 1H NMR. The effect of chemical reaction on the conductivity and morphology of these hybrid films was studied by using 4-point probe and atomic force microscope (AFM), respectively. As-spun PEO/PEDOT:PSS films have lower electric conductivity due to the addition of nonconductive PEO, and exhibits no molecular weight dependence on conductivity. After chemical cross-linking reaction at high temperature, only PEDOT:PSS films with lowest molecular weight PEO additives show enhanced conductivity with increasing reaction time. AFM result indicates that the heat-treated PEO/PEDOT:PSS hybrid films show grain-like morphology compared to ethylene glycol treated PEDOT:PSS films which shows continuous PEDOT domain. In the present work we demonstrate that the cross-linking reaction can be used to improve the wet stability of PEDOT:PSS nanofiber, showing good water resistance and excellent dimensional stability. 相似文献
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基于聚合物/黏土纳米复合材料专利数据,对中国专利中的专利申请的相关领域的申请时间分布、申请人情况和技术构成等角度进行分析表明,该领域的专利申请基本上从3个方面进行保护,即聚合物/黏土纳米复合材料、聚合物/黏土纳米复合材料的制备方法、黏土组合物(包括黏土和改性剂);专利申请的发明重点在于聚合物基体种类、黏土改性剂的组分,以及复合材料制备方法。在中国申请的专利中,外国申请人一般企业居多,中国申请人主要是高校和科研院所。 相似文献
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用旋转环盘电极研究了还原剂K_4Fe(CN)_6与n-CdSe光阳极上的竞争空穴的氧化反应,证明还原剂捕获光生空穴的途径为直接自价带俘获空穴。又利用L-B技术在n-CdSe电极表面修饰硬脂酸二茂铁酯,结果表明还原剂俘获光生空穴的能力增强,电极的稳定系数提高。 相似文献
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旋转环盘电极(RRDE)研究表明,多晶n-CdSe电极表面经金属离子溶液处理,提高溶液的pH及增加溶液中还原剂K_4Fe(CN)_6的浓度均使该电极在K_4Fe(CN)_6-FDTA体系中的稳定因子S提高。用Au、Ru、Pt及Pb等离子溶液处理电极表面时,S值增大。Ru离子处理使S增大几乎可达1。从X射线荧光光谱和Mott-Schottky关系图分析证明,处理后的CdSe多晶电极表面沉积了一层金属薄层。本文对电极表面沉积的金属薄层、溶液pH等的影响、稳定因子S提高的原因也作了初步讨论。 相似文献
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本文简述了黄血盐钠生产过程中结晶温度的控制 ,用一元一次分段函数描述了结晶温度随时间变化的一般规律 ,对黄血盐钠的生产有一定的指导意义 相似文献
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4′ 羟基联苯 4 甲酸与甲醇反应,合成了4′ 羟基联苯 4 甲酸甲酯。后者与1,6 二溴己烷反应合成了目标化合物4′ (6 溴己氧基)联苯 4 甲酸甲酯,反应工艺条件为:以无水乙醇为溶剂,n(4′ 羟基联苯 4 甲酸甲酯)∶n(碳酸钾)∶n(1,6 二溴己烷)=1∶1 5∶3,80℃反应8h,收率达60 8%。两步总收率57 6%。目标化合物经IR,1HNMR和元素分析确证了分子结构。 相似文献
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以季戊四醇(PET)为引发剂,在辛酸亚锡催化下,丙交酯(LA)开环聚合合成了四臂星型聚丙交酯(PETPLA4),对其分子链末端羟基进行羧基化后与聚乙二醇(PEG)反应合成了四臂星型聚丙交酯-聚乙二醇[PET-(PLAPEG)4]。N-羟基琥珀酰亚胺与生物素反应合成了琥珀酰亚胺生物素酯(Biotin-NHS),与PET-(PLA-PEG)4反应合成了四臂星型生物素化聚乙二醇-聚丙交酯[PET-(PLA-PEG-biotin)4]。通过核磁和凝胶渗透色谱对其化学结构和分子量进行了表征,通过示差扫描量热仪及界面张力仪对其热性能和亲水性进行了测定。结果表明,此聚合物结构明确,分子量分布较窄,其热性能与聚丙交酯明显不同,其亲水性相对于聚丙交酯有明显改善。 相似文献