光机结构C4P综合设计/制造体系

结合光机结构的设计与制造,提出了C4P综合体系,对其基本组成部分做了论述,并给出一个实例的软硬件构成。最后简略叙述了C4P综合设计与制造体系的实现策略。     

氧氮化铝陶瓷的合成与应用

介绍了氧氨化铝的基本性能、合成研究的最新进展、烧结及其抗氧化性、热稳定性和应用。     

溴化—四（N—十二烷基）对烟酰基苯卟啉的合成

合成了溴化－四（Ｎ－十二烷基）对烟酰基苯卟啉（ＴＤＮＡＰＰＢｒ）及其Ｚｎ（Ⅱ）、Ｃｏ（Ⅱ）两种配合物。测定了其红外、紫外光谱。三种卟啉制成Ｌ－Ｂ膜，测定了膜的崩溃压和分子面积。     

Characterization of BaSnO3-based ceramics: Part 1. Synthesis, processing and microstructural development

The compound BaSnO₃ together with its Ca- and Sr-analogs, has recently been projected as potential electronic ceramic material (thermally stable capacitor, chemical sensor for humidity, CO and NO_x, etc.). In order to fill the information gaps in the reported research, a vigorous and systematic investigation on these exotic materials has been initiated. A thorough study of BaSnO₃ with respect to its synthesis, processing and microstructural characterization has been made. In order to establish a standard methodology for low-cost mass-manufacturing with identical and beneficial microstructure and reproducible electrical characteristics, different synthesis routes (solid-state and self-heat-sustained) were adopted. Evolution of microstructure which is intimately related to the envisaged properties in the ceramics, was closely and systematically followed in terms of sintering over a wide range of temperatures and soak time. This communication forms the first of two parts in a series of investigations on MSnO₃ systems, where results on the synthesis and processing of “phase pure” barium stannate (BaSnO₃) and development of interesting microstructure are presented.     

异辛氧基硼酸铜抗磨减摩添加剂的研究

合成了异辛氧基硼酸铜，考察了其油溶性和抗氧抗腐蚀性。采用ＭＳ－８００Ａ摩擦试验机和ＨＱ－１摩擦磨损试验机对其抗磨减摩性能进行了评价，并计算出磨损体积和磨损速率。结果表明，异辛氧基硼铜具有良好的抗磨减性能，油溶性和抗氧抗腐腐蚀性能。     

Alternating current conductivity and dielectric properties of newly prepared poly(bis thiourea sulphoxide)

Poly(bis-thiourea sulphoxide) was prepared by Michael addition mechanism of thiourea with bis-sulphinyl thiourea, which in turn, was prepared by the reaction of thiourea with thionyl chloride. The formed polymer was identified by microchemical analysis and IR spectrum. Thermogravimetric analysis shows that it is stable up to 490°K, and having thermal activation energy 11.2 K cal·mol m 1 . It is of relatively low molecular weight as found from the inherent viscosity value (0.242 dLg m 1 ). Alternating conductivity measurements at different temperatures and frequencies exhibited that the prepared polymer is a highly polarized material. The relaxation time of the orientational process is about 9 2 10 m 11 second and the activation energy of this process is 0.387 eV. The conduction mechanism could be attributed to the correlated barrier hopping (CBH) model.     

一锅法合成2-(3-乙氧基-4-正癸氧基苯胺基)亚甲基丙二酸二乙酯

以4-羟基-3-乙氧基苯胺为原料,先与乙氧亚甲叉丙二酸二酯缩合、再与溴癸烷成醚得到2-(3-乙氧基-4-正癸氧基苯胺基)亚甲基丙二酸二乙酯,总收率为89.2%。缩合反应在无溶剂条件下进行;癸烷基化反应通过加水催化,严格控制反应体系的含水量在2.0%⁵.0%,不仅可以加快反应速率,而且提高了转化率,避免了催化剂使用,是一条适合生产的新合成工艺路线。     

Synthesis,photophysical and photochemical studies of benzophenone based novel monomeric and polymeric photoinitiators

Four novel benzophenone-containing photoinitiators (monomers PI-1 and PI-2 and their polymers PPI-1 and PPI-2) were prepared from alkyl α-hydroxymethacrylates. PI-1 was synthesized from reaction of tert-butyl α-bromomethacrylate and 4-hydroxybenzophenone followed by cleavage of tert-butyl groups using trifluoroacetic acid. PI-2 was synthesized from reaction of ethyl α-bromomethacrylate and 3-benzoylbenzoic acid. Thermal polymerization of PI-1 and PI-2 was performed using 2,2′-azobis(isobutyronitrile). PI-1 and PPI-1 show UV absorption (289 and 294 nm) which are red-shifted compared to benzophenone (252 nm), PI-2 (255 nm) and PPI-2 (252 nm). All of the photoinitiators give phosphorescence emissions from their n–π* states. The photopolymerizations of triethylene glycol dimethacrylate, 2-hydroxyethyl methacrylate and hexanediol diacrylate initiated by PI-1, PI-2, PPI-1, PPI-2 and benzophenone were studied by photo-differential scanning calorimeter using N,N-dimethyl-p-toluidine as coinitiator. Polymeric photoinitiators were found to have higher efficiencies than benzophenone and monomeric ones. Photopolymerization results are also compared to that of an alkyl α-hydroxymethacrylate-based photoinitiator previously reported by us; and the influence of monomer structure on polymerization efficiency is discussed.     

Tribological Characterisation of Graphene Oxide as Lubricant Additive on Hypereutectic Al-25Si/Steel Tribopair

The performance of a lubricant greatly depends on the additives it involves. However, recently used additives produce severe pollution when they are burned and exhausted. Therefore, it is necessary to develop a new generation of green additives. Graphene oxide (GO) is considered to be environmentally friendly. The scope of this study is to explore the fundamental tribological behavior of graphene, the first existing 2D material, and evaluate its performance as a lubricant additive. The friction and wear behavior of 0.5 wt% concentrations of GO particles in ethanol and SAE20W50 engine oil on a hypereutectic Al-25Si alloy disc against steel ball was studied at 5 N load. GO as an additive reduced the wear coefficient by 60–80% with 30 Hz frequency for 120 m sliding distance. The minimum value of the coefficient of friction (0.057) was found with SAE20W50 + 0.5 wt% GO. A possible explanation for these results is that the graphene layers act as a 2D nanomaterial and form a conformal protective film on the sliding contact interfaces and easily shear off due to weak Van der Waal's forces and drastically reduce the wear. Scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and Raman spectroscopy were used for characterization of GO and wear scars.     

Empirical Kinetics Equation of the Synthesis of NTO in Nitric Acid

The influence of concentration of reactants (HNO₃ and TO) and reaction temperature on the rate of synthesis of NTO from TO in nitric acid solution was investigated by using an experimental kinetics model. An exponential kinetic equation was established by nitration of TO in 60.4–76.2 % HNO₃. Experimental data of the nitration of TO with 60.0–96.7 % HNO₃ were used to verify this model. Kinetic parameters such as apparent reaction orders of TO and HNO₃, activation energy and frequency factor for nitration of TO were determined. The values of nitration rate calculated were similar to those measured. This model can quantitatively and qualitatively describe the influence of concentration of reactants and reaction temperature on the rate of nitration TO. In addition, it was found that the kinetics model is potentially suitable for approximately predicting the rate of NTO synthesis from TO.