Jiang Jianming
2009
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China Plastics
Abstract
A novel fluorinated diamine monomer,1,4-bis[4-amino-2-(trifluoromethyl)phenoxy]cyclohexane,was synthesized via two steps using 2-chloro-5-nitrobenzotrifluoride and 1,4-cyclohexanediol as the starting materials,which was subsequently employed to prepare a series of fluorinated aromatic polyamides with various aromatic acids,terephthalic acid,isophthalic acid,4,4′-oxydibenzoic acid,and 2,2′-bis(4-carboxy-phenyl)hexafluoropropane.The inherent viscosities of the resulted polyamides were in range of 0.89~1.29 dL/g,and they exhibited excellent solubility and optical property.They could be readily dissolved in not only strong polar solvents such as N-methy-2-pyrrolidone,N,N′-dimethylacetamide,and N,N′-dimethyl formamide,but also in some low-boiling-point solvents such as tetrahydrofuran,chloroform,and dichloromethane.The film prepared from these polyamides was colorless and transparent,with a UV-vis absorption edge between 335 nm and 357 nm.Furthermore,the polyamides also showed good thermal properties.The temperature of 10 % weight loss was 330~364 ℃ under nitrogen atmosphere.The glass-transition temperatures(Tg) were in the range of 202~223 ℃.