Polyetherimide: A new high‐performance thermoplastic resin

Abstract

A new high‐performance amorphous thermoplastic, named polyetherimide, has been developed by the General Electric Company. This resin is characterized by high deflection temperature (200°C at 264 psi), high tensile strength and flexural modulus (480,000 psi), and very good retention of mechanical properties at elevated temperatures. In addition, the resin exhibits good electrical properties, which remain stable over a wide range of temperature and frequencies (including microwave). Polyetherimide is inherently flame resistant without the use of additives. It has a high limiting oxygen index of 47, combined with NBS smoke chamber results which show the lowest specific optical density of any unfilled thermoplastic (Dmax = 31). One synthetic method for the preparation of polyetherimides and a comprehensive property profile of the first member of this polymer family are presented.

Synthesis, Characterization and Material Application of Poly(Urea-Imide)s, Part 1

“…First, the nonaromatized DA product 3a-f is formed which is then aromatized by treatment of acetic anhydride to yield 4a-f. In the absence of bismaleimides (2a-f), heating of BFU (1) in 1,4-dioxane at 100 C does not alter the properties of BFU (1). It was also observed that heating of bismaleimides (2a-f) in 1,4-dioxane at 100 C does not induce the addition polymerization of bismaleimides (2a-f).…”

“…The introduction of linkages such as ether, amide, oxysilane, and ester to improve the processability of polyimides without major sacrifice in thermooxidative stability has received great industrial attention [1][2][3]. The above properties make copolyimides suitable for interlaminary insulation, protective coatings in microelectronics and also for preparation of flexible composites [1][2][3].…”

“…The above properties make copolyimides suitable for interlaminary insulation, protective coatings in microelectronics and also for preparation of flexible composites [1][2][3]. The merging of urea linkage and imide linkage into the polymer chain may offer highly thermally stable polymers.…”

Failure analysis of a polymer centrifugal impeller

“…1) a high performance amorphous thermoplastic, that is used for medical devices and pharmaceutical applications. This material typically shows exceptional mechanical properties, with a yield strength of 110 MPa and retention of mechanical properties at elevated temperatures [6].…”

Novel Polyimide System Based on Nitro Displacement/Diels-Alder Reactions

“…To avail the processable polyimide, several modifications [7] of polyimides has also been made without the dilution of properties of polyimides. One such area in which the poly(ether-imide)s formation by nitrodisplacement (ND) reaction has been well documented [8][9][10][11]. The formation of poly(ether-imide)s through simultaneous DA and ND reactions has not been reported.…”