R2 represents a branched or unbranched alkyl group with 5 to 17 carbon atoms;
R2表示支化或未支化的具有5-17个碳原子的烷基；
Their extraction ability markedly decreases with the increase of the steric hindrance from ester alkyl group.
萃取能力随着酯烷基空间位阻的增大而显著降低。
Conclusion Introducing the methyl group or a low alkyl group resulting in the high selectivity and increase of its activity.
结论甲基或低级烷基的引入导致了高选择性，使其活性增大。
Where EVM is the sum of eigenvalue of bonding orbital-connection matrix of the alkyl group and PEI is the polarizibility of alkyl.
EVM为醇中烷基的键连接矩阵特征根之和，PEI为烷基的极化效应指数。
With increasing number of carbon atom of alkyl group in the ionic liquid the extraction efficiency of lithium obviously increased.
锂的萃取率随离子液体中烷基碳原子数的增加而增加。
The achievements of her research in acid dyes with high carbon alkyl group, reactive dyes, reactive disperse dyes and silk dyes were mainly reviewed.
在研究领域中着重介绍她在含长碳链烷基酸性染料、活性染料、活性分散染料及丝绸染料方面的成就。
The electron withdrawing group (F) being introduced into the alkyl groups of then-hexyl ZDDP is able to strengthen chemical adsorption between ZDDP and Fe atoms.
在伯烷基上吸电子基团能增强硫原子与铁原子之间的化学吸附作用力。
Emulsifying system using alkyl sulfates, alkyl benzene sulphonate and so on as negative ion surfactant to compound with alkyl, phenolic group polyethylene and polyvinyl alcohol.
乳化体系采用烷基硫酸盐、烷基苯磺酸盐等阴离子乳化剂与烷基酚基聚氧乙烯醚、聚乙烯醇等非离子乳化剂进行复合使用。
The preparation and respective characteristics of polysiloxane with polyether, amino, quaternary ammonium, alkyl and so on functional group are summarized.
阐述了带有聚醚基、氨基、季铵基和烷基等功能基聚硅氧烷的制备方法以及它们各自的特性。
X-ray photoelectron spectroscopy (XPS) indicated that the higher reaction activity of alkyl halide, the more alkyl substitution degree on hydroxyl group of chitosan.
对烷基化壳聚糖进行X射线光电子能谱分析表明，随着卤代烷试剂反应活性的增高，发生在壳聚糖羟基上的烷基取代反应增多。
And the length and branching of alkyl chain in the hydrophobic group are main structure factors affecting surfactants' efficiency and effectiveness.
而表面活性剂亲油基的碳链长度和亲油基的支化是影响效率和效能的主要结构因素。
This article mainly focuses on the shape and size control of nanoparticles with organic stabilizers, which have one (or more) coordination group and long alkyl chain.
本文介绍了近年来纳米粒子的控制生长和组装研究的现状。
The results show that the introduction of aromatic ring in the alkyl chain increases the size of the hydrophobic group and decreases the capability of surfactant in reducing water surface tension.
在与大庆原油的油水界面性能的研究中发现，其中一类表面活性剂表现出较好的界面性能。
The results show that the introduction of aromatic ring in the alkyl chain increases the size of the hydrophobic group and decreases the capability of surfactant in reducing water surface tension.
在与大庆原油的油水界面性能的研究中发现，其中一类表面活性剂表现出较好的界面性能。
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