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High Performance Polymers
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Organo-Soluble Fluorinated Polyimides Derived from Bis-Trifluoromethyl-Substituted Aromatic Diamines and Various Aromatic Dianhydrides

Jin-Gang Liu

Xiao-Juan Zhao

Hong-Shen Li

Lin Fan

Shi-Yong Yang

Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China, public305{at}iccas.ac.cn

A new diamine monomer with bis-trifluoromethyl-substituted phenyl in the side chain, {alpha},{alpha}-bis (4-amino-3,5-dimethylphenyl)-3',5'-bis(trifluoromethyl)phenyl methane (6FMA) was successfully synthesized. A series of fluorinated polyimides (PI-IIa-d) were prepared by reacting the diamine with various aromatic dianhydrides. For comparison, another series of polyimides (PI-Ia-d) derived from another diamine with single-trifluoromethyl-substituted phenyl in the side chain, {alpha},{alpha}-bis(4-amino-3,5-dimethylphenyl)-3'-trifluoromethyl phenyl methane and the same dianhydrides were also synthesized. The polymers were characterized by inherent viscosity, elemental analysis, Fourier transform-infrared, X-ray, ultraviolet-visible analysis, moisture absorption, thermogravimetric analysis, and differential scanning calorimetry measurements. It was shown that PI-II polyimides exhibited good film formability, enhanced solubility, good thermal stability, superior optical transparency, and acceptable mechanical properties. In addition, the polyimides derived from 3,3',4,4'-benzophenone tetracarboxylic dianhydride and 6FMA showed high sensitivity to i-line (365 nm) of a high-pressure mercury lamp. The combined properties of the polyimides make them good candidates for microelectronic fabrications.

Key Words: Polyimides • trifluoromethy • solubility • optical transparency

This version was published on December 1, 2006

High Performance Polymers, Vol. 18, No. 6, 851-865 (2006)
DOI: 10.1177/0954008306063639
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