Effects of solvent and temperature on the coupling agent/epoxy resin interface

Increased wetting of the coupling agent/epoxy resin interface was observed when γ-glycidoxypropyltrimethoxysilane, polyfunctional aminosilane and γ-aminopropyltriethoxysilane were applied respectively from methyllethylketone, dimethylformamide and water on woven glass cloths which had been cleaned at 300°C. However, when factory-applied coupling agents were burnt off the woven cloths and fresh coupling agents re-applied, it was found that the nature of the factory-applied coupling agent influenced subsequent wetting. Thinner glass fibres showed a greater improvement in wetting rate than thicker fibres in those solvents identified to be good for improved wettability, irrespective of the heat-cleaning temperature.     

可循环泡沫钻井液在宝302井欠平衡井段的应用

介绍了可循环泡沫钻井液的配方，性能及在宝302井欠平衡井段中的应用情况，结果表明该体系悬浮和携岩能力强，抗高温，抗污染效果好，能够满足宝南区块深井欠平衡压力钻井的需要，且保护油气层效果好，同时，这也是国内首次将可循环泡沫钻井液成功应用于井泥岩及煤层井，拓宽了泡沫钻井液的应用范围。     

A STUDY ON ACIDITY AND CATALYTIC PROPERTY OF [B] ZSM-5 CATALYST MODIFIED WITH SILICON COMPOUND BY CHEMICAL SURFACE DEPOSITION OF LIQUID-PHASE TECHNIQUE

The boron heteroatom zeolite catalyst has been modified with silicon compound by Chemical Surface Deposition of Liquid-phase (CLD) technique and the catalytic property of the modified catalyst is studied. Meanwhile, the acidity of the modified zeolite catalysts is characterized through TPD and IR technique, and the fluid adsorption method is used to determine its pore structure. The relationship between the catalytic property of the zeolite catalyst and its pore structure, its acidity has been found. The results of toluene-ethylene alkylation reaction indicate that the selectivity of p-ethyltoluene on the modified zeolite catalyst is higher than that on the zeolite catalyst before silanizated, reaching 94.14%.     

理想收敛理论的非标准刻画

为了用非标准分析方法进一步研究拓扑空间，在扩大模型下，对理想收敛的基本理论进行了非标准刻画：设X是拓扑空间，I是X中的理想，I收敛于点x，当且仅当v(x)包含v(I)．给出了理想的极限点和聚点的非标准特征，利用极限点对闭包进行了非标准描述，并讨论了理想收敛与伴随网收敛的相互关系．     

POCV-200/31.5型液控单向阀

介绍了一种用于液压支架大流量、快速移架系统中的POCV——200／31．5型液控单向阀的工作原理和结构特点。分析了该阀的性能，并指出了其推广应用前景。     

Highly Efficient Orange and Green Solid‐State Light‐Emitting Electrochemical Cells Based on Cationic IrIII Complexes with Enhanced Steric Hindrance

Highly efficient orange and green emission from single‐layered solid‐state light‐emitting electrochemical cells based on cationic transition‐metal complexes [Ir(ppy)₂sb]PF₆ and [Ir(dFppy)₂sb]PF₆ (where ppy is 2‐phenylpyridine, dFppy is 2‐(2,4‐difluorophenyl)pyridine, and sb is 4,5‐diaza‐9,9′‐spirobifluorene) is reported. Photoluminescence measurements show highly retained quantum yields for [Ir(ppy)₂sb]PF₆ and [Ir(dFppy)₂ sb]PF₆ in neat films (compared with quantum yields of these complexes dispersed in m‐bis(N‐carbazolyl)benzene films). The spiroconfigured sb ligands effectively enhance the steric hindrance of the complexes and reduce the self‐quenching effect. The devices that use single‐layered neat films of [Ir(ppy)₂sb]PF₆ and [Ir(dFppy)₂sb]PF₆ achieve high peak external quantum efficiencies and power efficiencies of 7.1 % and 22.6 lm W^–1) at 2.5 V, and 7.1 % and 26.2 lm W^–1 at 2.8 V, respectively. These efficiencies are among the highest reported for solid‐state light‐emitting electrochemical cells, and indicate that cationic transition‐metal complexes containing ligands with good steric hindrance are excellent candidates for highly efficient solid‐state electrochemical cells.     

Piezoresistive Behavior Study on Finger‐Sensing Silicone Rubber/Graphite Nanosheet Nanocomposites

A novel finger‐sensing nanocomposite with remarkable and reversible piezoresistivity is successfully fabricated by dispersing homogeneously conductive graphite nanosheets (GNs) in a silicone rubber (SR) matrix. Because of the high aspect ratio of the graphite nanosheets, the nanocomposite displays a very low percolation threshold. The SR/GN nanocomposite with a volume fraction of conductive nanosheets closest to that for the percolation threshold presents a sharp positive‐pressure coefficient effect of the resistivity under very low pressure, namely, in the finger‐pressure range (0.3–0.7 MPa), whereby the abrupt transition could be attributed to compressive‐stress‐induced deformation of the conducting network. The super‐sensitive piezoresistive behavior of the nanocomposite is accounted for by an extension of the tunneling conduction theory which provides a good approximation to the piezoresistive effect.     

一种环氧树脂阻尼灌封胶的热氧加速老化研究

研究了某种环氧树脂阻尼灌封胶在热氧老化的作用下分子结构、硬度、断面形貌以及动态力学性能随时间的变化．傅立叶红外光谱图表明，所制备的样品环氧基团反应比较完全，热氧老化后试样表面由仲胺和环氧基团形成的酯键发生了部分断裂和氧化；邵氏硬度的增加、瓦向高温区移动则表明在老化过程中复杂的固化反应仍然继续进行；最大损耗因子（tanδmax）波动较小表明试样老化后分子结构几乎保持不变；SEM图片显示试样的冲击断裂由老化前的韧性转变为老化后的脆性断裂．     

改性生物质作为型煤黏结剂的研究

探讨了用NaOH改性生物质秸秆作为型煤黏结剂的可行性,考察了NaOH溶液浓度对生物质改性的影响以及生物质添加量、无机物(MgO和MgCl2)添加量对型煤机械强度、防水性能和着火温度的影响。研究结果表明,NaOH改性液的质量分数为1.0%~2.0%时,制得的生物质型煤有较高的机械强度;生物质添加量在2%~20%时,随生物质添加量的增加,机械强度增加,着火温度降低,但防水性较差;而在生物质型煤中加入适量无机黏结剂后,型煤有很高的浸水强度,表现出优越的防水性能。     

3Cr-3Mo二次硬化钢的回火组织和力学性能

研究了3cr—3Mo二次硬化钢淬火回火后的组织和力学性能。结果表明：随回火温度的升高，试验钢中先后析出M3c、M2c和M7C3等碳化物，在575℃回火时硬度达到峰值；400一575℃回火后试验钢的抗拉强度约为l600MPa，冲击韧性为30J／cm^2；回火温度高于600℃时，强度和硬度迅速下降，冲击韧性增加；640℃回火时，以M2C型碳化物为主，抗拉强度为1100MPa，冲击韧性增加至55J／cm^2。