二聚

The bromo-polyethylenegylcol-monomethacrylate was synthesized by two steps. Firstly, methylacrylic acid was esterified with polyethylene glycol (PEG, M=200, 400) to give polyethyleneglycol-monomethacrylate Secondly, treatment of PEG-MA with phosphorus tribromide gave the aim product.

以聚乙二醉（M分别为200，400）和甲基丙烯酸进行单酯化反应，所得单酯再与三溴化磷进行溴化反应合成了一种新的两端具有功能团的不饱和溴化物，即溴代甲基丙烯酸单聚乙二醇酯。

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。

First, N'-(4-aminophenyl)-N'-4-(5-phenyl-1,3,4-oxadiazol-2-ylphenylbenzene-1,4-diamine was prepared and polymerization was carried out by direct polycondensation with a series of dianhydrides to obtain polyimides containig triphenylamine units in the main chain and 1,3,4-oxadiazole moieties as pendent group.

首先合成新型双胺N'-(4-aminophenyl)-N'-4-(5-phenyl-1，3，4-oxadiazol-2-ylphenylbenzene-1，4-diamine后，与一系的芳香族二酐进聚缩合反应，可制得一系列三苯胺为主链且1，3，4-恶二唑为侧链的聚醯亚胺。

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 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。

As superplasticizer , a series of comb-shaped copolymers of polycarboxylic acid were synthesized by polyoxyethylene allyl methyl diether, maleic anhydride, and styrene with different initiators,and esterified with PEO-n.

以聚氧乙烯甲基烯丙基二醚、顺丁烯二酸酐、苯乙烯等为共聚单体，采用不同引发剂，合成了一系列聚羧酸型梳状共聚物超分散剂，并以PEO n单酯化得酯化产物，研究了共聚物的结构、组成、添加量等对水泥粒子分散性能的影响。

The technology of separation and purification of the interesting protein was studied, centrifuge the sample and get the clear supernatant, remove protein by 50％ ethanol, concentrate by drying with freezing way, remove salt and pigment by dialysing, separation with G-50 and CM-cellulose52 column, concentrate by PEG6000, The purified sample was a single band after separation by SDS-PAGE.

研究了目的阿片肽的分离纯化工艺。发酵混合物经过离心取上清，乙醇沉淀去蛋白，冷冻干燥浓缩，透析除盐脱色，聚乙二醇6000反渗透浓缩，G-50柱分离，CM-cellulose52阳离子交换层析，聚乙二醇6000浓缩等步骤后得到了较纯的目的产物，目的产物在SDS-PAGE上呈现单一条带。

The effect of controlling microstickies in recycled newspaper pulp and the effect on the resultant paper property of some fixatives,including inorganic polyaluminum chloride,organic polyamine,polydiallydimethyl ammonium chloride,and high cationic starch,were investigated in this paper.

分别以聚合氯化铝、聚胺、聚二甲基二烯丙基氯化铵和高取代度阳离子淀粉作为固定剂，研究了它们对废纸浆中微胶黏物的控制效果及对纸页性能的影响。

The interaction between polyethylene glycols and unsaturated polyester reduces the crystallization the PEG component, which is related to the molecular weight and content of the PEG in the system.

发现二者良好的相容性限制了聚乙二醇的结晶倾向。共混体系中聚乙二醇的结晶程度与其分子量和含量有关，分子量或含量越大，则结晶倾向越大。

It has confirmed that the reactive terminated polyethylene glycols did participate into the curing reaction and construct the soft segments in the crosslinking network.

此外，聚乙二醇的加入还使不饱和聚酯固化反应的活化能明显提高；而改性聚乙二醇的加入，却不影响体系固化反应的活化能。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。