用弯曲模型推导二组元复合材料杨氏模量新公式

用弯曲模型推导了适用于悬丝耦合弯曲共振法检测金属第二组元的杨氏模量的理论公式。通过实验数据计算。结果表明在两组元h2/h1≈1时与文献[2]的计算结果几乎接近，为用悬丝耦合弯曲共振法检测各种减振材料，陶瓷材料杨氏模量提供了理论公式；同时用改进后的弯曲模型推导出了适用于纤维复合材料横向杨氏模量的预测公式。     

斜板沉降器的设计

简要叙述了流离倾斜斜板的层膜上的单个液滴的基本聚结原理。着重介绍重力沉降器的设计方法，并指出在设计过程中可能出现的错误。     

Phase holdup and liquid dispersion in gas-liquid-solid circulating fluidized beds

Axial and radial profiles of gas and solids holdups have been studied in agas-liquid-solid circulating fluidized bed at 140mm i.d..Experimental results indicate that the axialand radial profiles of gas and solids holdups are more uniform than those in a conventionalfluidized bed.Axial and radial liquid dispersion coefficients in the gas-liquid-solid circulating fluidizedbed are investigated for the first time.It is found that axial and radial liquid dispersioncoefficients increases with increaes in gas velocity and solids holdup.The liquid velocity has littleinfluence on the axial liquid dispersion coefficient,but would adversely affect the redial liquiddispersion coefficient.It can be concluded that the gas-liquid-solid circulating fluidized bed hasadvantages such as better interphase contact and lower liquid dispersion along the axial directionover the expanded bed.     

A Solder Alloy Filled Z-Axis Conductive Epoxy Adhesive

Epoxy adhesives filled with four different volume fractions of eutectic tin-bismuth solder alloy were prepared and the effect of filler content on the electrical and mechanical properties of these anisotropic electrically conductive adhesives was investigated. The results show that the adhesive containing the lowest amount of the filler alloy had the best combination of conductivity, insulation resistance and shear strength. The DSC-measurements suggested that the filler melts before the cure of the resin begins which allows the filler to wet and bond well to the conductors. This was verified by SEM/EPMA examinations. A temperature cycling test and high humidity, high temperature treatment were conducted on the best composite adhesive. The temperature variation had no effect on conductivity of the joints while humid and hot environment decreased the conductivity.     

利用废旧高分子材料制备改性石油沥青

利用废旧高分子材料、无机填料为改性剂，采用熔融共混方法制备了一系列性能优异的新型改性石油沥青，分析了改性剂类型和用量对石油改性沥青的软化点、脆化温度、针入度和延度等性能的影响。结果表明：改性石油沥青的针入度和延度稍有降低，但其软化点明显升高，脆化温度降低，拓宽了石油沥青的使用温度范围，综合性能提高。     

硅疏水改性聚胺阻垢剂的制备及其性能

用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)、1-氯辛烷对低相对分子质量聚乙烯亚胺(PEI)进行疏水接枝改性,得到了含硅疏水改性聚胺阻垢剂。通过FTIR、TG、粒径分析、Zeta电位测试等分析改性后聚胺阻垢剂的结构与性能。结果表明,改性后产物热稳定性提高、黏度增大、表面张力降低、溶液粒径增大。将改性聚胺阻垢剂用于分散铝硅酸钠颗粒,对处理前后的颗粒进行红外光谱表征,并通过对悬浮分散液进行稳定性、颗粒沉降等测试,评价聚胺阻垢剂的阻垢分散性能并初步讨论其分散机理。当m(PEI, M_w=10000)∶m(KH560)∶m(1-氯辛烷)=10∶2∶0.5,反应时间6 h,反应温度75℃时,合成的阻垢剂分散性能最佳。当结疤的质量浓度为30 g/L时,悬浮液颗粒沉降速度达到最低值0.047 cm/d,沉降速率减小程度达到94.8%,分散性显著提高。经过改性后的PEI在氧化铝工业生产中具有高效的阻垢作用,可通过在工厂进行条件优化,进一步替代传统的强酸型阻垢剂,减小管道腐蚀程度,降低能耗。     

从煤矸石制取氯化铝联产橡胶填料的研究

在实验室小试、中试装置上进行了从煤矸石制取氯化铝联产橡胶填料的研究，考察了煤矸石性质、工艺条件等对产品质量的影响，结果发现最佳工艺参数为焙烧温度６００～ｑ００℃．焙烧时间为１５～９０ｍｉｎ．焙烧温度对产品质量影响更为显著，制得结晶氯化铝产品质量达到合格品标准，填料用作橡胶制品填充剂具有较好补强与抗曲性能，其胶片的物理机械性能达到普通橡胶板标准。     

氯乙烯悬浮聚合分散体系的中试研究

通过大量试验分析了HPMC-E50和HPMC-F50在氯乙烯悬浮聚合中对PVC树脂的影响,从而确定了复合分散体系的质量分数以及分散剂的配比。结果表明,PVA和HPMC-E50复合分散体系的分散能力优于PVA和HPMC-F50复合分散体系;在悬浮聚合中,PVA和HPMC-E50复合分散体系与VCM的比例以0.05%~0.06%为宜;在PVA和HPMC-E50复合分散体系中,HPMC-E50所占比例以40%~60%为宜。     

不同分散剂对细粒高硫煤及煤系黄铁矿的选择性分散

主要研究六偏磷酸钠和腐植酸纳２种分散剂分别对细粒高硫煤、煤系黄铁矿悬浮液的分散作用，考察了分散剂用量、介质ｐＨ值对细粒煤与煤系黄铁矿选择性分散的影响。     

Resistivity and thermal reproducibility of carbon black and metallic powder filled silicone rubber heaters

Flexible heaters were prepared by extruding platinum‐catalyzed silicone rubber composites with conductive carbon black (CB) and metallic fillers. The conductor resistivity of the extruded heaters decreased in order of conductive titanium dioxide (TiO₂) > aluminum powder ≈ zinc powder > copper powder. Thermoelectric switching phenomena were investigated for the silicone rubber/CB/metallic powder systems. The positive temperature coefficient effect was dependent mainly on the CB content rather than on the content of the metallic powders. Resistivity and thermal reproducibility of the extruded heaters were also investigated by periodically applying AC voltage of 110 V. The heaters containing copper and TiO₂ powders exhibited excellent electrical reproducibility. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 95: 1122–1128, 2005