Novel soluble propargylether-terminated ester-imide prepolymers: I. Their syntheses and characteristics

Novel ester-imide prepolymers terminated by 3-(4-aminophenoxy)-propane-1-yne (4-APE) as a thermally curable group were successfully synthesized. The practical preparation route for CAFE via tosylate (2) is newly developed. Prepolymers were prepared from bisphenol-A bis(trimellitate)dianhydride (ESDA) having an ester moiety of dianhydride, aromatic diamine, and 4-APE. The properties of the cured resins of the prepolymers were evaluated and showed excellent mechanical and thermal properties, i.e. flexural strength of 269-370 MPa and T-g's Of 225-269 degreesC. Moisture absorption of 0.20-0.78%, and dielectric constants of 3.0-3.2 were also measured.