碳黑/聚酯纤维非连续性导电行为研究

以熔体纺丝方法制备了碳黑/聚酯(CB/PET)导电纤维,分析了偶联剂对CB/PET纤维渗流阈值和T_g的影响,研究了碳黑含量与CB/PET纤维热性能和导电性能的关系。结果表明碳黑经偶联剂处理后,CB/PET纤维的渗流阈值和T_g均有所降低;碳黑含量对CB/PET纤维的性能影响显著,即随碳黑含量增加,CB/PET纤维的正效温度系数效应向高温移动;当碳黑含量为11%时,CB/PET纤维表现为较明显的正效拉力系数效应。     

聚苯并噁嗪基高导电复合材料的电性能研究

采用片状石墨(GP)、短切碳纤维(SCF),利用高温模压复合的方法,制得高固含量的聚苯并噁嗪/GP/CF导电复合材料(φc＞80%),通过分析导电填料GP丙酮溶剂化处理前后的红外谱图变化,以及导电填料GP和SCF的复配前后材料体积电阻率变化,研究了导电性有明显差异的原因.     

Electrosynthesis of conducting polyanilines in biphasic media

The electrochemical polymerization of aniline has been studied in the biphasic media. One phase comprises a polar medium containing some added electrolytes and the other a non-polar solvent containing the monomer. Ferric chloride has been used as the supporting electrolyte to catalyse the process of electropolymerization. Polyaniline was obtained in moderate yields with the highestR _p of 0·0237% per hour and a maximum polymerization efficiency of 61·65 ￠ 10⁻² mol/Faraday. The observations and experimental results suggest a cationic mechanism.     

La_（1－x）SrxCoO_（3－y）导电陶瓷制备工艺的研究

用固相反应法制备了Ｌａ＿（１－ｘ）Ｓｒ＿ｘＣｏＯ＿（３－ｙ）导电陶瓷材料，研究了制备工艺对烧结性能的影响。实验结果表明：烧结体的致密度取决于预烧温度、烧成温度及保温时间，此外还与成型方法等因素有关。在１０００～１３００℃保温２～１５ｈ获得了高密度、导电性良好的立方钙钛矿型Ｌａ＿（１－ｘ）Ｓｒ＿ｘＣｏＯ＿（３－ｙ）（ｘ＝０．５，０．６）陶瓷材料。用Ｘ射线分析了材料的相组成和结构。     

Defluoridation of water via doping of polyanilines

The potentiality of polyaniline and poly (m-methyl aniline) to remove fluoride from water via doping was investigated. The influence of pH, dosage of polyanilines, initial fluoride concentration and temperature on the amount of fluoride removed by the polyanilines were studied. The amount of fluoride removed at pH 7.0 by 50mg/50 ml dose was found to be 0.78 mg/g. The data of fluoride removal fitted well with Langmuir and Freundlich isotherms. Thermodynamic parameters computed show that the adsorption process is endothermic in nature. FT-IR, X-ray and EDAX patterns of the polyanilines before and after exposure to fluoride ions suggest that the defluoridation occurs via doping of fluoride ions onto these polymers.     

Synthesis and chemical properties of photoluminescent self-doped polyanilines

Fluorescent self-doped polyanilines (PAS-AntPy-a and PAS-AntPy-b) were obtained by the pyridinium sulfonation of poly(2-methoxyaniline-5-sulfonic acid) (PAS) with 4-(2-anthracene-9-yl-vinyl)pyridine (AntPy). The degrees of pyridinium sulfonation in PAS-AntPy-a and PAS-AntPy-b were 0.70 and 0.97, respectively. A neutral polyaniline with an AntPy side unit (PANI-AntPy) was synthesized by the oxidative polymerization of N-(2-aminophenyl)-4-(2-anthracene-9-yl-vinyl)pyridinium chloride. The UV-vis spectra of PAS-AntPy-a and PAS-AntPy-b exhibited an absorption due to the polaron band that was derived from the protonation of amine groups in the polyaniline backbone with the remaining sulfonic acid proton. In contrast, PANI-AntPy did not exhibit absorption due to the polaron band. PAS-AntPy-a, PAS-AntPy-b, and PANI-AntPy were photoluminescent in a solution. The electric conductivity of PAS-AntPy-a was σ = 1.5 × 10⁻⁷ S cm⁻¹, which was higher than that of H₂SO₄ doped PANI (4.2 × 10⁻⁹ S cm⁻¹) reported previously.     

中阻值导电塑料（浆料）的研制及性能研究

本文介绍了一种中阻值导电塑料(浆料)的研制及其电阻率、温度系数和粘度的测量,讨论了老化的原因及结果。     

铝及其合金化学导电氧化的生产工艺介绍(Ⅳ)

6 常见故障及其排除方法 表8 铝及其合金化学氧化时常见故障及其排除方法[14～17]     

炭纤维填充聚甲基丙烯酸三氟乙酯导电复合材料的性能

采用共混法制备了炭纤维（CFs）/聚甲基丙烯酸三氟乙酯导电复合材料。扫描电镜（SEM）图像表明,CFs表面含有少量的残留催化剂;拉曼光谱可看出CFs结构的有序性较低和石墨化程度较低;X射线衍射（XRD）显示,CFs存在石墨（002）和（100）面的特征衍射峰;X射线光电子能谱（XPS）说明CFs表面存在炭和氧两主要元素...     

