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关于烯烃和炔烃用自由基或离子型催化剂引发的共聚反应,迄今尚未见报道,可能由于单体活性相差悬殊的缘故。但用过渡金属催化时,则可发生共聚,例如,乙烯、丙烯和乙炔可在VOCl_3-(C_6H_(13))_3A1/烷烃溶剂催化下共聚成弹性体~([1])。又如全氟丙烯和全氟丁炔-2不能在氟离子催化下共聚~([2]),可是应用了π-二苯铬(O)催化剂~([3])却能成功地将这两种单体共聚为液体、蜡状物和固体,后两者的比例视所用单体的克分子比而异,即全氟丙烯比例高时,蜡状物比例高;反之,固体比例高。值得指出的是,据我们所知,这是在氟碳化合物中首次发现的烯-炔共聚的例子.
Copolymerization of olefins and alkynes with free-radical or ionic catalysts has not been reported so far, probably due to the large differences in monomer activity. However, when catalyzed by transition metal, copolymerization can occur. For example, ethylene, propylene and acetylene can be copolymerized into elastomer ~ ([1]) under VOCl_3- (C_6H_ (13)) _3Al / alkane solvent catalysis. In another example, perfluoropropene and perfluorobutyne-2 can not be copolymerized with fluoride ion catalyzed ~ ([2]), but the π-diphenyl chromium (O) catalyst ~ The two monomers are copolymerized as a liquid, a wax and a solid. The ratio of the latter two depends on the molar ratio of the monomers used, that is, the proportion of the wax is high when the proportion of the perfluoropropylene is high. On the other hand, the proportion of the solid is high. It is worth pointing out that to the best of our knowledge this is an example of the ene-alkyne copolymerization first discovered in fluorocarbons.