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A high-performance positive-working photosensitive polyimide: Effects of reactive end groups on the physical properties of the films

Authors

  • Myung-Sup Jung,

    1. Materials Center, Samsung Advanced Institute of Technology, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-712, Korea
    2. Department of Chemical and Biomolecular Engineering, Center for the Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea
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  • Won-Jae Joo,

    1. Materials Center, Samsung Advanced Institute of Technology, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-712, Korea
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  • Ohyun Kwon,

    1. Materials Center, Samsung Advanced Institute of Technology, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-712, Korea
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  • Byung H. Sohn,

    1. Materials Center, Samsung Advanced Institute of Technology, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-712, Korea
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  • Hee-Tae Jung

    Corresponding author
    1. Department of Chemical and Biomolecular Engineering, Center for the Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea
    • Department of Chemical and Biomolecular Engineering, Center for the Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea
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Abstract

To investigate the effects of reactive end-cappers on the performance of PI precursors and the resulting polyimide (PI) films, poly(amic acid)s (PAAs) as a base polymer of the positive-working photosensitive polyimides (PSPIs) were synthesized via ring-opening polymerization of 4,4′-oxydiphthalic anhydride and 4,4′-oxydianiline with four different reactive end-cappers [maleic anhydride, citraconic anhydride, 2,3-dimethylmaleic anhydride (DMA), and 5-norbornene-2,3-dicarboxylic anhydride (NDA)]. During imidization of these end-capped PAAs to form the corresponding PI films, chain extension and crosslinking reactions of the respective end groups occurred, resulting in an improvement in the mechanical and thermal properties despite the low molecular weight of the precursors. However, the UV transmittance at ˜365 nm, an important property of PSPIs for thick-film applications, such as stress buffer layers, was strongly influenced by the type of end-capper used. These behaviors were understood in terms of the optimized geometries and the simulated UV–vis spectra of modeled end groups determined from density functional theory calculations. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102:2180–2188, 2006

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