纳米TiO2复合铁钛防锈颜料的研制及产业化进展

介绍了纳米TiO2复合铁钛防锈颜料的制备原理、工艺、技术指标;描述了铁钛防锈涂料的配方、性能检验和产业化进展情况.     

唑系含能化合物的特征

从密度、感度、熔化分解点、焓值等方面系统地概述了唑系含能化合物的特征。     

水中痕量芳烃化合物的富集及测定

研究采用ＧＤＸ－３０１多孔微球为吸附剂，环己烷为脱附剂，富集水中痕量芳烃的条件。富集后的洗脱液直接注入２．０％ＤＮＰ－２．５％的有机皂士／１０１白色担体柱中，用ＦＩＤ检测器，恒温下进行气相色谱分离。采用单点校正法进行定量。大大提高了方法的灵敏度，已成功地应用于水中痕量芳烃化合物的测定。本法简便、快速，适用于微量、痕量杂质的富集测定。     

Nanocomposite matrix for increased fibre composite strength

A new type of three-phase thermoplastic composite has been made, consisting of a main reinforcing phase of woven glass or carbon fibres and a PA6 nanocomposite matrix. Nanocomposites have the potential to improve the matrix dominated flexural and compressive strength by increasing the matrix modulus. Good quality fibre composites have been made with several types of PA6 nanocomposite and unfilled PA6 in combination with glass and carbon fibre reinforcement. Flexural tests on commercial PA6 fibre composites have shown the decrease of the flexural strength upon increasing temperature and this has been compared with the decrease of the matrix modulus. The nanocomposites used in this research have moduli that are much higher than unfilled PA6, also above T_g and in moisture conditioned samples. The strength of glass fibre composites can be increased by more than 40% at elevated temperatures and the temperature range at which a certain minimum strength is present can be increased by 40-50 °C. Carbon fibre composites also show significant improvements at elevated temperatures, although not at room temperature. The advantage of the use of nanocomposites instead of other polymers to improve the fibre composite properties is that the properties can be improved without any change in the processing conditions.     

均分散TiO2纳米晶的制备及应用研究进展

介绍了不同晶形TiO2纳米晶的制备、应用;对TiO2纳米晶的合成方法以及相关材料的应用进展,尤其是均分散TiO2纳米晶的制备技术进行了综述。     

高性能活性炭开发生产中的无机活化剂

无机活化剂是开发生产高性能活性炭的关键原料。综述了高性能活性炭开发生产中常用的无机活化剂;介绍了H₃PO₄、KOH、ZnCl₂、CO₂、O₂和水蒸气等无机活化剂的特点和作用机理;总结提出了新型复合活化剂的设计方法及应用。建议加快开发价格低廉的新型复合活化剂;还建议将高性能活性炭生产和酚类废弃物处理结合应用,以降低高性能活性炭生产原料成本和酚类废弃物的处理成本。     

基团转移聚合反应中的有机硅引发剂

评述了近年来基团转移聚合反应中几种常用的有机硅引发剂(如单官能团引发剂、双官能团引发剂、其它乙烯酮硅烷缩醛引发剂、大分子引发剂及其它含硅引发剂)的研究进展,并展望了基团转移聚合反应在高分子合成中的重要作用及应用前景。     

新型吸-放热复合发泡剂的特性分析与应用

对自制的新型吸－放热复合发泡剂ＨＣＢ－ＮＸ的分解动力学和热力学特性进行了研究,同时对采用该发泡剂进行硬质聚氯乙烯低发泡挤出的特性及泡孔结构进行了分析。     

The effect of intermetallic hydrogen acceptor on catalytic aromatization of propane

The effect of the hydride-forming intermetallic compound Zr₂Fe on the aromatization of propane over high-silica zeolites of CVM type (Russian equivalent of ZSM-5) modified by Zn, Ga or Pt cations has been investigated. Aromatics yield and selectivity of aromatization are shown to increase essentially as a result of releasing hydrogen elimination by the intermetallic acceptor. The effect of hydrogen acceptor on propane conversion and product distribution appeared to be different depending on the composition of the catalyst used. Possible changes in the reaction mechanism in hydrogen removal conditions are discussed.     

Molecular association complex of urea with polyethylene: 3. Structural studies of the complex

The crystal structure of urea-polyethylene complex in the hexagonal form, obtained by one of our preparation methods, is analysed by X-ray power diffractometry. In this analysis, the fixed molecular parameters of urea are used, and three models with respect to rotational disorder of the guest polyethylene molecule are assumed. It is shown that the host lattice structure constructed by urea molecules is essentially the same as that of urea-n-paraffin complex. Effects of the disorder structure of the guest on X-ray scattering of the complex are presented. However, there is a difficulty in identifying the disorder structure by X-ray analysis. With the aid of a potential energy calculation between the hexagonal urea tunnel and the guest molecule, a rotational disorder model is preferred.