查询词典 ethylene glycol

In our experiments, ethylene glycol dimethyl ether is selected as the reaction solvent.

在本研究工作中，以乙二醇二甲醚为反应溶剂。

Polyesters are produced by a condensation reaction of a diol, such as ethylene glycol, with a dicarboxylic acid.

聚酯是由一缩合一二醇，例如乙二醇，以二元酸。

The results show that the distillate temperature of DLLA is lowed by the addition of diluent ethylene glycol, and the carbonization phenomenon can be avoided, which increases the yield of DLLA from 36.8% to 51.3%.

研究结果表明，在反应体系中加入乙二醇作为稀释剂，能降低DLLA的馏出温度，避免了DLLA在蒸馏过程中产生炭化现象，并使DLLA的平均产率由36.8%提高至51.3%。

The affections on the yield of DLLA caused by catalyst, temperature and time etc. were studied. By using ethylene glycol as diluent, the distillate temperature of DLLA was lowed and the carbonization phenomenon could be avoided, which caused the yield of DLLA increasing from 36.8% to 51.3%. The molecular weight of PDLLA prepared by this method could reach 184,000. DLLA and PDLLA was characterized and analyzed by DSC, XRD and IR.The key of direct method to synthesize PDLLA is the exclusion of H2O from reaction system.

丙交酯开环聚合制备PDLLA的关键在于中间体D，L-丙交酯的制备，研究了催化剂、反应温度、反应时间等因素对DLLA产率的影响，通过在反应体系中加入稀释剂乙二醇，DLLA的馏出温度明显降低，避免了DLLA在蒸馏过程中产生碳化现象，并使DLLA的平均产率由36.8％提高至51.3％，制备的PDLLA分子量最大值达18.4万。

In borate solution, The order of effective mobilities of disaccharide-borate compolexes was saccharose＜celloiose＜ maltose＜lactose and that of polylol- borate complexes was ethylene glycol＜ propanetriol＜erythritol＜sorbitol＜mannitol＜dulcitol.

在碱性四硼酸钠溶液中二糖硼酸络合物淌度顺序为：乳糖＞麦芽糖＞纤维二糖＞蔗糖，多元醇硼酸络合物的淌度顺序为：六羟基多元醇＞四羟基多元醇＞三羟基多元醇＞二羟基多元醇。

Advances in the catalysts for synthesis of ethylene glycol ethers via etherification were reviewed, and some suggestion were made for development of new catalysts.

介绍了醚化反应法合成乙二醇醚催化剂的研究进展，并对催化剂的开发提出了建议。在进行环氧乙烷与醇的醚化反应时，使用传统的碱性催化剂，反应容易形成多醚；使用传统的酸性催化剂，反应容易形成有毒物质二烷。

The current situation of the world supply and demand and capacity expansion of ethylene glycol were described.

概述了世界乙二醇供需现状和扩能情况，分析了乙二醇的消费结构，回顾了乙二醇的技术进展。

The role of the ethylene glycol and ethylenediamine in the growth and self-assembly of ZnO nanosheets into Microspheres and layered conglomerates was investigated, and possible mechanisms were also proposed.

研究了乙二醇和乙二胺在ZnO微球和层状集聚体形成过程中的作用并提出了可能的生长机理。

The role of the ethylene glycol and ethylenediamine in the growth and self-assembly of ZnO nanosheets into the micro-spheres and layered conglomerates was investigated, and possible mechanisms were also proposed.

研究了乙二醇和乙二胺在ZnO微球和层状集聚体形成过程中的作用并提出了可能的生长机理。

Optimal concentration range of iodine, sulphur dioxide formamide and ethylene glycol in the electrolyte is obtained.

并得到了卡尔·费休试剂配制的电解液中碘、二氧化硫、甲酰胺和乙二醇的最佳浓度范围。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。