Influence of the method of synthesis on the properties of TiCl3

✍ Scribed by Fernanda M.B. Coutinho; Thais H.S. Costa; Luiz C. Santa Maria; Romeu Pereira

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 313 KB
• Volume: 28
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(92)90045-4

✦ Synopsis

The role of ethers in the synthesis of a highly active and stereospecific catalyst for propylene polymerization has been investigated. Diisoamyl ether (DIAE) and tetrahydrofuran (THF) were employed as electron-donors in the/~-TiCI3 treatment during the three-step synthesis. Dibutyl ether (DBE) was used as a first internal base complexed with TiC14 and Et2C1AI (DEAC) in iso-octane solution in the one-step synthesis. While the use of DIAE and THF in the three-step synthesis has mainly led to the formation of ~/-TiC13, the use of DBE in the one-step synthesis has led to the formation of a highly active and stereospecific 6-TiCI3. The effects of ethyl benzoate, tributyl phosphate and diisobutyl phthalate as second internal bases on the crystalline modification, activity and stereospecificity of TiC13 have also been studied. Possible causes for the formation of different TiC13 crystalline structures are discussed through comparison of both routes of TiC13 synthesis.