官能团

The effects of oxiammonolyzation by hydroperoxide on the main functional groups of wheat straw alkaline lignin were studied.

研究了麦草碱木质素的过氧化氢氧化氨解对主要官能团的影响。

But as a nanotube is such an unusual macromolecule, it leads to indissolubility and chemical reaction cannot occur.

然而，当碳纳米管的结构发生特定变化时并产生一些具有反应活性的官能团之后，化学反应就可能进行。

In addition, piperidine nitroxides, which exhibit a chemical inertness, relatively nontoxic and strong EPR signals, were studied.

并考察了性质稳定、毒性小、具有较强电子顺磁共振信号的哌啶氮氧自由基，在其4位上连接具有不同性质的官能团，研究其各项性质的变化。

The prepolymers can be prepared having isocyanate, hydroxyl, or a variety of other reactive functional groups.

可以制备具有异氰酸酯、羟基、或各种其它反应官能团的预聚物。

Among the variousα-oxo ketene dithioacetals,α-alkenoyl ketene dithioacetals are easier to prepare and bear much more functionalities.

在众多的α-羰基二硫缩烯酮类化合物中，α-烯酰基二硫缩烯酮具有易于制备，官能团多等特点。

It was found that Pd-Co/active carbon catalyst was the optimal catalyst, and Pd-Co/γ-Al2O3 was also good, but silica and kieselguhr were not proper carriers for the object reaction, because of their stronger surface acidity, which could result in the formation of polymer, jammed the micro pores of catalyst, and then resulted in its deactivation. Addition of Bi, Ce and Cu promoters could not improve the activity of catalyst, but La and Ba promoter could enhance the activity of catalyst apparently, and the Co was the best promoter, especially Co was impregnate in advance. It was attributed to that the pre-impregnated Co may occupy the micro pores of active carbon, and cover some bad functional groups on the surface of catalyst, so that the active and selectivity of catalyst could be enhanced obviously.

研究结果表明，Pd-Co/活性炭催化剂是目标转移加氢反应的最适宜催化剂，Pd-Co/γ-Al203效果也较好，而硅胶和硅藻土由于表面酸性较强，容易造成生成聚合物而堵塞催化剂微孔、使催化剂迅速失活；此外，添加Bi、Ce、Cu等助剂时对活性并无改善作用，而添加La和Ba助剂时可使Pd的催化活性有所提高，效果最好的是Co助剂，尤其是先浸渍Co的Pd-Co/C催化剂，原因是Co占据了活性炭的微孔、覆盖了某些对目标反应不利的官能团，使其活性和选择性都有较大幅度的提高。

The process of crystal formation is mainly controlled by nucleation mechanism and also affected by lacuna mechanism.

其本质是高分子官能团与Ca^(2+)之间存在著静电匹配作用和高分子基质与晶体空间构型互补的结果。

According to the existence of propionyloxy functional group in bilirubin molecular structure, bile is reacted with limewash. Thereby, solids are obtained.

根据胆红素分子结构中含有丙酸基官能团，将胆汁和石灰水反应，得固体颗粒，经酸化、乙醇处理、氯仿提取、浓缩、精制，得胆红素。

It is the hotspot research in the field of synthesis of functional macromolecule materials at present.

利用咪唑啉含有两个氮原子的五元杂环化合物特殊结构，在其合成过程中对官能团"枝接"其他功能基团，使之成为具有特殊功能的化学品，是目前国际上合成功能高分子材料研究的热点。

The research indicated that under the compound use of hydroquinone and methyl quinone or independent use of phenothiazines or nitrogen oxygen free radical made the polymerization retarder, opposite-methyl-phenylsulfon made the esterification catalyst, toluol made the backflow including water condition, the acid mellowly compared to when it was 1.15, the production rate of the synthesis methylacrylic acid polyethylene glycol single methyl ether (400) ester may achieve 98.9%, was extremely similar to the overseas product functional group structure.

研究表明，在氢醌、甲醌复合使用或者单独使用吩噻嗪、氮氧自由基哌啶酮作阻聚剂，对甲苯磺酸作酯化催化剂、甲苯作回流带水的条件下、酸醇比为1.5时，合成的甲基丙烯酸聚乙二醇单甲醚(400)酯产率可以达到98.9%，与国外产品官能团结构十分相似。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。