铜填充导电涂料的研究

本文研究了以醇酸树脂为基料、铜粉为填料的导电涂料中填料浓度与漆膜电阻率的关系.实验表明,油酸、有机钛酸脂添加剂有提高铜系涂料导电稳定性的作用,可望制得导电性能和导电稳定性满足电磁屏蔽要求的漆膜.     

铜系水性丙烯酸电磁屏蔽涂料的制备

研制了一种以丙烯酸树脂乳液为基料、自制铜粉为导电填料的水性电磁屏蔽涂料,结果表明:当铜粉加入量为65%、漆膜厚度为125μm时,该涂料的表面电阻率为0.04?/cm2,在200 kHz～300 GHz频段范围内的电磁屏蔽效能最低为71 db.     

石墨/丙烯酸树脂电磁屏蔽涂料制备的初步研究

在以水溶性丙烯酸树脂为基体,导电石墨为导电填料,通过高速分散制备电磁屏蔽涂料的体系中分别加入曲拉通X 100、OP-10、聚环氧乙烯基醚、阴离子型聚丙烯酸等分散助剂及钛酸酯偶联剂,采用不同共混工艺,希望改善石墨颗粒在聚合物中的分散性能,从而赋予涂料较高的电磁屏蔽效能;采用正交实验法,甄选在本实验条件下的最优导电填料用量、分散助剂及共混工艺.结果显示,该体系的最佳配方为:导电石墨用量为树脂重量的40%,分散剂种类为OP-10,分散剂用量为石墨重量的10%;共混工艺为偶联剂干法预处理;所选用偶联剂对实验影响相当较小.     

聚苯胺-聚合物纳米复合材料的制备及应用

聚苯胺-聚合物纳米复合材料的制备方法可分为原位聚合法和机械共混法两大类.聚苯胺-聚合物纳米复合材料在透明导电薄膜、防静电涂料、导电纤维、电磁屏蔽、有机电致发光器件等领域有着广阔的应用前景.     

电磁屏蔽涂料研究进展

对电磁屏蔽原理及掺和型导电高分子材料的导电机制有关理论作了综述,概述了掺和型电磁屏蔽涂料的常用导电填料、复合工艺及性能影响因素,尤其介绍了复合工艺的最新进展--原位插层复(聚)合法.     

纳米石墨基导电复合涂料的电磁屏蔽性能

以纳米石墨微片作为导电填料,高分子树脂作为粘结剂,制备高导电性复合涂料,研究其电磁屏蔽等相关性能.探讨纳米石墨微片、基体树脂、表面改性剂、溶剂,以及分散工艺和施工工艺对导电涂料的导电性及电磁屏蔽效能的影响.结果表明,质量分数为30%的纳米石墨微片,质量分数为5%的阳离子分散剂,质量分数为65%的丙烯酸树脂,以及适量混合溶剂为较佳配方,而以机械研磨辅以超声分散是较好分散工艺.通过该法制备得到的导电涂料,其涂膜的表面电阻率低至0.6Ω.m-1,电磁屏蔽效能达到38 dB(1.5 GHz).     

电磁屏蔽胶合板同轴测试方法的改进

针对叠层型电磁屏蔽胶合板导电层不在材料表面,导致了常规方法制备的试样电磁屏蔽效能测试结果不准确的问题,应用改进型的法兰同轴测试装置,研究了在100kHz～15GHz频段、远场条件下的同轴测试方法。采用导电涂料将试样封边的方法,减小了试样与内外导体接触阻抗对测试结果的影响,提出了一种较为恰当的试样制备方法。     

航天服用“屏蔽-发热”一体化导电织物的制备

航天服是保障航天员生命安全与工作环境的密闭多功能服装,具有阻挡辐射、维持宇航员体温等功能.本文分别选用亚麻织物、竹浆纤维织物和涤纶织物作为织物基底,采用简单高效的化学镀技术制备兼具电磁屏蔽效能和发热性能的"屏蔽-发热"一体化Cu-Ni合金导电织物.利用XRD和SEM表征导电织物的微观形貌和晶体结构,利用TGA来表征导电织物的热稳定性,并探讨了不同导电织物的电磁屏蔽效能和发热性能.结果表明:不同基底的"屏蔽-发热"一体化导电织物均表现出优异的屏蔽和发热性能.     

抗蚀聚酯环氧丝网印刷涂料的研制

以三羟甲基丙烷、间苯二甲酸、Cardura E10(E10)为原料合成聚酯树脂,探讨E10对聚酯树脂性能的影响;通过聚酯树脂、环氧树脂和氨基树脂制备丝网印刷涂料,研究环氧树脂用量和品种、功能性助剂对丝网印刷涂料性能的影响.工艺条件为m(E-44)/m(E-51)=2.33-4,w(H-201)=0.15%-0.2%,w(有机膨润土)=2.0%-4.0%,w(对甲苯磺酸)=3.0%-3.5%时,丝网印刷涂料150℃下烘干300 s,硬度为3 H,耐5%的HCl、H2SO4、NaOH和NaCl溶液7 d涂层不起泡、不脱落.     

导电粉末与木单板复合材料性能研究

在脲醛树脂胶中加入超细铜粉(Cu)、超细镍粉(Ni)以及石墨粉(CP)导电单元,制备3层结构的落叶松复合胶合板。分析了导电单元不同施加量以及涂胶量对木基复合材料电磁屏蔽效能和胶合强度的影响。结果表明,复合材料的胶合强度达到或超过国家标准。在施加超细铜粉条件下,由于铜粉氧化,胶合板的电磁屏蔽效能为0.00 dB。在施加超细镍粉条件下,电磁屏蔽效能为0.00~10.10 dB;在施加石墨粉条件下,电磁屏蔽效能为528~13.13 dB。导电单元的加入有利于导电网链的形成,但对胶合强度有不利影响,进而不利于胶合板的导电性,因此电磁屏蔽效能是这两个方面综合作用的结果。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with