Two-sided comb poly(amic ester)-poly(propylene oxide) graft copolymers as porous polyimide precursors

Autor: Elena Lebedeva, Kenneth R. Carter, Brenda S. Kesler
Rok vydání: 2005
Předmět:
Zdroj: Journal of Polymer Science Part A: Polymer Chemistry. 43:2266-2275
ISSN: 1099-0518
0887-624X
DOI: 10.1002/pola.20698
Popis: New step-growth graft block copolymers were synthesized. These two-sided comb copolymers consisted of a poly(amic ester) (PAE) backbone and pendant poly(pro- pylene oxide) (PPO) grafts. The copolymers were made via a macromonomer approach, in which the 4,6-bischlorocarbonyl isophthalic acid bis(poly(propylene oxide)) ester mac- romonomer was synthesized through the reaction of hydroxyl-terminated PPO oligomers with pyromellitic dianhydride and oxalyl chloride. This macromonomer was subsequently used in step-growth polymerization with comonomers 4,6-bischlorocarbonyl isophthalic acid diethyl ester, 2,5-bischlorocarbonyl terephthalic acid diethyl ester, and 2,2-bis(4- (4-aminophenoxy)phenyl) hexafluoropropane, and this yielded PPO-co-PAE graft copoly- mers. Accordingly, we report the synthesis and characterization of the PPO oligomer, the PPO macromonomer, and their corresponding PPO-co-PAE graft copolymers. Graft copol- ymers with PPO concentrations of 3-26 wt % were synthesized. These polymers were thermally cured to produce polyimide/PPO composites. The thermolysis of these polyimide/ PPO composites yielded porous polyimide films with porosities ranging of 4 -22.5%. © 2005
Databáze: OpenAIRE
Externí odkaz: