Synthesis and Properties of Fluoro-Polyetherimides

A series of amorphous fluoro-polyetherimides based on 2,2'-bis(3,4-dicarboxyphenyl) hexafluropropane dianhydride (6FDA) and di-ether-containing diamines 4,4'-bis(3-aminophenoxy)diphenyl sulfone (m-SED), 4,4'-bis(4-aminophenoxy)diphenyl sulfone (pSED), 4,4-bis(4-aminophenoxy)diphenyl propane (BPADE) were synthesized. These melt processable polyetherimide polymers from pSED and BPADE showed excellent electrical properties. The dielectric constants, 2.74 and 2.65 at 10 MHz respectively, are lower than commercially available polyetherimide ULTEM@ 1000, and polyimide Kapton@ H films. In addition, we found that trifluoromethyl groups-containing polyimides not only show extraordinaxy electrical properties, but they also exhibit excellent long-term thermo-oxidative stability and reduced water absorption relative to non-fluorinated polyimides. The weight retention of these fluoro-polyetherimides at 3 15°C for 300 h in air varies from 93% to 98%. Whereas, their moisture absorption at 100 RH at 50°C was in the range of 0.3% to 1.05%, which is much lower than those of Ultem 1000 and Kapton H. In the case of fluoro-polyetherimides from pSED and m-SED @ara and meta isomers) diamines with 'ether' and sulfonyl (-SO,-) spacer groups, the d-spacing and Tg values decreased from 4.7d to 4.56A and 293°C to 244°C respectively. Similarly, the transparency of these polymer films (in the range of 80% to 90%) at 500 nm solar wavelength was higher than Ultem 1000 and Kapton H. 1. I"R0DUCTION romatic polyimides possess outstanding thermal A mechanical and electrical properties as well as excellent chemical resistance (1). The search for new polyimides with improved processability and higher glass transition temperatures (TJ than the commercially available polyetherimide Ultem 1000 has received significant attention from both academia and industries. It is also known that structural rigidity of dianhydrides contributes to the increase in the glass transition temperatures of those polyimides in the range of 300 to 400°C. Therefore, because of their poor solubility in common organic solvents and high softening temperatures, uses of these polymers in industrial applications are limited. Because of these

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