查询词典 silanes

Gas phase chromatography, mass spectrum and infrared spectrum are used to characterize the novel silanes structures.

应用气相色谱质谱和红外光谱表征了它们的分子结构。

The effects of different electron donors such as ethyl benzoate diisobutyl phthalate, 2,2,6,6-tetramethyl piperidine and various silanes as internal donor and external donor respectively were investigated.

研究了不同给电子体分别作为内给电子体和外给电子体对MgCl2载体催化剂体系活性和定向性能的影响。

By using this methodology, alkenyl silanes which have useful applications from a synthetic point of view could be easily obtained.

藉由改变起始物硫缩醛的取代基，或是使用不同的格林那试剂，我们能利用此烯化反应得到在有机合成上有许多应用的有机矽化合物。

Compared with the previous method, the improved route can provide directly a spheroid form of immobilized lipase particles of which the size can be controlled by adding non-ionic surfactants during the preparation process so as to increase the recovery rate of enzyme as well as decrease the external diffusional restriction which can diminish the enzyme activity. The improved method can also alter the hydrophobicity and microstructure of the immobilized enzyme matrix by changing the molar ratios of different alkoxyl silanes so as to enhance the enzyme activity by a"surface active effect"and eliminating the internal diffusional restriction.

与前人的制备方法相比，改进的方法可直接制得球形的固定化酶颗粒，而且颗粒的大小可以通过在制备过程中加入非离子型表面活性剂加以控制，从而可以提高固定化过程的酶活回收率和减小外扩散效应对酶的表观催化活力的影响；改进的方法还可以通过改变原料硅氧烷的种类及配比来改变最终制得的固定化载体的疏水性质及微观结构，从而通过对脂肪酶的&界面活化&作用和减小内扩散效应提高固定化脂肪酶的表观酯化活力。

A series of organic-inorganic hybrid membrane were prepared by introducing mercapto silanes and amino silanes to sulfonated BPPO membranes through in-situ sol-gel.

将巯基硅氧烷和胺基硅氧烷引入到磺化BPPO膜中，通过原位溶胶凝胶法制备有机无机杂化膜。

However, silanes do not interact to any significant degree with the ubiquitous calcium carbonate, or with barium sulphate, carbon black or boron compounds, and cannot be used as coupling agents with these fillers.

但是，硅烷不与使用普遍的碳酸钙有任何作用，与硫酸钡、碳黑或者硼化合物也是这样，因此硅烷不能用作这些填料的偶联剂。

Examples of metal chelating groups include hydroxides especially aryl or heteroaryl hydroxides such as phenolic hydroxides; amines which may be aliphatic aryl or heteroaryl; mercaptans which may be aliphatic aryl or heteroaryl; carboxylic acids which may be aliphatic aryl or heteroaryl; oximes and ketoximines; acetarylamides; hydroxy silanes and silicones; N-containing heterocycles such as imidazoles benzimidazoles triazoles benzotriazoles thiazoles isothiazoles acid anhydrides and more preferably acid groups (especially carboxylic acid groups phosphoric acid groups polyphosphoric acid groups phosphonic acid groups sulphuric acid groups and sulphonic acid groups).

金属螯合组的例子包括氢氧化物，特别是芳基或如酚醛氢氧化物杂氢氧化物；胺可能是脂肪族，芳基或杂；硫醇可能是脂肪族，芳基或杂，这可能是脂肪族，芳基或羧酸杂；肟和ketoximines； acetarylamides；羟基硅烷和有机硅，含N，如咪唑，苯并咪唑类，三唑类，苯并三氮唑，噻唑类，isothiazoles，酸酐杂环，多最好酸组（特别是羧酸团体，磷酸，团体，多聚酸组，膦酸组，硫酸团体和磺酸组）。

The effectiveness of titanates we will focus on some results that would be impossible to obtain with silanes.

为了突出钛酸酯的效用，我们将强调使用硅烷无法得到的一些结果。

These are conceptually similar to silanes and titanates and find limited use in highly specialized applications.

这些偶联剂在概念上与硅烷和钛酸酯相似。在高度专用的领域，有一些有限的应用。

Like silanes they have four functional groups, but where silanes have only one pendant organic functional Y group, titanates have three, providing more effective coupling to the resin.

象硅烷一样，钛酸酯有四个官能团，但是硅烷只有一个悬挂的有机官能团 Y ，钛酸酯有三个，从而提供与树脂更有效的偶联。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。