乙烯的

For the reaction between divinyl sulfone and N-ethylethylene-diamine or N-methylpropane-1, 3-diamine , no cross-linking occurred when the feed ratio of A〓 to BB'〓 was 1/1. When the feed ratio of DV to NDA or NPA is 3/2, no cross-linking occurred too in organic solvents such as DMSO, DMF and NMP, while cross-linking does occur in water.

对于二乙烯基砜与N-乙基乙二胺或N-甲基-1，3-丙二胺的反应，当加料配比为1／1时，反应在水和有机溶剂中不会凝胶；当配比为3／2时，反应在有机溶剂中亦不凝胶，而在水中反应时，会经过一种&假凝胶&过程，并最终发生凝胶。

Firstly, partial sulfonated polystyrene were prepared by solution polymerization with the raw materials of styrene, sodium styrene sulfonate and divinyl benzene; Secondly, the SPS/OMMT nanocomposites were prepared by intercalation polymerization with the monmers and organically modified montmorillonite.

首先，利用NMP为溶剂，BPO引发苯乙烯、苯乙烯磺酸钠、二乙烯基苯溶液共聚；同时，采用高分子的单体与有机蒙脱土插层聚合制备了磺化聚苯乙烯阳离子树脂／蒙脱土复合材料。

Ea for the concerted mechanism was 167.24 kJ/mol, while it was 155.20 kJ/mol for the formation of ethoxide intermediate in the stepwise mechanism.

比较苯与乙醇和乙烯发生烷基化反应的机理可以看出，二者作为烷基化试剂对烷基化反应性能影响不大。

In this thesis, the polymerization of triblock copolymer of styrene-butadiene-methyl methacrylate was carried out in glass flask ,with n-BuLi as initiator, 1,1-diphenylethylene as capping agent and Lithium 2(2-methoxyethoxy) ethoxide as additive.

本论文以n-BuLi为引发剂、1，1-二苯基乙烯为戴帽剂、2-(2-甲氧基乙氧基)乙氧基锂为添加剂，对玻璃聚合瓶中非极性-极性三嵌段共聚物聚苯乙烯—聚丁二烯—聚甲基丙烯酸甲酯的合成进行了研究。

This article reports a new kind of copolymer, non polar polar terpolymer : poly(styrene-butadiene-methyl methacrylate ) P(S-b-B-b-MMA prepared by anionic polymerization with n BuLi as initiator, 1,1 diphenylethylene as capping agent and lithium 2-(-methoxyethoxy) ethoxide as complex agent.

以正丁基锂为引发剂， 1 ，1-二苯基乙烯为戴帽剂， 2-(2-甲氧基乙氧基)乙氧基锂为络合剂，在环己烷、四氢呋喃混合溶剂中，采用阴离子聚合法，于－70℃～－40℃合成了非极性-极性的三嵌段共聚物聚苯乙烯-聚丁二烯-聚甲基丙烯酸甲酯，并借用GPC、1H-NMR、DSC、TEM、IR等仪器对共聚物进行了表征。

BACKGROUND: Sponge paste made of polyvinyl alcohol polymer foam has biocompatibility, and properties of hemophagia, imbitition, and wound protection.

摘要背景：聚乙烯醇开孔型泡沫塑料具有生物相容性、吸血、吸液、保护伤口等特性，用其制成的聚氟乙烯海绵贴拟用于创伤止血材料。

The molecular sieve is prepared in the steps: at the room temperature, hexadecyl trimethyl ammonium bromide is mixed and dissolved with the sodium hydroxide, and is added with TEOS in dropping way, and simultaneously added with Me metal salt water solution and lanthanum nitrate solution in dropping way; the pH value of the mixed solution is adjusted by acetic acid to be 10 to 11, and is mixed for 1 to 2 hours after being stabilized; the sol is moved into a polyfluortetraethylene bottle to be heated and crystallized for 2 days in the oven at the temperature of 100 DEG C; after filtering, washing and drying for nights, and being calcined in a muffle at the temperature of 550 DEG C for 3 to 7 hours, the dual-metal-atom improved MCM-41 mesoporous molecular sieve is obtained.

该分子筛的制备为室温下，将十六烷基三甲基溴化铵和氢氧化钠混合溶解，搅拌并滴加入TEOS，同时滴加入Me金属盐水溶液和硝酸镧溶液并搅拌，用乙酸调节pH值至10～11，稳定后搅拌1～2小时，溶胶转入聚四氟乙烯瓶中在100℃下烘箱水热晶化2天，经过滤、洗涤、干燥过夜，马弗炉550℃焙烧3-7h，得双金属原子改性MCM-41介孔分子筛产品。

By desigh,the flame spreading index of the high inflaming retarding ethylene products is below 10,which meets the requirements of engineering fire resistance for safety.

通过设计，高阻燃乙烯基制品的火焰传播指数达到10以下，可以满足工程防火要求，以保证安全。

In the polymerization procedure,S--α-phenyl ethylamine was used as target template molecules,methacrylic acid was selected as functional monomers, ethylene glycol dimethacrylate or divinylbenzene as crosslinker, azobisisobutyronitrile or benzophenone was used as irritator.

以S--α-苯乙胺为模板，甲基丙烯酸为功能单体，分别以二甲基丙烯酸乙二醇酯、二乙烯基苯为交联剂，偶氮二异丁睛或二苯甲酮为引发剂，采用了本体聚合法、悬浮聚合法合成了一系列的S--α-苯乙胺印迹聚合物。

Results There were about 15 kinds of chemical poisons including vinyl chloride,polyvinyl alcohol,isoparaffin,polyvinylacetate,sodium hydrate,ammonia,acid hydroc,methanol,diesel oil,carbon monoxide,carbon dioxide,sulfur dioxide,nitrogen oxides,ozo...

结果在聚氯乙烯的生产过程中，作业场所存在化学毒物较多，主要包括氯乙烯、聚氯乙烯、聚乙烯醇、过氧化物、异链烷烃类、聚乙烯乙酸酯、氢氧化钠、氨、盐酸、甲醇、柴油、一氧化碳、二氧化碳、二氧化硫、氮氧化物、臭氧、二氧化锰等。

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。