聚己二酸1,2-环己二醇酯的合成

采用正交实验方法,分别以钛酸四丁酯和对甲苯磺酸为催化剂,合成了聚己二酸1,2 环己二醇酯,对其合成工艺条件进行了研究,得出了最佳工艺条件。并以所得聚酯合成了具有透明度高、硬度大、耐磨、玻璃化温度高等优异性能的聚氨酯材料。     

高分子和盐对3-十二烷氧基-2-羟丙基三甲基溴化铵泡沫性能的影响

测定了3-十二烷氧基-2-羟丙基三甲基溴化铵(C12TAB)在PVP、PEG和溴化钠存在下的泡沫性能。结果表明：含量相同时，C12TAB／NaBr混合体系的起泡性能高于C12TAB／高分子体系，而稳泡性能低于后者。含量相同的C12TAB／高分子体系，PVP对C12TAB的影响好于PEG。     

毛细管气相色谱法分析2-氯-4-溴苯酚

用毛细管气相色谱，FID检测器．双内标法定量，分离测定了2-氯-4-溴苯酚及其主要杂质邻氯苯酚、2-氯-5-溴苯酚和2-氯-4，4-双溴苯酚的含量。其相对标准偏差为0．19，0．014，0．016，0，020，变异系数分别为0．19％．4．71％．1．84％．2．05％。     

Electrooxidation of acetaldehyde on carbon-supported Pt, PtRu and Pt3Sn and unsupported PtRu0.2 catalysts: A quantitative DEMS study

The oxidation of acetaldehyde on carbon supported Pt/Vulcan, PtRu/Vulcan and Pt₃Sn/Vulcan nanoparticle catalysts and, for comparison, on polycrystalline Pt and on an unsupported PtRu_0.2 catalyst, was investigated under continuous reaction and continuous electrolyte flow conditions, employing electrochemical and quantitative differential electrochemical mass spectroscopy (DEMS) measurements. Product distribution and the effects of reaction potential and reactant concentration were investigated by potentiodynamic and potentiostatic measurements. Reaction transients, following both the Faradaic current as well as the CO₂ related mass spectrometric intensity, revealed a very small current efficiency for CO₂ formation of a few percent for 0.1 m acetaldehyde bulk oxidation under steady-state conditions on all three catalysts, the dominant oxidation product being acetic acid. Pt alloy catalysts showed a higher activity than Pt/Vulcan at lower potential (0.51 V), but do not lead to a better selectivity for complete oxidation to CO₂. C–C bond breaking is rate limiting for complete oxidation at potentials with significant oxidation rates for all three catalysts. The data agree with a parallel pathway reaction mechanism, with formation and subsequent oxidation of CO_ad and CH _{x, ad} species in the one pathway and partial oxidation to acetic acid in the other pathway, with the latter pathway being, by far, dominant under present reaction conditions.     

用2-甲基吲哚作偶合剂测定克仑特罗片

试验了用2-甲基吲哚测定克仑特罗片的新方法。克仑特罗在酸性溶液中被亚硝酸钠重氮化后,能与2-甲基吲哚偶合成黄色化合物,该化合物的最大吸收波长λmax389nm,摩尔吸光系数ε为2.36×104L.mol-1.cm-1,该法线性范围0~24mg/L,最低检测限为0.14mg/L,有色化合物至少稳定2h,此法适用于药品生产中的质量监控。     

光活性二氧化钛涂层的研究与制备

本文介绍了制备光活性TiO2涂层的两种主要方法，并就一些影响因素进行了简单的讨论。     

微波辐射下一步合成2-甲氧基-3-氰基-4-芳基吡啶和2-氨基-3-氰基-4-芳基吡喃衍生物

2，5－双亚苄基环戊酮与丙二腈在氢氧化钠－甲醇或哌啶－乙醇中，经微波辐射一步合成了2－甲氧基－3－氰基－4－芳基吡啶和2－氨基－3－氰基－4－芳基吡喃衍生物，反应在3－9mi内完成，产率56％－78％。     

固体酸催化剂作用下氯苯硝化的区域选择性研究

制备了SO^2-4/ZrO2催化剂并研究了该催化剂作用下硝酸硝化氯苯的区域选择性，反应具有强对位选择性硝化能力，催化剂经500℃焙烧后，在反应温度为30℃和反应30min时，氯苯一硝化产物中邻／对硝基氯苯异构体的质量比达0．23，产物得率可达55．5％，催化剂重复使用4次，其催化活性减少不大。     

2,2′-oxo-1,1′-azobenzene: microbial transformation of rye (Secale cereale L.) allelochemical in field soils byAcinetobacter calcoaceticus: III

Acinetobacter calcoaceticus, a gram-negative bacterium isolated from field soil, was found to be responsible for the biotransformation of 2(3H)-benzoxazolinone (BOA) to 2,2-oxo-1,1-azobenzene (AZOB). Experiments were conducted to evaluate the transformation of BOA to AZOB by this microbe in sterile and nonsterile soil. Transformation studies with soils inoculated withA. calcoaceticus indicated that the production of AZOB increased linearly with the concentration of BOA in sterile soil and showed a quadratic trend in nonsterile soils. This also indicated that all soil types studied for the transformation experiments might containA. calcoaceticus capable of the conversion of benzoxazolinones.     

Alkylation of aldehydes with methanol over titanium oxide catalysts

The methylation of various aldehydes, such as acetaldehyde, propionaldehyde, and phenylacetaldehyde over titanium oxidesupported vanadium oxide was studied under atmospheric pressure and temperatures of 250–400°C. The catalyst properties of titanium oxide can be enhanced only by addition of a fairly small amount of vanadium. High-temperature treatment transforms titanium oxide, the support, from anatase to rutile, which causes the catalysts to lose their catalytic properties. The reactivity of these can be ranked in the following order: acetaldehyde > propionaldehyde > phenylacetaldehyde. The steric effect of the substituted groups in propionaldehyde or phenylacetaldehyde may prevent self-condensation to form oligomers and to give a high selectivity of alkylated products.