硅溶胶结合浇注料的流变性能研究

对高纯硅溶胶电熔莫来石细粉泥浆的流变性能研究表明：这种泥浆是存在触变结构的高浓度胶溶悬浮体系，在受较低剪切力作用时产生的是粘滞流动，总的表现符合Ｂｉｎｇｈａｍ流变方程。研究还表明：少量超细粉的加入不改变泥浆的流变模型，但能有效地改善其流变性能，不同的超细粉影响力不同，且这种改善作用有一最佳加入量（活性ＳｉＯ２超细粉影响力大于活性Ａｌ２Ｏ３微粉，其最佳加入量分别为２％和１０％），超过这一加入量将导致流变常数上升，使其流变性恶化。     

溶胶—凝胶法制备SiO2膜的研究

研究了正硅酸乙酯和硅溶胶水解聚合过程中溶胶聚合物分子的生长过程。用ＴＥＯＳ和硅溶胶作原料。用溶胶－凝胶法制备了有载体和无体体的ＳｉＯ２膜，由不同原料引起的聚合物分子的不同生长模式将引起无载体ＳｉＯ２膜孔径的较大差异，用ＴＥＯＳ制得的无载体ＳｉＯ２膜无１．７ｎｍ以上的孔，而用硅溶胶制得的ＳｉＯ２膜平均孔径为７．５ｎｍ且孔径分布狭窄。用ＴＥＯＳ作原料可在载体α－Ａｌ２Ｏ３上制得无大孔缺陷厚约０．８μｍ     

溶胶－凝胶法制备SiO_2膜的研究

研究了正硅酸乙酯（ＴＥＯＳ）和硅溶胶水解聚合过程中溶胶聚合物分子的生长过程。用ＴＥＯＳ和硅溶胶作原料，用溶胶－凝胶法制备了有载体和无载体的ＳｉＯ＿２膜。由不同原料引起的聚合物分子的不同生长模式将引起无载体ＳｉＯ＿２膜孔径的较大差异。用ＴＥＯＳ制得的无载体ＳｉＯ＿２膜无１．７ｎｍ以上的孔，而用硅溶胶制得的ＳｉＯ＿２膜平均孔径为７．５ｎｍ，且孔径分布狭窄。用ＴＥＯＳ作原料可在载体α－Ａｌ＿２Ｏ＿３上制得无大孔缺陷厚约０．８μｍ的ＳｉＯ＿２膜，膜的纯氮气渗透表现出Ｋｎｕｄｓｅｎ扩散特征。制膜时涂膜－干燥循环不少于三次才可避免产生大孔缺陷。     

CALIXE［4］ARENE AS A TEMPLATE FOR CONTROLLING REGIOCHEMISTRY OF PHOTODIMERIZATION OF 9－SUBSTITUTED AN

ＣＡＬＩＸＥ［４］ＡＲＥＮＥＡＳＡＴＥＭＰＬＡＴＥＦＯＲＣＯＮＴＲＯＬＬＩＮＧＲＥＧＩＯＣＨＥＭＩＳＴＲＹＯＦＰＨＯＴＯＤＩＭＥＲＩＺＡＴＩＯＮＯＦ９－ＳＵＢＳＴＩＴＵＴＥＤＡＮＴＨＲＡＣＥＮＥＬＩＹＩ；ＴＯＮＧＺＨＥＮ－ＨＥ（ＣＨＥＮ－ＨＯＴＵＮＧ...     

模糊综合评判模型在高新技术企业评价中的应用

模糊综合评判模型在高新技术企业评价中的应用徐杰，刘光富ＡＰＰＬＩＣＡＴＩＯＮＯＦＭＯＤＥＬＷＩＴＨＦＵＺＺＹＳＹＮＴＨＥＴＩＣＡＬＪＵＤＧＥＩＮＶＡＬＵＡＴＩＯＮＯＦＨＩＧＨ－ＮＥＷＥＮＴＥＲＰＲＩＳＥＳ高新技术企业做为经济生活中一支新生力量，在各级...     

聚酯流变性能的研究

使用Ｉｎｓｔｒｏｎ３２１０型毛细管流变仪在２７０～２９５℃和切变速率为６０～１．８×１０５秒－１条件下，测定４种进口牌号ＰＥＴ树脂和上海石化总厂涤纶一厂ＰＥＴ树脂的流变性能．ＰＥＴ树脂在２７０～２９５℃的粘流活化能为４１．９～５８．７ｋＪ／ｍｏｌ，研究了不同牌号ＰＥＴ的熔体粘度与重均分子量的关系，还研究了阳离子染料可染改性聚酯（ＣＤＰＥＴ）的流变性能，探明了ＣＤＰＥＴ中第三单体──ＳＰＰＭ和ＤＥＧ含量对ＣＤＰＥＴ流变性能的影响．为确定上述ＰＥＴ树脂的纺丝工艺条件提供必要的流变性能数据．     

