三核钻羰基硫簇合物与P(SR)Cl_2和P(SR)_3取代物的合成及表征

用π－酸配体Ｐ（ＳＲ）Ｃｌ＿２和Ｐ〔ＳＲ）＿３（Ｒ＝Ｅｔ，Ｐｈ）与三核钴羰基硫簇合物Ｃｏ＿３（ＣＯ）＿７（３－Ｓ）（－ＳＣＮＣＨ＿２ＣＨ＿２Ｓ）在无水无氧条件下反应，得到４个一取代产物。根据产物的元素分析结果、ＩＲ和￣１ＨＮＭＲ谱以及与已知结构的三核钴羰基硫簇合物的比较，确认产物为Ｐ（ＳＲ）Ｃｌ＿２及Ｐ（ＳＲ）＿３取代了非桥基配位钴原子上的一个羰基而得到的一取代物。     

β－C_2S固溶体稳定的热力学研究

从热力学理论出发，利用Ｘ射线衍射定性和定量的方法，对β－Ｃ＿２Ｓ固溶体的稳定性进行了分析和研究。经热力学理论推导得出β－Ｃ＿２Ｓ稳定的热力学条件，即掺入的微量元素的化学位μ＿ｉ须小于β－Ｃ＿２Ｓ的反应自由焓△Ｇ＿β，μ＿ｉ＜△Ｇ＿β．并定量地计算出一种微量元素稳定β－Ｃ＿２Ｓ的临界掺加量为；多种微量元素对β－Ｃ＿２Ｓ的稳定性判断条件为：     

苯基三甲氧基硅烷制备工艺

由苯基三氯硅烷（ＰｈＳｉＣｌ＿３）和甲醇（ＣＨ＿３ＯＨ）醇解制备苯基三甲氧基硅烷［ＰｈＳｉ（ＯＣＨ＿３）＿３〕过程中，采取及时驱除氯化氢（ＨＣｌ）的方法，控制副反应发生，可提高ＰｈＳｉ（ＯＣＨ＿３）＿３的质量，收率达８０％以上。     

酒石酸钛(IV)配合物的合成和热性质研究

通过四氯化钛与酒石酸反应，制得了新的固态配合物Ｔｉ２Ｏ２（ＯＨ）２Ｃ４Ｈ４Ｏ６·３Ｈ２Ｏ。用元素分析、Ｘ－射线粉末衍射，ＩＲ和ＴＧ分析确定了产物的组成。ＴＧ和ＤＳＣ研究了它在空气氛围下的热分解特性，计算机求解热分解反应各阶段的活化能Ｅａ，反应级数ｎ、焓变面△ｒＨ和熵变面△ｒＳ。在５５０℃灼烧１小时，可得锐钛型ＴｉＯ２。     

Al_2（OH）_5Cl的制造

Ａｌ＿２（ＯＨ）＿５Ｃｌ的制造含铝原料用盐酸在２０～９５℃下处理，控制一定条件可得到Ａｌ＿２（ＯＨ）＿５Ｃｌ沉淀。用偏高岭土（Ａｌ＿２Ｏ＿３、２ＳｉＯ＿２、２Ｈ＿２Ｏ）煅烧后的硅酸铝时作原料时，其生产成本较低。（郦东浩）Al_2（OH）_5Cl的制造@郦东浩...     

具有生物活性的含硅有机锡化合物研究

作者合成了一系列含硅有机锡化合物，对其结构进行了表征。化台物的生物选择性主要取决于硅原子上的取代基（Ｍｅ和／或Ｐｈ）．生物活性实验表明其规律为：（Ｍｅ＿３ＳｏＣＨ＿２）＿３ＳｎＹ＞（ＰｈＭｅ＿２ＳｉＣＨ＿２）＿３ＳｎＹ＞＞（Ｐｈ＿２ＭｅＳｉＣＨ＿２）＿３ＳｎＹ并且不受阴离子Ｙ的影响。     

