Silica Nanotube Reactors for Catalytic Polymerization of Styrene and Olefins

Autor:	Joong Jin Han, Kyu Yong Choi, Sang Yool Lee, Sang Bok Lee
Rok vydání:	2010
Předmět:	chemistry.chemical_classification Nanotube Materials science Polymers and Plastics Organic Chemistry Methylaluminoxane Chain transfer Polymer Polyethylene Condensed Matter Physics chemistry.chemical_compound chemistry Polymerization Tacticity Polymer chemistry Materials Chemistry Polystyrene
Zdroj:	Macromolecular Symposia. 289:25-32
ISSN:	1521-3900 1022-1360
Popis:	Silica nanotube reactor (SNTR) has been designed and used as a novel catalytic polymerization reactor device to synthesize syndiotactic polystyrene (sPS), and polyethylene with Cp * Ti(OCH 3 ) 3 and rac-Et(indenyl) 2 ZrCl 2 metallocene catalysts in conjunction with methylaluminoxane (MAO). The highly crystalline sPS molecules polymerized within the SNTR form nano-scale polymeric fibrils of 30―50 nm in diameter that further intertwine to fill the nanopore. The polymer molecular weight of sPS has been found to increase significantly in the SNTR. A simplified mathematical reaction model for the SNTR suggests that hindered chain transfer reactions in the nanopores filled with rigid polymeric nanofibrils might have caused the extended polymer chain length. The morphological characteristics of polymeric nanofibrils and the effect of SNTR's geometric confinement on the polymer properties are also discussed. It is also demonstrated that the liberated SNTR can be a novel 'See-Through' tool for visual observation when it is analyzed by transmission electron microscopy.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::31a853e96b49dd0aa22dd9bb55a05bac https://doi.org/10.1002/masy.200900004 Zobrazit plný text záznamu Plný text