Model cross-linked polybutadiene

The nitrene obtained by photolysis may under certain conditions be highly radicalar, and this method of preparation, likely to cause cross-linking, was avoided. When prepared by a-elimination, carbethoxynitrene reacts with cyclohexene to give a mixture consisting of 85% addition product and 15% various substitution products (13). This reaction was used in attempts to prepare macromolecules with a polyethyleneimine structure. A preliminary investigation showed that the polyisoprenes react to a greater extent than the polybutadienes, and the reaction was first studied on model polyisoprenes. 

Polymers have also been used for the coating of alumina. Thus, maleic acid adsorbed onto the alumina surface was, in situ, polymerized with 1-octadecene and cross-linked with l,4-divinylbenzene. ° It was assumed that the polymer forms a monolayer on the alumina, forming a reversed-phase surface. This assumption was substantiated by results showing that the retention order of model compounds was the same as on an ODS column. The lower separation capacity of the new stationary phase was tentatively explained by the lower surface porosity of alumina. Principal component analysis was employed for the elucidation of the relationship between the retention behavior of non-homologous series of solutes on polybutadiene (PBD)-coated alumina and their physicochemical parameters.Calculations revealed significant relationships... 

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