Behavior of Pu(VI) and Np(VI) in malonate solutions

Complexation of PuO ₂ ²⁺ in solutions containing malonate anions C₃H₂O ₄ ^2? (L^2?) is studied by spectrophotometry. Mono-and bimalonate complexes are formed. The monomalonate complex was isolated as PuO₂L · 3H₂O. It is isostructural to UO₂L · 3H₂O and forms rhombic crystals with the unit cell parameters a = 9.078(2), b = 7.526(2), and c = 6.2005(15) Å, space group Pmn2₁. The electronic absorption spectrum of the monomalonate complex is characterized by a strong band at 843 nm. In malonate solutions, Pu(VI) is slowly reduced to the pentavalent state even in the cold. The reduction of Np(VI) is considerably faster and more sensitive to increasing temperature. Some kinetic features of the reduction are discussed.     

Conductive poly(methyl methacrylate)-polypyrrole dodecylbenzenesulfonate (PMMA-PPy.DBSA) blends prepared in solution in the presence of hydroquinone

Polypyrrole doped with dodecylbenzenesulfonic acid (PPy.DBSA) was synthesized. The solubility parameters were calculated, the most suitable solvent (chloroform) was chosen for the solubility and the most compatible polymer [poly(methyl methacrylate), PMMA] was selected for blending. Hydroquinone was used as a compatibilizer to maximize the miscibility of PPy.DBSA with PMMA, which facilitated easy processing of flexible and mechanically strong conductive PPy films for device applications. Electrical properties of PPy.DBSA-PMMA blends were studied in the presence of hydroquinone. Flexible and free standing films with different compositions of PPy.DBSA in PMMA were cast onto glass substrates. Optical micrographs showed a low level of phase separation in the presence of hydroquinone. Thermal events under DSC analysis showed temperature shifts relative to those of the pure polymers, supporting the evidence for attractive interactions between the polymers.     

Behavior of polymeric Pu(IV) in simulated groundwater

The effect of pH, ionic strength, and supporting electrolyte on the speciation of Pu(IV) in simulated groundwater over polymeric plutonium hydroxide at fixed values of the oxidation potential Eh was examined by centrifugal ultrafiltration. Upon dilution of simulated groundwater (SGW) containing highly polymerized polymeric Pu species of high molecular weight, these species transform into those with a lower degree of polymerization. When fresh SGW portions are subjected to ultrafiltration through a compact precipitate of colloidal Pu, this precipitate becomes a source of weakly polymerized Pu species, as in the case of common dissolution of a compact precipitate of colloidal Pu in SGW. In the process, the amount of weakly polymerized forms increases by two orders of magnitude as compared to the initial SGW over polymeric Pu hydroxide. These transformations of the initial Pu species in solutions can affect its migration behavior in subsequent processes.     

2,5—二(烷氧基)对苯乙炔共聚物的合成及其发光和导电性能

采用含氯前聚物路线合成 [2 ,5—二 (甲氧基 )对苯乙炔— CO— 2 ,5—二 (十二烷氧基 )对苯乙炔 ]无规共聚物。用元素分析、凝胶渗透色谱仪、吸收光谱及DSC进行表征。研究了投料比对共聚前聚物组成、收率、分子量及分子量分布的影响 ,并研究共聚物的组成与导电率、溶解性及发光性能的关系。     

Time-Dependent Behavior of Ceramic (Zirconia)-Metal (NiCoCrAlY) Particulate Composites

The estimation of time-dependent properties for ceramic-metal mixturesis important for analyzing the effects of thermal loading oncompositionally graded thermal barrier coatings. A mean fieldmicromechanics approach is developed to compute effective time-dependentproperties of ceramic (zirconia)-metal (NiCoCrAlY) particulate compositematerials. These properties are then used to predict the transientthermal stresses in these composites when they are subjected to thermalshock. These thermal stresses include the effects of time-dependentmaterial response.     

丁腈橡胶/导电粒子复合材料的正温度系数(PTC)特性

将导电粒子碳黑和铜粉分别与丁腈橡胶混合制备导电聚合物复合材料，其中碳黑（Ｎ５５０）／丁腈橡胶复合材料的电阻率随温度的变化呈现较强的正温度系数（ＰＴＣ）效应。讨论了掺入导电粒子浓度、结构和表面性质以及混炼硫化工艺等对该类材料的室温电阻率及ＰＴＣ效应的影响。     

Magnetostriction Behavior of Pseudobulk CoFeBSiNb(Ga) Systems

Co-based ferromagnetic amorphous systems prepared by rapid quenching are parts of a very interesting group of materials from the perspective of new magnetic application possibilities. Practical applications of amorphous metallic glasses are in some cases limited by the thickness of the ribbon. In the present contribution as-cast and after annealing Co–Fe–B–Si–Nb ribbons (monolayer), pseudobulk (bilayer, trilayer) materials with increased thickness in comparison with ribbons (monolayer) and Co–Fe–B–Si–Nb-Ga ribbon were investigated by measurements of magnetostriction λ _s . These materials were prepared by planar flow casting method (PFC) and modified PFC method with a single crucible which has two or three nozzles for preparation of pseudobulk samples, respectively. The field dependence of the parallel [λ _par(H)] and perpendicular [λ _perp(H)] magnetostrictions in the sample plane was measured at room temperature. These dependencies were used to calculate the values of saturation magnetostriction λ _s . Microstructure of the as-cast samples as well as annealed samples was investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM).