Preparation and characterization of hyperbranched polyimides based on 4,4 ',4 ''-triaminotriphenyl-methane

作者：Sysel Petr^*; Minko Evgenia; Cechova Radana

来源：E-Polymers, 2009, 9(1): 081.

DOI：10.1515/epoly.2009.9.1.976

• hyperbranched polyimides
• 4,4,' 4 ''-triaminotriphenylmethane

This work focuses on the preparation and characterization of novel hyperbranched polyimides based on commercially available 4,4,'4 ''-triaminotriphenylmethane and pyromellitic dianhydride or 4,4'-oxydiphthalic anhydride. The bi- and trifunctional monomers were reacted in a molar ratio of 1:1 or 2:1 to prepare polyimide precursors (hyperbranched polyamic acids) end-capped with either amino or anhydride groups. The precursors were then transformed into hyperbranched polyimides using thermal imidization. The final products were self-standing films, whose thermal behaviour was characterized by having no weight loss up to 250 degrees C and by having glass transition temperatures above 200 degrees C. We monitored the permeability of carbon dioxide, organic vapours and water vapour through these membranes. We also compared the properties of these materials with linear polyimides based on 4,4'-methylenedianiline combined with either pyromellitic dianhydride or 4,4'-oxydiphthalic anhydride.

• 出版日期2009-6-21