松香基聚酰胺在各向同性导电胶中的应用

以马来海松酸酐、二乙烯三胺为原料,合成了松香基聚酰胺,并以其为固化剂,以环氧树脂618为导电胶基体,Ag包Cu粉为导电胶填料,KH560、聚乙二醇(200)为促进剂,制备了Ag包Cu粉导电胶,讨论了各因素对导电胶剪切强度、导电性能的影响,并测定了导电胶的玻璃化温度及耐热性能.结果表明,环氧树脂与松香基聚酰胺在固化质量比...     

十二胺对磁铁矿和绿泥石的捕收作用

矿物可浮性研究和电动电位测定试验表明:只有当介质pH值大于磁铁矿和绿泥石的PZC时,十二胺才能有效捕收上述矿物;十二胺与磁铁矿和绿泥石的作用以物理吸附为主;六偏磷酸钠与磁铁矿和绿泥石之间存在着很强的化学作用,它的存在可明显地改变磁铁矿和绿泥石的电动电位并强烈抑制其上浮。     

自熔性铸造型焦的研制

介绍了研制自熔性铸造型焦所采用的原料及制备工艺。用自熔性铸造型焦在3～5t/h工业冲天炉上进行的熔炼试验结果表明:这种型焦具有较明显的抑制铁水增硫的效果;对铁水的球化,提高球墨铸铁的内在性能十分有利;同时可减少炉壁的侵蚀,节约修炉材料,并可省去往炉内加石灰石这一操作过程和设备。     

环烷酸在水溶液中型体分布的研究

在本论文的实验中，利用强酸滴定混合碱法获得了环烷酸钾的滴定曲线，并据此确定环烷酸是一元弱酸；通过同环烷酸分子量测定结果比较得知，在水溶液中环烷酸是以单分子形式存在的；作者在对上述实验结果进行理论分析的基础上，推得了环烷酸的在水溶液中的离解常数和型体分布规律。     

梓油合成C21二羧酸二缩水甘油酯型环氧树脂的研究

以梓油为原料，合成了具有粘度低、柔韧性好等特性的Ｃ２１二官能度环氧树脂，探讨了合成反应规律，并对产品性能进行了分析。     

适用高压大容量领域的MMC-UPFC应用可靠性分析

统一潮流控制器(UPFC)是一种高度可控的灵活交流输电装置。针对适用于高压大容量输电领域的双回基于模块化多电平换流器(MMC)的UPFC(简称MMC-UPFC),考虑其备用结构和运行保护原则,并将站外交流系统转化为MMC-UPFC子系统,以传统九状态UPFC可靠性模型为基础,建立改进的双回MMCUPFC七状态可靠性模型。建立MMC-UPFC的节点注入功率模型,并基于该模型将含UPFC的最优负荷削减模型应用到合肥南部电网实例中,验证了MMC-UPFC各运行状态对系统可靠性的改善能力,并进一步研究了MMC-UPFC安装位置对可靠性改善能力的影响。     

Synthesis of γ-alumina via precipitation in ethanol

Nanosized γ-alumina powder was prepared via sol-gel precipitation in ethanol followed by a washing-drying treatment and calcination. The reactant concentration, the molar ratio of reactants and the calcination temperature were inspected by homogenous design. BET, TEM, XRD and IR were used to characterize the products. The experimental results showed that ethanol can avoid hard agglomerate during precipitation and that calcination temperature was the major factor to determine the surface area, the diameter and the phase composition of the final product. When the calcination temperatures were controlled between 686-1029 °C, the agglomerate-free nano-sized γ-alumina particles with a size range of 5-9 nm were obtained.     

离子液体催化氧化2,3,6-三甲基苯酚合成2,3,5-三甲基苯醌

研究了离子液体作为助催化剂催化氧化2,3,6-三甲基苯酚合成2,3,5-三甲基苯醌的反应。催化剂CuCl₂和MnCl₂的用量分别为2,3,6-三甲基苯酚物质的量的10%,助催化剂离子液体1-丁基-3-甲基咪唑四氟硼酸盐用量为2,3,6-三甲基苯酚物质的量的20%,空气中的氧气为氧化剂, 80 ℃反应4 h,转化率100%,选择性92.60%。在后处理过程中,离子液体易于分离和回收利用,为工业合成2,3,5-三甲基苯醌提供了一种较好的选择。     

Fabrication of Polymer Film with Extraordinary Conductive Anisotropy by Forming Parallel Conductive Vorticity‐Aligned Stripes and Its Formation Mechanism

In this work, anisotropic conductive film (ACF) is fabricated by shear‐flow induced assembly. It is found that an appropriate content of carbonaceous filler is needed for forming well‐ordered parallel vorticity‐aligned stripes and the content depends on the category of the filler. Interestingly, the lowest aspect ratio carbon black (CB) with lowest electrical conductivity is the best candidate for fabricating ACF. The film with CB stripes shows excellent conductive anisotropy: the electrical resistivity in the direction parallel to the CB stripes is almost eight orders of magnitude lower than that in the perpendicular direction. The formation mechanism of the vorticity‐aligned stripe is also investigated by the rheological measurement and the study of morphological evolution. It is found that the coalescence of dispersed phase or aggregates dominates the formation and growth of the stripe and negative value of the first normal stress difference drives the stripe to align along the vorticity direction.

     

波浪腹板门式刚架侧向变形计算研究

为补充完善波浪腹板门式刚架侧向变形的空白,基于波浪腹板工形构件的受力特性,提出了适用于计算波浪腹板工形构件变形的两种梁单元有限元简化模型,通过与壳单元对比及模型参数敏感性分析,验证了梁单元简化模型的准确性和可靠性。此外,通过理论推导和有限元计算,提出了适用于单跨等截面、单跨变截面及多跨波浪腹板门式刚架侧向变形的计算方法;其中考虑了柱脚边界条件、斜梁坡度、侧向荷载作用点和分布形式等诸多因素的影响。