亚磷酸酯在聚丙烯中的热氧稳定作用

通过聚丙烯树脂中工稳定性及聚丙烯薄片烘箱老化试验，比较了烷基亚磷酸酯ＷＥＳＴＯＮ６１９与芳基亚磷酸酯ＩＲＧＡＴＯＳ１６８对ＰＰ热氧稳定性作用的影响，结果表明：在与酚类抗氧剂１０１０并用时，ＷＥＳＴＯＮ６１９对ＰＰ的长期热氧稳定性有明显的协同效应，而ＩＲＧＡＴＯＳ１６８则可有效地抑制ＰＰ的热氧降解。     

乙二醇生产废水水质分析研究

通过乙二醇废水进行了定量分析了研究，确定了废水中主要污染组分及其含量，分析了废水中ＣＯＤ、ＢＯＤ与ＴＯＣ及ＭＥＧ、ＤＥＧ间的相互关系，提出了一新的废水中乙二醇、二乙二醇的分析方法。     

Y－TYPE ZEOLITES AS MICRO－REACTORS FOR PHOTOCHEMICAL PREPARATION OF LARGE－RING COMPOUNDS

Ｙ－ＴＹＰＥＺＥＯＬＩＴＥＳＡＳＭＩＣＲＯ－ＲＥＡＣＴＯＲＳＦＯＲＰＨＯＴＯＣＨＥＭＩＣＡＬＰＲＥＰＡＲＡＴＩＯＮＯＦＬＡＲＧＥ－ＲＩＮＧＣＯＭＰＯＵＮＤＳ￥ＴＯＮＧＺｈｅｎｈｅ；（ＴＵＮＧＣｈｅｎｈｏ）；ＷＵＬｉｚｈｕ（ＩｎｓｔｉｔｕｔｅｏｆＰｈｏ...     

溶胶—凝胶法合成了BaAl2Si2O8超细粉末的研究

以Ｂａ（ＯＨ）２．８Ｈ２Ｏ，Ａｌ（ＮＯ３）３．９Ｈ２Ｏ，ＴＥＯＳ为原料，采用溶胶－凝胶法制备ＢａＯ－Ａｌ２Ｏ３－ＳｉＯ２三元系粉末，研究了不同因素对生成稳定溶胶和胶化时间的影响，用ＴＧ－ＤＴＡ，ＸＲＤ研究了溶胶－凝胶的热处理过程，用ＴＥＭ观察了粉体的粒径。     

Effect of sub-micron silica fillers on the mechanical performances of epoxy-based composites

Solid state thermo-mechanical properties, as well as low and large strain mechanical behaviour, of epoxy composites filled with sub-micron pyrogenic silica are discussed in this paper. The reinforcement mechanisms involved are investigated. Two distinct series of pyrogenic silica were used: hydrophilic silica with various specific surface areas and silica grafted with various organo-modifications. Furthermore, two series of networks, having either a high or low crosslink density, and resulting thus either in glassy or rubbery materials at room temperature, were considered. Dynamic mechanical analysis, uniaxial tensile tests and fracture mechanic tests were performed.All our results showed that pyrogenic silica leads to an improvement of network mechanical properties both in the glassy and rubbery states. The simultaneous increase of stiffness and toughness was observed, demonstrating the great potential of pyrogenic silica for the reinforcement of thermosetting systems. This exceptional behaviour has been interpreted in terms of the interactions and morphology developed.     

国产JQS-1硅胶聚乙烯催化剂的工业应用

研究了国产JQS-1硅胶催化剂在聚乙烯UNIPOL工艺中的应用。硅胶作为UNIPOL工艺催化剂的载体,目前一直由国外生产。通过研究国产JQS-1硅胶的基本性质、以其为载体的催化剂的组成以及使用该催化剂的基本生产状况和产品质量等情况,并与同种情况下进口硅胶Grace955做比较。得出结论:在聚乙烯UNIPOL工艺中,国产JQS-1硅胶催化剂完全可以替代进口Grace955硅胶催化剂。     

白炭黑/SSBR液相混炼研究

通过液相混炼法制备了白炭黑/SSBR复合材料,研究了不同的混炼工艺、偶联剂种类、SSBR胶液浓度对复合材料的影响。结果表明:使用两步共混法可以明显减少白炭黑的损失,且可改善白炭黑/SSBR复合材料的性能;使用Si747制备得到的SSBR/白炭黑复合材料其交联密度较大,300%定伸最高,综合性能最好;改变SSBR胶液的浓度,白炭黑/SSBR复合材料的性能无明显的变化。     

Effects of densified silica fume on microstructure and compressive strength of blended cement pastes

Some experimental investigations on the microstructure and compressive strength development of silica fume blended cement pastes are presented in this paper. The silica fume replacement varies from 0% to 20% by weight and the water/binder ratio (w/b) is 0.4. The pore structure by mercury intrusion porosimetry (MIP), the micromorphology by scanning electron microscopy (SEM) and the compressive strength at 3, 7, 14, 28, 56 and 90 days have been studied. The test results indicate that the improvements on both microstructure and mechanical properties of hardened cement pastes by silica fume replacement are not effective due to the agglomeration of silica fume particles. The unreacted silica fume remained in cement pastes, the threshold diameter was not reduced and the increase in compressive strength was insignificant up to 28 days. It is suggested that the proper measures should be taken to disperse silica fume agglomeration to make it more effective on improving the properties of materials.     