氟化钙与硫酸在393．15K和553．15K时的焓变，自由能变与熵变值

对ＣａＦ２（ｃ）＋Ｈ２ＳＯ４（１）＝２ＨＦ（ｇ）＋ＣａＳＯ４（ｃ）反应在３９３．１５Ｋ（１２０℃）及５５３．１５Ｋ（２８０℃）时的焓变值、自由能变值及熵变值，进行了详细计算，得到了良好的结果。     

应用DSC测量HDPE熔体的热性能参数Ⅱ.熔点与比热

应用差示扫描量热法（ＤＳＣ）测量了几种高密度聚乙烯（ＨＤＰＥ）的熔点和热容变化，进而考察了试样的比热及其影响因素。     

用溶剂化金属原子浸渍法制备的高分散负载型催化剂Pd－Cu／C的结构与性质

应用溶剂化金属原子浸渍（ＳＭＡＩ）法制备了三种金属含量比不同的Ｐｄ－Ｃｕ／Ｃ双金属催化剂。经ＸＲＤ和ＴＥＭ测定结果表明，催化剂中Ｐｄ和Ｃｕ已形成合金，合金颗粒平均直径小于５ｎｍ。ＸＰＳ和Ａｕｇｅｒ谱说明Ｐｄ和Ｃｕ均以零价态存在。在亚异丙基丙酮（ＣＨ＿３）＿２Ｃ＝ＣＨＣＯＣＨ＿３加氢反应中，随着催化剂中Ｃｕ比例增加，催化活性增大，而生成六碳酮的选择性基本不变。     

氯化钙溶液的精制方法

氯化钙溶液的精制方法ＳＵ１６４８９０２本发明属于除去铁分，未完全氧化的硫化物，硫酸盐等杂质的氯化钙溶液精制方法，并且在化学工业中可以得到应用，尤其是可用于试剂用的钙化合物（ＣａＣＯ＿３、ＣａＯ、Ｃａ（ＯＨ）＿２、Ｃａ（ＮＯ＿３）＿２·４Ｈ＿２Ｏ等）合...     

氢气纯度分析方法准确性的探讨

ONACCURACYOFANALYSISOFOFHYDROGEN1前言我公司目前应用的氢气纯度分析方法有两种,一种是爆炸反应法,另一种是焦性没食子酸吸收法。几年来,人们对两种分析方法的准确性曾有过褒贬不一的评论。这里我们也谈谈自己粗浅的观点。2爆炸法测定氢气纯度一定量的氢气样品与适量的空气之均匀混合物因反应后生成液体水而引起气体体积减少,减少的体积等于参加反应气体体积之和。其中l／3为氧气,2／3为氢气。根据氢气取样量和反应前后混气体体积之差,以及氢气在反应中的体积比例关系,可计算出样品的氢气纯度。计算公式式中：A一混…     

COMPARISON OF METHODS OF ANALYSIS OF GYPSUM1

The different analytical methods proposed for the evaluation of gypsum have been subjected to an experimental test. A combination method, consisting of a fusion with KHCO₃ and determination of CaO by KMnO₄ titration, the SO₃ by Andrews method of titration of BaCrO₄ has been found to give very reliable results with the least consumption of time.     

SEDIMENTATION OF BINARY MIXTURES OF PARTICLES OF UNEQUAL DENSITIES AND OF DIFFERENT SIZES

A model is developed for the sedimentation from a suspension of two particle species of unequal densities and of different sizes. The composition and the thickness of various layers in the sediments are predicted using graphical and analytical methods. The model predictions were in excellent agreement with experimental results, when the particle size ratio was ≥ 108. When size ratio of the particles was 2.60 and 4.31 the agreement occurred in about 50 percent of the cases.     

HEASUREHENT OF INSTANTANEOUS RATES OF LOSS OF VOIATILE COMPOUNDS DURING DRYING OF DROPS

A novel technique serves to monitor instantaneous rates of loss of a volatile solute from a suspended drop during drying. A highly sensitive electron capture detector is used to monitor concentrations of SF6 released into a flowing gas stream from a suspended, drying drop. Simultaneously, the appearance and morphological development of the drop are monitored with a video camera. This provides the wherewithal of relating instantaneous rates of loss of the volatile solute to particular events during the development of particle morphology.

