乙二醇

In the present study,a series of novel amphiphilic graft glycol chitosan were synthesized by introducing different hydrophobical groups.

本文选择乙二醇壳聚糖作为母体聚合物，通过引入不同的疏水基团，合成了一系列具有不同物理化学性质的两亲性乙二醇壳聚糖聚合物。

The optimum conditions are: molar ratio of glycol to cyclohexanone is 1.6:1, the quantity of catalyst is equal to 0.25% of feed stocks, and the reaction time is 40 mm. H3PW12O40/MCM-48 is an excellent catalyst for synthesizing cyclohexanone ethylene ketal and its yield can reach over 80.63%.

实验表明：H3PW12O40/MCM-48是合成环己酮乙二醇缩酮的良好催化剂，在n：n＝1：1.6，催化剂用量为反应物料总质量的0.25%，环己烷为带水剂，反应时间40min的优化条件下，环己酮乙二醇缩酮的收率可达80.63%。

Two new kind of energy transfer donor-acceptor dyads consisting of α-naphthoic acid moiety and 9-aminoacridine units linked by tetraethylene glycol or triethylene glycol flexible chain have been synthesized.

本工作分别用聚三乙二醇及聚四乙二醇柔性链将α-萘甲酸酯与9-氨基吖啶连接起来，合成了两种新型二元发色团分子体系，在两个体系中，选择激发α-萘甲酸酯，都可以发生从α-萘甲酸酯到9-氨基吖啶的高效率的单重态-单重态能量传递。

Methods: According to the relationship between psychophysiologic disorders and constipation, 114 patients with STC were divided into three groups which received venlafaxion hydrochloride , polyethylene glycol 4000（PECA000） or both of them respectively.

根据便秘与精神心理异常的因果关系，将STC患者分为三组，分别服用文拉法辛、聚乙二醇4000及文拉法辛和聚乙二醇4000，比较治疗前后HAMA、HAMD评分、大便性状、排便次数及胃肠通过时间测定变化。

Using ethylene glycol as solvent, all the three source materials were takingpart in polyreaction of gel. The solubility of bismuth subnitrate in ethyleneglycol was accelerated greatly due to the production of nitrate ester during thepolymerization of precursors.

SBT粉体的溶胶—凝胶制备过程表明：在以乙二醇为溶剂时，三种原材料都参与了聚合反应，前驱物聚合反应过程中有硝酸酯产生，因而促进了硝酸氧铋在乙二醇溶液中的溶解性能。

In the presence of the phase transfer catalysts such as tetramethylammonium bromide, tetraethylammonium bromide or polyethylene glycol(MW 400 and 6,000),lithium hydroxide is the best alkali among lithium hydroxide ,sodium hydroxide and potassium hydroxide.

研究表明在溴化四甲基铵、溴化四乙基铵、聚乙二醇（分子量为6，000）和聚乙二醇（分子量为400）相转移催化体系中，氢氧化锂最好，氢氧化钾次之，氢氧化钠最次。

In this paper a series of multiblock copolymers were synthesized by polycondensation of poly , phthalic anhydride and epoxy resin in the presence of triethyl benzyl ammonium chloride as the catalyst.

以三乙基苄基氯化铵为催化剂，将聚乙二醇、邻苯二甲酸酐和环氧树脂进行共缩聚，制得聚乙二醇-环氧树脂系列多嵌段共聚体。

A series of novel polyethylene glycol derivates was synthesized by esterification of chloroacetic acid with polyethylene glycol. Because of the good reactive activity of α-chlorin in the esters it can react with 5-fluorouracil, thus the conjugate can be obtained .

采用氯乙酸与不同分子量的聚乙二醇进行酯化反应得到氯乙酸聚乙二醇酯，由于酯中的α-氯具有良好的反应活性，将它再与抗癌药物5-氟尿嘧啶结合制备了不同分子量的高分子前药。

The macromer, methoxy polyethylene glycol methacrylate, used for polycarboxylate based superplasticizer was prepared by esterification of methacrylic acid and methoxy polyethylene glycol.

以聚乙二醇单甲醚和甲基丙烯酸为主要原料，通过酯化反应制备聚羧酸系减水剂大单体聚乙二醇单甲醚甲基丙烯酸酯。

The Pd2-H2O-PEG system are impressive activating for a wide range of substrates.Therefore, palladium catalyzed reactions with PEG has been carried out.

而醋酸钯-水-聚乙二醇催化系统可广泛的活化反应物是颇让人印象深刻的，因此聚乙二醇可有效地促使钯的催化进行反应。

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。