Synthesis and Characterization of Novel Hyperbranched Polyimides Based on Silsesquioxane Nanocomposite Networks

Authors : Turgay SEÇKİN, Ahmet GÜLTEK, Süleyman KÖYTEPE

Pages : 49-59

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :A series of nanosized polyimides was successfully prepared by condensation polymerization of an octaamino-functionalized silsesquioxane and a series of commercially available dianhyride monomers. The polymerization of the octaamino silsesquioxane was carried out in 1-methyl-2-pyrrolidone insert ignore into journalissuearticles values(NMP); at room temperature, giving polyinsert ignore into journalissuearticles values(amic acid); as precursor polymers that were readily converted to the corresponding polyimides by thermal treatment in the subsequent step, which is similar to the conventional 2-stage method. The appropriate molar ratio of the silsesquioxane monomer to a dianhyride was 1:1. These polyimides are readily soluble in polar aprotic solvents such as 1-methyl-2-pyrrolidone, and N,N-dimethylacetamide at room temperature, and show high thermal stability with a 10% weight loss, Td = 441 to 593 °C in N2.
Keywords : Polyimides, hybrid materials, nano materials, silsesquioxanes