Bong, Sehwa Yeo, Hyeonuk Ku, Bon-Cheol Goh, Munju You, Nam-Ho 2024-01-19T23:34:20Z 2024-01-19T23:34:20Z 2021-09-03 2018-01 1598-5032 https://pubs.kist.re.kr/handle/201004/121872 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 A degrees C and high glass transition temperature (T (g) > 307 A degrees 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) as well as a low dielectric constant. English 한국고분자학회 Highly soluble polyimide based on asymmetric diamines containing trifluoromethyl group for high performance dielectric material Article 10.1007/s13233-018-6010-7 1 Macromolecular Research, v.26, no.1, pp.85 - 91 Macromolecular Research 26 1 85 91 N scie scopus kci ART002310739 000423604300013 2-s2.0-85034860705 Polymer Science Polymer Science Article AROMATIC DIANHYDRIDES CONSTANT POLYAMIDES FILMS polyimide trifluoromethyl groups polymer optics refractive index dielectric constant