丁二烯

Large strain tensile properties of Polycarbonate/ acrylonitrile butadiene styrene polymer were experimentally investigated at different environmental temperatures in this paper.

本文对聚碳酸酯和丙烯腈丁二烯苯乙烯的合金高分子材料不同环境温度下的拉伸性能进行了试验研究。

The second layer (10) comprises: 100 parts by weight of an acrylonitrile-butadiene rubber, said acrylonitrile rubber comprising from 20 to 65 percent by weight of bound acrylonitrile; from 3 to 20 parts by weight, per 100 parts by weight of the NBR, of at least one acid acceptor; from 1 to 10 parts by weight, per 100 parts by weight of the NBR, of at least one organophosphonium salt; and from 0.25 to 10 parts by weight, per 100 parts by weight of the NBR, of at least one amidine.

公开的是一种包含直接相互接触的第一层与第二层的软管；第一层包含从四氟乙烯、六氟丙烯、偏二氟乙烯、和全氟乙烯醚衍生的一种热塑性四元共聚物；第二层包含100重量份丙烯腈丁二烯橡胶，所述丙烯腈橡胶包含约20～约65wt％结合丙烯腈；每100重量份NBR约3～约20重量份至少一种酸受体；每100重量份NBR约1～约10重量份至少一种有机盐；和每100重量份NBR约0.25～约10重量份至少一种脒。

The main results and conclusions are as follows:The trans-1,4 content of polybutadiene increased from 50%to 89%along with the increasing of Al/Li ratio;the trans-1,4 content of polyisoprene increased from 24%to 46%as well as 3,4 content along with the increasing of Al/Li ratio;the microstructure of polystyrene was invariable and atactic.

主要研究结果及结论如下：随着Al/Li的增加，聚丁二烯的反式结构含量从50%增加到89%；聚异戊二烯的反式-1，4-结构含量从24%增加到46%，并且其3，4结构含量也有所增加；聚苯乙烯的微观结构基本没有变化，为无规聚苯乙烯。

The main results and conclusions are as follows:The trans-1,4 content of polybutadiene increased from 50%to 89%along with the increasing of Al/Li ratio;the trans-1,4 content of polyisoprene increased from 24%to 46%as well as 3,4 content along with the increasing of Al/Li ratio;the microstructure of polystyrene was invariable and atactic.

加热器主要研究结果及结论如下：随着Al/L i的增加，聚丁二烯的反式结构含量从50%增加到89%；聚异戊二烯的反式-1，4-结构含量从24%增加到46%，并且其3，4结构含量也有所增加；聚苯乙烯的微观结构基本没有变化，为无规聚苯乙烯。

The eight VOCs were acetophenone, phenol, benzotrichloride, 1, 3-butadiene, chlorobenzene, methanol, methyl chloroform and methylene chloride. They were mixed together with very low concentrations.

所测定的八种VOCs为苯乙酮，苯酚，三氯甲苯，1，3丁二烯，氯苯，甲醇，三氯代乙烷和二氯甲烷。

Mineral Oil, Hydrogenated Styrene/Butadiene Copolymer, Bertholletia Excelsa Seed Oil, Prunus Amygdalus Dulcis Oil, Fragrance.

矿物油，氢化苯乙烯/丁二烯共聚物， Bertholletia棕竹籽油，李野枣石油，香气。

The results indicate that, three-dimensional double-porphyrin derivatives with butadiyne linkages have very large TPA cross section, which is a promising direction for further development of novel TPA materials.

研究发现，以丁二烯为连接桥的三维双卟啉衍生物具有大的双光子吸收截面，是一类有应用前景的双光子吸收材料。

A process for the carbonylation of allylic butenyl ether (for example, methyl crotyl ether, 3-methoxybutene-1 and mixtures thereof) or mixture of butadiene and alcohol and production of beta-gamma unsaturated carboxylic acid esters (for example, methyl-3-pentenoate) utilizing a rhodium-containing catalyst for example, dicarbonylacetylacetonate rhodium(I or the like promoted with an iodide-containing compound (for example, HI, AlI3, SnI4, TiI4, CrI3, and CoI2 or the like).

一种将烯丙型丁烯基醚(如甲基巴豆基醚、3－甲氧基丁烯－1及其混合物)或者丁二烯与醇的混合物羰基化的方法，以及由含碘化物化合物(如HI、AlI3、SnI4、TiI4、CrI3和CoI2或等效物)促进，用含铑催化剂如二羰基乙酰丙酮酸铑(I或其等效物制备β－γ不饱和羧酸酯(如甲基－3－戊烯酸酯)的方法。

Butadiene was polymerized to some extent in the presence of binary catalyst system NdCl33iPrOHAlEt3 in toluene and the allylchloride was then added to the solution in order to cyclize the formed polybutadiene and cyclopolymerize the unreacted butadiene monomers.

采用NdCl3·3i－PrOH－AlEt3稀土催化剂进行丁二烯的顺式聚合，在聚合过程中引入烯丙基氯，进行分子内环化反应以及单体的环聚反应。

Butadiene was polymerized to some extent in the presence of binary catalyst system NdCl33iPrOHAlEt3 in toluene and the allylchloride was then added to the solution in order to cyclize the formed polybutadiene and cyclopolymerize the unreacted butadiene monomers.

采用NdCl3·3i－PrOH－AlEt3稀土催化剂进行丁二烯的顺式聚合，在聚合过程中引入烯丙基氯，进行分子内环化反应以及单体的环聚反应。考察了稀土催化剂用量、n／n（AlEt3）、环化时间、反应温度、单体浓度等对环化反应的影响，并对产物进行了红外光谱、核磁共振光谱的表

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。