Initial experiments have been carried out with drops of aqueous solutions of glucose, sucrose, maltodextrin and coffee extract. The results clearly display the onset of the volatiles-retentive selective diffusion phenomenon. There is also substantial loss of the volatile component later in the drying process, when the drops undergo repeated ex ansion, bursting and cratering due to the formation of internaf bubbles. These experiments appear to be the first quantitative demonstration of major losses accompanying changes in drop morphology.     

几种针状焦性能对比

针状焦分石油系和煤系两大类,这主要取决于针状焦的原料来源。在同一系列中由于原料不同和工艺条件不同 ,针状焦的各自性能也不相同。针状焦是生产超高功率石墨电极和高功率石墨电极的主要原料 ,针状焦的性能对石墨电极的质量有至关重要的影响。所以对针状焦性能以及其对石墨电极质量影响的研究十分必要的。以下是常用的几种进口针状焦和国产针状焦的性能对比。１原料性能分析对比原料试样包括４种针状焦 ,其中两种为进口针状焦：三菱针状焦和新日化针状焦;另两种为国产针状焦：鞍山针状焦和锦州针状焦。其中除锦州针状焦是石油系针状焦外…     

茶多酚提取方法进展

本文综述了国内外现有茶多酚提取方法的现状以及近期的研究进展，并对其优缺点进行了评价。这将有助于中低档茶的综合利用和茶多酚的进一步开发应用。     

ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

Viscosity of Simple Soda-Silicate 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log₁₀ viscosity amounting to 0.6, those of Washburn et al., being relatively too high. If correction for this is made, the isothermal curves of log₁₀ viscosity as a function of soda content are smooth up to 50% Na₂O, showing no inflection. The observations as a function of temperature T are all represented within accidental error by an equation of the type where all three constants vary regularly with the composition. Change of Viscosity of Glass (6SiO₂, 2Na₂O) due to Molecular Substitution of CaO, MgO and Al₂O₃ for Na₂O The effect is clearly brought out by plotting (from the results of English) the change of log₁₀η due to the substitution as a function of temperature. The curves each show a sharp bend at a temperature between 840° and 1050°C, which is designated the aggregation temperature T_a. If we divide these curves by the corresponding percentage substituted, we get curves for each oxide which are straight and parallel below the aggregation temperatures, the slopes (increase of change of log₁₀η per 100°C) being −0.056 (CaO), −0.055 (MgO), −0.018 (A1₂O₃) per per cent oxide substituted. For substitution of 1/2 molecule the slopes are −0.325 (CaO), −0.23 (MgO) and −0.18 (Al₂O₃) per 100°. At the aggregation temperature the change of log₁₀η per per cent is a minimum, 0.03 to 0.06 for CaO, 0.12 for MgO, 0.07 for Al₂O₃. Evidence of Aggregation in Glasses, from viscosity Measurements The sharp bends in the plots of change of log₁₀η due to substitution of an oxide for Na₂O, suggest the beginning of molecular aggregation at these temperatures. These aggregation temperatures are close to the devitrification temperatures, but the effect on the viscosity curves cannot be due to actual devitrification since it does not change with time. Taking the aggregation temperatures as equal to devitrification temperatures, additional isotherms are roughly sketched into the equilibrium triangle of the system Na₂O-CaO-SiO₂. Change of Viscosity of Glass (4SiO₂, 2Na₂O) due to of Substitution of B₂O₃ for SiO₂ The change of log₁₀η (from the results of English) is plotted as a function of temperature, and also the change of log₁₀η per per cent B₂O₃. The curves are more complex than for the substitution for Na₂O.     

环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

骑式摩托车油箱喷涂工艺的改进

面对日益激烈的市场竞争,摩托车油箱外观质量越来越成为影响销售的因素之一。文章介绍了改进工艺后的油箱涂装,该涂装体系提高了油箱外观的丰满度,降低了油箱涂装的生产成本。     

聚酰亚胺的合成法

本文评述了缩聚型聚酰亚胺的主要合成方法和近年来国际上在合成中所做的探索。