Positive Photoreactive Polyimides. II. Preparation and Characterization of Polyimide Precursors Containing α-(2-Nitrophenyl)ethyl Ester Side Chains |
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| Authors: | Shigeru Kubota Toshimoto Moriwaki Torahiko Ando Akira Fukami |
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| Institution: | Polymer Engineering Department , Materials and Electronic Devices Laboratory Mitsubishi Electric Corporation , 8-1-1 Tsukaguchi-honmachi, Amagasaki, 661, Japan |
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| Abstract: | The monomers were derived from pyromellitic dianhydride and α-(2-nitrophenyl)ethanol, which was prepared by selective reduction of 2-nitroacetophenone. Polyimide precursors were synthesized by an interfacial polycondensation technique. Their thermal properties in nitrogen were studied by dynamic thermogravimetry. The photore-arrangement of 2-nitrobenzyl ester having a methyl group at the α-position compared to that of the unsubstituted ester was investigated by infrared spectrophotometry. The polymers obtained in this study gave a high proportion of photorearrangement to show high sensitivity. The exposed areas dissolved in 2% aqueous KOH, forming high resolution patterns because they did not swell during the developing process. |
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| Keywords: | PET Bottle resin Acetaldehyde Acetaldehyde regeneration Injection molding Stretch-blow molding |
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