白炭黑/炭黑复合填充对NR性能的影响

在白炭黑和炭黑填料总量一定的情况下,研究了不同白炭黑/炭黑配比对NR性能的影响。结果表明,白炭黑用量增加,NR硫化速率下降,体系中炭黑填料网络被破坏且白炭黑-橡胶间较弱的相互作用也会对NR硫化胶力学性能产生一系列影响。DMA结果表明,加入20~25份白炭黑对提高硫化胶的抗湿滑性和降低滚动阻力最为有效。     

提高焦炉硅砖质量的途径

用X射线衍射仪、偏光显微镜及扫描电子显微镜对焦炉硅砖进行了分析研究。结果表明：原料和矿化剂不同，其显微结构及制品的残余石英和鳞石英的含量不同，而这些差异与制品的物理性能有直接关系，因此要提高焦炉硅砖的物理性能就必须严格控制相组成和微观结构。建议焦炉硅砖的标准中列入残余石英的允许含量及鳞石英的最低含量。     

Effects of silica sol on ion exchange membranes: Electrochemical characterization of anion exchange membranes in electrodialysis of silica sol containing-solutions

The fouling potential of the negatively charged silica sol in electrodialysis (ED) by adsorption on the surface of an anion exchange membrane was investigated. Since the fouling potential is related to the physical and electrochemical properties of the silica sol and anion exchange membranes, it is important to characterize the properties of silica sol and membranes. The surface charge of silica sol was investigated by the electrophoretic mobility and its isoelectric point was determined as pH 3. The commercial anion exchange membranes were characterized in terms of exchange capacity, water content, the zeta potential and the electrochemical properties of the membranes using impedance spectroscopy to predict the effects on the electrodialysis performances. Among the characterized properties, exchange capacity and some electrochemical properties of the anion exchange membranes were rather improved after ED experiments. In the electrodialysis of solution containing silica sol, deposition of the silica sol did not decrease the desalting performance of the anion exchange membranes because of loosely packed cake layer on the membrane surface.     

Cure Characteristics and Mechanical Properties of HRH Bonded Nylon-6 Short Fiber-Nanosilica-Acrylonitrile Butadiene Rubber Hybrid Composite

Nano silica was synthesized by acid hydrolysis of sodium silicate using diluted hydrochloric acid. This synthetic nanosilica was used in place of hydrated silica in a HRH (hexamethylenetetramine, resorcinol and silica) bonding system for acrylonitrile butadiene rubber–nylon-6 short fiber composite. Nanosilica was also used as a reinforcing filler in acrylonitrile butadiene rubber–nylon-6 short fiber hybrid composite. Cure characteristic and mechanical properties of the hybrid composites were evaluated. Minimum torque, maximum torque, and cure time of the hybrid composites increased with silica loading. Cure rate increased with fiber loading and decreased with silica content. Scorch time also decreased with fiber loading and silica content. Volume fraction of rubber in a solvent-swollen sample increased with nanosilica. The efficiency of the HRH dry bonding system was improved in the presence of nanosilica. Nanosilica in the rubber composites also improved the tensile strength, modulus, and tear strength better than the conventional silica composites. Abrasion loss, hardness, resilience, and compression set properties were also better for the nano silica composites. The composites showed anisotropy in mechanical properties.     

Preparation of silica aerogel from oil shale ash by fluidized bed drying

The silica aerogel with high specific surface area and large pore volume was successfully synthesized using oil shale ash (OSA) via ambient pressure drying. The oil shale ash was burned and leached by sulfuric acid solution, and then was extracted using sodium hydroxide solution to produce a sodium silicate solution. The solution was neutralized with sulfuric acid solution to form a silica gel. After washing with water, the solvent exchange with n-hexane, and the surface modification with hexamethyldisilazane (HMDZ), the aged gel was dried by fluidization technique and also using a furnace to yield silica aerogels. The physical and textural properties of the resultant silica aerogels were investigated and discussed. The results have been compared with silica aerogel powders dried in a furnace. From the results, it is clear that the properties of silica powders obtained in fluidized bed are superior to that of powders dried in the furnace. Using fluidization technique, it could produce silica aerogel powders with low tapping density of 0.0775 g/cm³, high specific surface area (789 m²/g) and cumulative pore volume of 2.77 cm³/g.