从性能角度看刹车片的研究现状与动态

综述了刹车片的分类、发展历程和性能要求,阐明了影响其性能要求的主要因素,总结了当前各类刹车片各种性能提升的研究现状。着重分析了在确保制动性能、抗衰退性能、恢复性能良好的情况下,尽量提升舒适性能,研发绿色、经济的新材料刹车片的动态。     

碳纤维/Kevlar纤维混杂复合材料的研究进展

纤维混杂复合材料作为一种先进的复合材料,受到国内外众多研究者的青睐。介绍了纤维混杂复合材料的发展,并描述了纤维的混杂方式。着重概述了碳纤维/Kevlar纤维混杂复合材料在拉伸性能,冲击性能,压缩性能,摩擦性能,吸湿性能,阻尼性能,热性能方面的研究进展。简要探讨了纤维走向、铺层方式、混杂比等对其性能的影响。     

环氧树脂/二硫化钼纳米复合涂层的疏水及摩擦学性能研究

通过喷涂制备了环氧树脂/二硫化钼纳米复合涂层,并使用聚四氟蜡粉末改善了复合涂层的疏水性能及摩擦学性能。探讨了聚四氟蜡填料的含量对纳米复合涂层的疏水性能及摩擦学性能的影响。同时改变摩擦条件,研究复合涂层的摩擦性能。结果表明,环氧树脂/二硫化钼纳米复合涂层体现出良好的疏水性能和优异的摩擦学性能。     

物理性能对煤基抗冲共聚聚丙烯2500H注塑性能的影响

研究了煤基抗冲共聚聚丙烯2500H与石油基对比牌号聚丙烯在熔体流动速率、热氧稳定性能、结晶性能、分子量及其分布、流变性能等方面的差异,分析了差异对注塑性能造成的影响。结果表明,煤基聚丙烯2500H在热氧稳定性能和结晶性能上达到了目前国内同类产品中最高水平,流变性能也处于较好水平。因此2500H的总体注塑性能良好。     

2101耐蚀可焊船用铝合金的应用性能

本文概述了2101船用铝合金的力学性能,疲劳性能,可焊性能,耐蚀性能、复合性能,冷、热加工成型性能等应用性能。研究试验表明:该合金具有较高的母材和焊接接头强度及良好的综合性能。     

漆酚缩甲醛对氟苯胺的合成及性能研究

以对氯硝基苯、甲醛、漆酚为原料,合成了漆酚缩甲醛对氟苯胺聚合物。采用红外分光光度计对其结构进行表征,并测试其涂膜的疏水性能、耐腐蚀性能、抗紫外线性能、物理机械性能。结果表明:漆酚缩甲醛对氟苯胺聚合物与漆酚聚合物相比,具有良好的疏水性能。抗紫外线性能、耐碱性能等有了较大的提高,并保持了漆酚缩甲醛聚合物优良的理化性能。     

聚苯硫醚改性MC尼龙复合材料的制备及性能研究

采用己内酰胺作为单体,根据阴离子开环聚合的机理,按照铸型尼龙(MC)的制备方法制备了聚苯硫醚改性MC尼龙复合材料。分别考察了复合材料的弯曲性能和抗冲击性能及吸水性能。实验结果表明:聚苯硫醚在所制备MC尼龙复合材料中有较好的分散性,改善了其抗冲性能和吸水性能,但是其弯曲性能有所降低;在聚苯硫醚添加量在0.15%~0.25%时,复合材料抗冲性能最高,在0.25%时降低了其吸水性。     

石粉对水泥-矿粉混凝土性能的影响

本文主要研究了石粉对水泥-矿粉混凝土的工作性、抗压强度、耐久性能(抗渗性能、抗碳化性能和抗冻性能)的影响,并利用孔结构微观分析对其进行了机理分析。研究表明:石粉应用于水泥-矿粉混凝土中,不仅可改善混凝土的工作性能,而且可提高混凝土的抗压强度,对混凝土的耐久性能(抗渗性能、抗碳化性能和抗冻性能)影响不大。     

云平台虚拟化性能的评测与研究

阐述了虚拟化技术是云平台实现的关键技术,虚拟化性能是衡量云平台性能的重要标准。为评测与研究云平台的虚拟化性能,建立了一种云平台虚拟化性能评测模型,并对UCloud和百度开放云平台这两个云平台的虚拟机性能及其损失、虚拟资源分配和虚拟机稳定性进行了测试,并对测试结果进行了分析。结果表明,建立的评测模型可以准确地分析UCloud云平台和百度开放云平台的虚拟化性能,可以应用于其它云平台虚拟化性能的评测。     

