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Synthesis and characteristics of organic soluble photoactive polyimides
Author(s) -
Ho BangChein,
Lin YehSen,
Lee YuDer
Publication year - 1994
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994.070531113
Subject(s) - polyimide , tetrahydrofuran , acetone , dimethylacetamide , polymer chemistry , dimethylformamide , glass transition , aqueous solution , polymer , chemistry , materials science , organic chemistry , solvent , layer (electronics)
Soluble aromatic polyimides with inherent viscosities of 0.23–0.50 dL/g have been synthesized from 2,2‐bis(3‐amino‐4‐hydroxyphenyl) hexafluoropropane (BAPAF) and various aromatic tetracarboxylic dianhydrides. Almost all polyimides were soluble in a wide range of organic solvents, i.e., acetone, m‐cresol, N,N ‐dimethylacetamide, N,N ‐dimethylformamide, N,N ‐dimethylsulfoxide, N ‐methyl‐2‐pyrolidone, methyl ethyl ketone, and tetrahydrofuran (except that polyimide deriven from 3,3′,4,4′‐biphenyl tetracarboxylic dianhydride). Synthesized polyimides have a glass transition temperature in a range of 293 to 355°C, showing no appreciable weight loss up to 400°C in both air and nitrogen. These soluble polyimides exhibit high transparency in the UV visible region, with water absorption being between 3.6 to 5.7 wt %. They provide an aqueous base developable positive photoresist system when formulated with diazonaphthoquinone sensitizer. On the other hand, negative photoactive polyimides which are soluble in common organic solvents and optically transparent at a light of 365 nm wavelength, being obtained by reacting these soluble polyimides with methacryloyl chloride. Properties and characteristics of both positive and negative photoactive polyimides have been studied here. © 1994 John Wiley & Sons, Inc.