{"title":"Polymer-supported titanium-magnesium catalysts for ethylene polymerization","authors":"A.M. Bochkin, A.D. Pomogailo, F.S. Dyachkovskii","doi":"10.1016/0167-6989(88)90055-4","DOIUrl":null,"url":null,"abstract":"<div><p>A new method for synthesis of polymer-supported organometallic titanium-magnesium catalysts was developed. The catalysts contain up to 55% of total fixed Ti in the form of isolated Ti(III) ions. Ti(III) is formed in the alkylation of Ti(IV) by polymer-supported Mg species. Ti(III) is assumed to coordinate to the polymer support moieties at low Ti(III) content, and to form layers at high Ti(III) content in the catalysts. X-ray analysis indicated the presence of crystallites with dimensions of approximately 4–7.5 nm. The catalytic activity in ethylene polymerization depends on the amount of fixed magnesium. A correlation between catalyst activity and isolated Ti(III) ion content was found. Kinetic parameters of the polymerization in the presence of titanium-magnesium catalysts supported on organic and inorganic carriers were compared. Rate constants for chain transfer to monomer, organoaluminium cocatalysts and hydrogen were calculated.</p></div>","PeriodicalId":101060,"journal":{"name":"Reactive Polymers, Ion Exchangers, Sorbents","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-6989(88)90055-4","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Reactive Polymers, Ion Exchangers, Sorbents","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0167698988900554","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
A new method for synthesis of polymer-supported organometallic titanium-magnesium catalysts was developed. The catalysts contain up to 55% of total fixed Ti in the form of isolated Ti(III) ions. Ti(III) is formed in the alkylation of Ti(IV) by polymer-supported Mg species. Ti(III) is assumed to coordinate to the polymer support moieties at low Ti(III) content, and to form layers at high Ti(III) content in the catalysts. X-ray analysis indicated the presence of crystallites with dimensions of approximately 4–7.5 nm. The catalytic activity in ethylene polymerization depends on the amount of fixed magnesium. A correlation between catalyst activity and isolated Ti(III) ion content was found. Kinetic parameters of the polymerization in the presence of titanium-magnesium catalysts supported on organic and inorganic carriers were compared. Rate constants for chain transfer to monomer, organoaluminium cocatalysts and hydrogen were calculated.
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