The product has good catalytic property for the formation of diene stereospecific polymers.

制得的叔碳钕具有对二烯烃良好的定向聚合活性。

Dibenzylidene sorbitol is known as a gelling agent for polyolefln resin.

二亚苄山梨醇是种聚烯烃树脂的核剂。

Compared with diolefine rubber,EPDM has less double bond.

与二烯烃橡胶相比,EPDM的双键很少。

It is caused by the property change of feed stock in storage process and alkadiene polymerization.

造问题的主要原因，是原料油性质在存储过程中发生变化、二烯烃发生聚合。

Recent advances in ring closing metathesis (RCM) reaction, including olefin and enyne metathesis reaction are reviewed.

综述了近几年来关环复分解(RCM)反应的研究进展,包括了烯烃、烯-炔的RCM反应。

PASP-PEG block structure copolymer,comb shaped PASP-PEG block structure copolymer,aspartic acid and glycine,glutamic acid or propalanine copolymer are prepared.

还可以对聚天冬氨的侧链进行改性,引入烷或烯烃、反应活性高的氨酯、磺功能性团,使其得到更广泛的应用。

Three Yuan second grade third rubbers (EPDM) is the ethylene, the propylene and the few non-conjugate diolefin copolymer.

三元乙丙橡胶（EPDM）是乙烯、丙烯和少量非共轭二烯烃的共聚物。

In this thesis, the carbozincation of acetylenic sulfones and its applications in the stereoselective synthesis of polysubstituted olefins were investigated.

本论文研究了炔砜的碳锌化反应及其原位产生的α-磺酰烯锌试剂在立体选择性合多取代烯烃中的应用。

The benzene ring and alkene structural group are much more stable than structural group of sulfoacid for the carbonifying process of polystyrene.

在碳化过程中，聚苯乙烯阳离子交换树脂的苯环结构和烯烃团比磺团稳定。

Ethyl phenylacrylate intermediate bringing a double bond was introduced first,which is subsequently transformed into triketone and then DCM was obtained with high purity.

采用具有烯烃骨架的β-苯丙烯酯为中间体先引入双键,再经过三酮合环制备乙烯吡喃。

The diolefins and alkenyl aromatics are very unstable components which can give gums by polymerization.In giving olefins and alky aromatics the hydrogenation improves the product quality.

二烯烃和烯芳烃是非常不稳定的组分，可聚合产生凝胶。对于给定烯烃和烷芳烃，氢化可以改善产品质量。

The catalysts used to hydrogenate polymer containing polydiolefin units are introduced in this paper.The mechanism of SBS hydrogenation and the development of the kinetics are also referred to.

介绍了目前用于含聚双烯烃链节的聚合物加氢的催化剂的种类，讨论了SBS加氢的机理及加氢动力学的研究进展。