玻璃钢包装筒结构设计及成形工艺

目的在不影响产品性能的情况下,减小产品质量,降低生产成本。方法将钢质包装筒改成玻璃钢包装筒,并进行了力学性能检测、防水性能检测和气密性能检测,并将2种包装筒的使用性能进行了对比。结果玻璃钢包装筒的表面质量、尺寸、力学性能、防水性能、气密性能等各方面性能,均满足产品使用要求。结论成功实现了用玻璃钢包装筒代替钢质包装筒的工艺技术改进,降低了产品的成本,获得了价格优势,增强了市场竞争力。     

Langmuir-Blodgett films of long-chain derivatives of ferrocene, biferrocene and oxidized ferricenium

Different orientations of ferrocene nuclei can be obtained in the Langmuir- Blodgett (LB) films of amphiphilic ferrocene and biferrocene derivatives, depending on the number of long-chain substituents. Polarization energies of ferrocene due to the molecular alignments in the LB films were estimated from UV photoelectron spectroscopy with reference to the cyclic voltammograms for the solutions. Change transfer complexes of the ferrocene derivatives with various electron accepting species such as iodine and tetracyanoquinodimethane give stable condensed monolayers and the electronic absorption spectra of these complexes were examined in the monolayers and multilayers. The BF^-₄ salts of the ferrocene and biferrocene derivatives also form stable monolayers in which the absorption band due to the oxidized ferricenium cation was observed at 610–690 nm. In addition, electrochemical oxidation and reduction for the LB films of the ferrocene derivative have been studied.     

二茂铁及其在液晶领域的合成研究评述

对二茂铁及液晶衍生物的制备、分类应用作了归纳和评述.表明它们在液晶领域以及其他方面必将拥有广阔的应用前景.     

Effects of mechanical pressure on charge transport in some ferrocene derivatives in the presence of adsorbed vapours

The change in adsorption-induced electrical conductivity of some ferrocene derivatives as a function of temperature has been studied under moderate pressures. At a constant cell temperature, the conductivity of the pure ferrocene derivatives in the dry state depends on the applied pressure and this pressure dependence of conductivity is significantly different for different materials. A spectacular change in the electrical conductivity behaviour of these materials at the vapour-adsorbed state, as a function of temperature under mechanical pressure, has been observed. Pressure-induced change in conductivity of different ferrocene derivatives at the vapour-adsorbed state is remarkably different. The results have been discussed in the light of different existing theories. The unusual variation of conductivity with temperature under pressure is thought to be due to the phase transition in these materials.     

Chemiluminescence of luminol catalyzed by electrochemically oxidized ferrocenes

Ferrocenes oxidized at an indium tin oxide-coated glass electrode catalyze the chemiluminescent reaction of luminol with hydrogen peroxide. The catalytic reaction has been studied with ferrocene derivatives in solution and covalently attached to ovalbumin adsorbed on the electrode. It is shown that chemiluminescence is initiated by electrochemical oxidation of the ferrocene derivative.     

镀Ni-P和Ni-N合金碳纳米管的磁性能及其复合材料的微波吸收性能

用竖式炉流动法,以二茂铁为催化剂,噻吩为助催化剂,苯为碳源通过催化裂解反应在1100~1200℃制备了直线形碳纳米管,外径为20~50 nm,内径10~30 nm,长度50~1000 μm。用化学镀工艺在碳纳米管表面均匀包覆了Ni-P和Ni-N合金,研究了它们的磁性能及其环氧树脂基复合材料在2~18 GHz的微波吸收性能。与纯碳纳米管相比,镀Ni-P合金碳纳米管复合材料的吸收峰向高频移动,镀Ni-P和Ni-N合金碳纳米管经热处理后,复合材料的吸收峰向低频移动。镀Ni-P合金碳纳米管以及镀Ni-P和Ni-N合金经热处理碳纳米管的矫顽力分别为304.34 Oe、 81.65 Oe、 183.85 Oe。随着矫顽力的增加,在2~18 GHz,复合材料的微波吸收峰向高频移动。在复合材料中,碳纳米管以及镀Ni-P和Ni-N合金的碳纳米管作为偶极子吸收微波。      

酚醛树脂基磁性活性炭的制备及性能研究

以酚醛树脂为原料、二茂铁作为添加剂,制备了磁性活性炭(magnetic activated carbon,MAC),并采用气体吸附、液相吸附和振动磁强仪等方法表征了活性炭的孔结构、吸附能力和磁特性.此外,对磁性活性炭制备过程中的二茂铁添加量、活化时间等主要工艺参数进行了研究和初步优化.结果表明,二茂铁对活性炭孔隙的产生...     

