Nano, micro, and bulk structures in atactic polystyrene – syndiotactic polystyrene blends obtained in situ in presence of the CpTiCl3/SiO2/MAO catalysts (Cp – cyclopentadienyl, MAO – methylaluminoxane)

•Syndiotactic and cationic centers on heterogenized titanium catalysts.•Nano, micro and macro aPS–sPS blends.•Nano-syndiotactic polystyrene ball and fibrous forms. CpTiCl3/SiO2/MAO (Cp=cyclopentadienyl, MAO – methylaluminoxane) catalysts, where the Al:Ti varies from 20:1 to 500:1, were used in styre...

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Bibliographic Details
Published in:Journal of colloid and interface science 2013-08, Vol.404, p.91-101
Main Authors: Skupiński, W., Plewka, A., Wieczorek, Z., Wachowski, L., Hofman, M., Czajka, B.
Format: Article
Language:English
Subjects:
Aluminum
Atacticity
Catalysis
Catalysts
Chemistry
Exact sciences and technology
General and physical chemistry
In situ sPS–aPS blends
Nanomaterials
Nanostructure
Polymer blends
polymerization
Polystyrene resins
polystyrenes
scanning electron microscopy
styrene
Supported titanocene
Syndiotacticity
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Titanium
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Summary:•Syndiotactic and cationic centers on heterogenized titanium catalysts.•Nano, micro and macro aPS–sPS blends.•Nano-syndiotactic polystyrene ball and fibrous forms. CpTiCl3/SiO2/MAO (Cp=cyclopentadienyl, MAO – methylaluminoxane) catalysts, where the Al:Ti varies from 20:1 to 500:1, were used in styrene polymerization. Atactic – syndiotactic polystyrene blends (aPS–sPS) were obtained in situ, the morphology of which was investigated by means of scanning electron microscopy. The blends morphology changed according to the kind of catalytic centers: cationic and syndiotactic on the catalyst surface, which create individually atactic or syndiotactic polystyrenes forming specific blends containing nano or micro-forms: when the Al:Ti ranges from 50:1 and to 100:1 in the blends, there occur nano-sPS particles 40–120nm in size, if the Al:Ti⩾300:1, the filament of δ-sPS polymorph, is produced where the filament size ranged from 30 to 10nm. A decay of this form leads to the formation of spherical sPS forms several hundreds of nm in size. When the Al:Ti ranges 20:1–50:1, blend rods of several dozen micrometers were obtained.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2013.03.061