Silica-supported metallocenes: effect of the preparation procedure on the morphology of polyethylene particles

Autor:	Chyi-Yang Sheu, Chiu-Hsun Lin
Rok vydání:	2000
Předmět:	Morphology (linguistics) Materials science Polymers and Plastics Fiber structure Organic Chemistry Polyethylene Catalysis chemistry.chemical_compound Adsorption chemistry Chemical engineering Particle-size distribution Polymer chemistry Materials Chemistry Metallocene
Zdroj:	Macromolecular Rapid Communications. 21:1058-1062
ISSN:	1521-3927 1022-1336
DOI:	10.1002/1521-3927(20001001)21:15<1058::aid-marc1058>3.0.co;2-k
Popis:	Polyethylene (PE) particles are produced by a catalyst prepared by contacting a (C 4 H 9 Cp) 2 -ZrCl 2 /MAO pre-mixing solution with SiO 2 support. These particles have a large granular size and very few fine particles compared with those derived from a catalyst prepared by adsorption of (C 4 H 9 Cp) 2 ZrCl 2 onto methyaluminoxane modified SiO 2 . The amount of Al in the pre-mixing catalyst size distributiuon. The optimal concentration is about 30 wt.-%. The PE particles produced using a pre-mixing catalyst consist of globules with randomly oriented fiber structure on the surface, whereas those produced using adsorption catalysts have worm-like fibrils protruding from the PE globule surface.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::50d4387e560e179c4897ec5fddd913fc https://doi.org/10.1002/1521-3927(20001001)21:15<1058::aid-marc1058>3.0.co Zobrazit plný text záznamu Plný text