Synthesis and properties of hyperbranched polyimides combined with silica

0432323 - ÚMCH 2015 RIV DE eng J - Journal Article
Minko, E. - Sysel, P. - Hauf, M. - Brus, Jiří - Kobera, Libor
Synthesis and properties of hyperbranched polyimides combined with silica.
Macromolecular Symposia. Roč. 295, č. 1 (2010), s. 88-93. ISSN 1022-1360.
[Prague Meetings on Macromolecules /73./ New Frontiers in Macromolecular Science: From Macromolecular Concepts of Living Matter to Polymers for Better Quality of Life. Prague, 05.07.2009-09.07.2009]
R&D Projects: GA AV ČR IAA400500602
Institutional research plan: CEZ:AV0Z40500505
Keywords : hyperbranched polyimides * silica * sol-gel process
Subject RIV: CD - Macromolecular Chemistry

The novel hyperbranched polyimide - silica hybrid materials containing theoretically 16 wt% of an inorganic phase were prepared via a sol-gel process. An amine terminated polyimide precursor (hyperbranched polyamic acid) was prepared from commercially available monomers 4,4′,4"-triaminotriphenylmethane and 4,4′-oxydiphthalic anhydride in molar ratio 1:1. Tetramethoxysilane and/or 3-glycidoxypropyltrimethoxysilane (also used as a coupling agent) were used as silica precursors. During thermal exposition the polyimide precursor was transformed to hyperbranched polyimide and hydrolyzed alkoxy groups reacted mutually to form silica. The final products were self-standing films, whose structure was characterized by using IR and 13C and 29Si solid state NMR spectroscopy. The influence of the amount of silica and/or coupling agent on their structure and thermal properties was described.
Permanent Link: http://hdl.handle.net/11104/0238940