Highly Soluble Polyimide Based on Asymmetric Diamines Containing Trifluoromethyl Group for High Performance Dielectric Material
- Highly Soluble Polyimide Based on Asymmetric Diamines Containing Trifluoromethyl Group for High Performance Dielectric Material
- 구본철; 유남호; 고문주; 봉세화; 여현욱
- polyimide; dielectric constant; solubility; trifluoromethyl groups; thermal stability; polymer optics; refractive index
- Issue Date
- Macromolecular research
- VOL 26, NO 1-91
- In this study, we report the newly synthesized asymmetric diamine monomers and polyimides (PIs). The new diamines containing a trifluoromethyl group, 4- (4-amino-3-(trifluoromethyl)phenoxy)-2,6-dimethylaniline (ARFPA) and 4-(4-amino- 2-(trifluoromethyl)phenoxy)-2,6-dimethylaniline (ALFPA) were synthesized by the nucleophilic aromatic substitution reaction, followed by reduction of nitro groups. The new PIs were synthesized by the conventional polycondensation from the newly synthesized diamines and 6FDA (4,4'-(hexafluoroisopropylidene)diphthalic anhydride). The all PI films showed the improved thermal stability (a temperature of 5% loss in weight) in the range of 523-562 °C and high glass transition temperature (T g >307 °C). The all PIs also exhibited good solubility in several solvents including chloroform, dimethyl sulfoxide, ethyl acetate, and acetone. Additionally, the PIs showed a low refractive index (1.5470-1.5475 at 637 nm)
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