乙烯的

First, 4-(2, 3-epoxypropoxyl) benzaldehyde was obtained by reaction of 4-hydroxy benzaldehyde and epichlorohydrin. Then, the Wittig reaction was carried out to convert EBD to styryl glycidyl ether.

首先用对羟基苯甲醛和环氧氯丙烷反应制备4-(2， 3-环氧丙氧基)苯甲醛，然后通过Wittig反应将醛基转化为乙烯基得到含环氧基团的功能性单体苯乙烯基环氧丙基醚，最后用ATRP方法聚合单体SGE得到含环氧侧基的聚苯乙烯。

The effects of MMA and alumina trihydrate on properties of oligourethane methacrylate resins were investigated. And the curing reactivities of unsaturated polyester resin, vinyl ester and UM resin were compared by various methods.

研究了甲基丙烯酸甲酯和三水合氧化铝含量对聚氨酯甲基丙烯酸酯树脂性能的影响，比较了不饱和聚酯树脂、乙烯基树脂和UM树脂的固化反应活性。

The invention relates to a pipeline polyurea outer anticorrosive coating and the making method thereof, making heated prepolymerization reaction on dibenzo-methane diisocyanate, carbodiimide diisocyanate, polyether binary alcohol and polyether trihydric alcohol to prepare prepolymer solution A, and making end amino polyethylene oxide ether, dimethyl sulfur-based toluene diamine, diethyl diamine, iso-propyl titanate solution, polyacrylate, carbon black, titanium dioxide and lightweight calcium carbonate into solution B, and as using, respectively heating the solutions A and B to 65 deg.C and then mixing them, then quickly spraying and curing to form a coat.

本发明涉及一种管道用聚脲外防腐涂料及制造方法，由二苯基甲烷二异氰酸酯、碳化二亚胺化二异氰酸酯、聚醚二元醇和聚醚三元醇通过加热预聚反应制成预聚物的A液、由端氨基聚氧化乙烯醚、二甲硫基甲苯二胺、二乙基甲苯二胺、钛酸异丙酯溶液、聚丙烯酸酯溶液、碳黑、钛白粉和轻质碳酸钙配制而成的B液组成，使用时将A液和B液分别加热至65℃后混合，然后快速喷涂固化形成涂层。

Compared with the catalytic behaviors of the reference catalysts, CpTiCl〓 and n-CpTiCl〓, we could identify that the pendant ethereal group played an important role in this selective trimerization process.

将它们的催化性能与CpTiCl〓、n-CpTiCl〓比较，可以确定，氧对钛活性中心的配位对乙烯三聚反应起重要作用。

Due to the hemilability of the heteroaromatic functionalized cyclopentadienyl ligand, these complexes showed considerable activity and high selectivity for ethylene trimerization to 1-hexene.

由于这类芳香杂环-茂配体具有Hemilabile特性，因此，此类络合物显示了一定的乙烯三聚活性和高的三聚选择性。

It is a braided packing made of Kevlar yarns impregnated with P.T.F.E.dispersion and treated with lubricant,This packing can bear hither-pressure applications than other typees of braided packings ,Due to its steel-lide strength,this yarn can be employed separately or as back-up rings with other types of packing.

TW-203芳纶纤维盘根：它是同Kevlar纤维经浸渍四氟乙烯乳液及用润滑剂，处理再编织而的盘根，这种盘根比其它各种编织盘根能承担更高的介质压力，由于这种线像钢丝一样强，它可和其它种类盘根分隔安装或作为端面环。

We designed new soluble poly(2,6-anthracene vinylene),and the structure and some properties were characterized by ~1H NMR, DSC and TGA and GPC.

本文以我们新近合成的2，6-二甲基蒽为起始原料，在国际上首次设计合成了可溶性的聚2，6-蒽基乙烯，对各中间体和目标聚合物进行了必要表征。

We anticipate the demand of formaldehyde will up to 2,930,000 tons, and 1,320,000 tons of methanol will be consumed;② At present, the acetic acid mainly produced by food zymotechnics or ethane in our country, along with the development of synthesizing acetic acid process with methanol, the demand of methanol will increase rapidly.

预计2010年甲醛需求量将达到293万吨，届时消费甲醇达132万吨；②目前我国醋酸生产多采用粮食发酵法或乙烯法，随着甲醇羰基合成醋酸工艺的发展，对甲醇的需求将迅速增加。

Ethylene adsorbs more strongly than benzene and ethylbe...

乙烯与乙苯的反应较丙烯与异丙苯的反应难于进行。

Proprietary expanded teflon dielectric flattens frequency response for superior picture and sound.

专有扩展聚四氟乙烯绝缘平展提供卓越的图像和声音的频率响应。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。