Capillary gel electrophoresis with sinusoidal voltammetric detection: a strategy to allow four-"color" DNA sequencing.

A novel detection strategy for DNA sequencing applications that utilizes a frequency-based electrochemical method is reported. Sinusoidal voltammetry is used to selectively identify four unique redox molecules that are covalently attached to the 5'-end of a 20-base sequencing primer. The tags used in this work are ferrocene derivatives with different substituents attached to the ferrocene ring, where the electron-donating or -withdrawing character of the substituent alters the half-wave potential of the modified ferrocene. Therefore, each tag has a unique SV frequency spectrum that can be easily identified in the frequency domain. In this work, the discrimination of one tag versus all others is accomplished through a "phase-nulling" technique. The signal for each tag is selectively eliminated while the other three responses remain virtually unchanged. This analysis scheme allows for the selective identification of each tagged oligonucleotide eluting in sieving polymer capillary gel electrophoresis with a separation efficiency of 2 x 10(6) theoretical plates per meter. This separation efficiency is sufficient to perform "low-resolution" DNA sequencing; the conditions used in this work have not yet been optimized for high-resolution sequencing applications.     

Novel fabrication of nano-pattern with optical function by selective doping of dye vapor into novolac resin

We report selective doping of vapor of yellow dye, ferrocenedimethanol into exposed (UV-irradiated) areas of novolac resin films. When vapor of the dye was contacted with micro-patterned resin films containing both exposed and unexposed areas, the dye was doped only into the exposed areas, resulting in fabrication of micro-pattern containing the dye. On the contrary, ferrocene and other ferrocene derivatives were doped both exposed and unexposed areas of the resin. A contact angle measurement of aqueous drops on each dye indicated that the chemical affinity between hydroxyl groups of ferrocenedimethanol and exposed areas of the novolac resin will enhance selective doping of the dye into the exposed areas.     

膨胀石墨复合材料的电磁特性及其3mm、8mm波动态衰减性能研究

通过高温下膨化二茂铁与可膨胀石墨混合物的方法, 制得附着铁氧化物的膨胀石墨复合材料. 铁氧化物的主要成分为Fe₂O₃、Fe₃O₄, 随着铁氧化物含量的增加, 其平均电导率呈下降趋势, 而磁化强度逐渐增强, 复合材料呈亚铁磁性. 在不影响膨胀石墨电损耗吸收的同时, 复合材料增加了磁损耗吸收, 其3mm、8mm波动态衰减效果明显优于单纯的膨胀石墨. 二茂铁和可膨胀石墨的质量比为2～3:5时, 3mm、 8mm波动态衰减能力最强.     

Beta-cyclodextrin-based ferrocene-imprinted gold electrodes

A new stepwise self-assembly procedure is described for the preparation of functional cyclodextrin-modified electrodes. The approach is based on the formation of alkanethiol/lipoylamide-beta-cyclodextrin monolayers with the thiol component responsible for blocking of the electrode surface and lipoylamide-beta-cyclodextrin molecules-for controlled opening of the access of the electroactive probe to the electrode. Functionalization of the electrode is achieved by means of a new cyclodextrin derivative-mono(6-deoxy-6-lipoylamide)-per-2,3,6-O-acetyl-beta-cyclodextrin-prepared in the peracetyl form and deacetylated directly on the electrode surface following the cyclodextrin self-assembly. The progress of deacetylation was monitored by the MALDI MS technique. Deacetylation caused opening of the active sites toward solution probes. The response toward ferrocene was found to be highly improved when ferrocene was added to the solution following self-assembly of cyclodextrin but prior to the thiol self-assembly step (imprinting method). The proposed synthesis and sequential monolayer formation scheme lead to well-organized and stable modified electrode surfaces with improved sensitivity toward solution species compared to other procedures of electrode modification with the cyclodextrin derivatives.