Porous TiC Ceramics Derived from Wood Template

A porous TiC ceramic with a woodlike structure was prepared from wood template through tetrabutyl titanate vacuum-infiltration. The tetrabutyl titanate was first decomposed to TiO₂, and then in-situ reaction between TiO₂ and carbon template took place in the cellular wall at high sintering temperature. The original structure of wood was retained. In addition, the dimensional shrinkage of the pores after the removal of the residual carbon was different according to the difference of the wood density.     

Two possible emission mechanisms involved in the arc discharge method of carbon nanotube preparation

By investigating the morphologies and microstructures of the cathode deposits prepared by self-sustained arc discharge between graphite rods, we consider that there are two electron emission mechanisms occurring on the cathode: field emission and thermionic emission. The former occurs mainly on the edge of the growing surface, by which we can explain the formation of the outer hard shell of the cathode deposit; while the latter occurs mainly on the growing surface except for the edge area and it is the main cause for the growth of carbon nanotubes.     

Binding of several heavy metal ions by polyaspartyl polymers and their application to some Chinese herbal medicines

Water‐insoluble polyaspartyl polymers were synthesized by using water as medium instead of organic medium. Taking Ca²⁺ as a reference, the binding of several heavy‐metal ions, including Pb²⁺, Cd²⁺, Hg²⁺, Cr³⁺, Cu²⁺, and Mn²⁺, by polyaspartyl polymers was studied. The experimental results revealed that polyaspartate is an excellent binding agent for the investigated heavy‐metal ions. These cation ions were bound to polyaspartate polymer by the same mechanism as Pb²⁺, which can be explained by ion exchange model. Since polyaspartate has a protein‐resembling structure that is sensitive to trace heavy metal, it was used to remove some trace heavy‐metal elements in Chinese herbal medicines. It was found that polyaspartate material was an effective agent for the removal of Pb²⁺, Cd²⁺, and Hg²⁺ ions from glycyrrhizin, angelica, and gynostemma pentaphyllum. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

辐射固化复合材料进展

与传统的热固化成型技术相比,复合材料辐射固化具有快速,高效,低成本等优点,因而成为复合材料成型技术的“热点”之一。重点介绍了紫外光和电子束这两种方式对复合材料的固化,讨论了复合材料辐射固化技术的优点,发展与应用状况,以及存在的一些问题。     

覆炭载体及镍覆炭催化剂的积炭行为研究

用恒温热重法，以正己烷脱氢反应为指示反应，研究了γ-Al2O3覆炭载体（CCA0，γ-Al2O3，Ni/Al2O3及Ni/CCA催化剂的抗结焦性能；考察了覆炭原料，覆炭量对CCA的抗结焦性能的影响及积炭温度，正己烷浓度和覆炭量对Ni/CCA催化剂的抗结焦性能的影响。结果，CCA，Ni/CCA催化剂的抗结焦性能优于γ-Al2O3，Ni/Al2O3，以环烷烃为覆炭原料得到的CCA的抗结焦性能最好。     

丙烯酸酯类聚氨酯/SiO2纳米复合材料制备及性能研究

用原位聚合法制备丙烯酸酯类聚氨酯/SiO2纳米复合材料,通过透射电子显微镜研究了纳米SiO2在基体中的分散情况,并对材料的力学性能和光学性能进行了研究。结果表明,纳米SiO2在基体中分散很好;当纳米SiO2的质量分数为1.5%时,复合材料的综合力学性能最佳,其拉伸强度、断裂伸长率和冲击强度分别为34.20MPa、56.15%和81.52kJ/m2,与纯丙烯酸酯类聚氨酯相比分别提高了52.75%、81.19%和149%;且该复合材料的透光率在80%以上。     

厦门杏林湾排涝泵站跨管线围堰设计方案探讨

针对厦门杏林湾泵站围堰需2次跨过三根市政管线的特点,结合工程区的地质条件、水文条件、围堰结构型式选择、现有施工水平等因素,对土、充灌砂、混凝土、浆砌块石、钢板桩等围堰型式进行分析,经多方案综合比选,提出了"桩基+盖板"的水上管线加固方案,不但可以有效控制管线变形,而且施工可操作性较强。     

环氧化SBS胶粘剂的研制

研究了环氧化SBS橡胶胶粘剂的合成及应用。试验结果表明环氧化SBS胶粘剂在粘接极性材料时的性能要优于SBS胶粘剂。     

感光材料内包装黑色膜的制造工艺与性能

感光材料包装膜分为内包装膜和外包装膜。本文主要介绍内包装用黑色膜的技术现状,制造工艺,包括原材料的选择,工艺技术路线及关键设备,并列举了产品主要规格与性能指标以及加工应用。