The improved photosensitivity of photosensitive polyimides containing o-nitrobenzyl ether groups induced by the addition of photoacid generator

Gwang Sik Song, Youn Jung Heo, Jeong Ju Baek, Hyosun Lee, Geun Yeol Bae, Kyung Ho Choi, Won Gun Koh, Gyojic Shin

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In this article, photosensitive polyimides (PSPIs) with photosensitive groups, o-nitrobenzyl ether groups (Nb), were successfully synthesized based on 2,2′-dihydroxy benzophenone-3,3′,4,4′-tetracarboxylic dianhydride and on diamine containing ethylene glycol chains (ODA). Also, a series of polyimide (PI), ODA-1-PI, ODA-3-PI, and ODA-5-PI with a number of ethylene glycol chains of 1, 3, and 5 were prepared to investigate the relationship between structure and solubility. Interestingly, ODA-5-PI, which possesses a large number of ethylene glycols, exhibited the most excellent solubility. Therefore, due to the good solubility of ODA-5-PI in organic solvents and alkaline solutions, a PSPI, poly(1,4-phenyleneoxy-3,6,9,12,15-pentaoxaoctane-1,4-phenylene-2,2′-di[2-nitrobenzyloxy]benzophenone-3,3′,4,4′-tetracarboxdiimide), named ODA-5-PSPI, was synthesized by linking Nb, which is a photosensitive group. Aiming at producing positive tone patterns, the synthesized ODA-5-PSPI was exposed to UV irradiation and then to a post-exposure bake. Afterward, it was developed using a 2.38 wt% tetramethylammonium hydroxide solution. Furthermore, a photoacid generator (PAG) was additionally incorporated for a micropatterning process. Notably, in the presence of the PAG, the photocleavage of ODA-5-PSPI occurred not only by the intramolecular rearrangement of Nb but also by its hydrolysis reaction. As a result, due to the synergistic effect of photocleavage, the micropatterning of ODA-5-PSPI with PAG could be clearly obtained with less energy (2.0 J/cm2) compared with that without PAG (3.6 J/cm2). Therefore, through the addition of PAG, the photosensitivity was improved by 45%.

Original languageEnglish
Pages (from-to)340-352
Number of pages13
JournalJournal of Polymer Science
Issue number4
Publication statusPublished - 2021 Feb 15

Bibliographical note

Funding Information:
This study has been conducted with the support of the Korea Institute of Industrial Technology as “Development of eco-friendly production system technology for total periodic resource cycle (KITECH EO-20-0022)”.

Publisher Copyright:
© 2021 Wiley Periodicals LLC

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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