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ref: -0 tags: polyimide aqueous degradation kapton date: 01-22-2017 05:51 gmt revision:0 [head]

Aqueous degradation of polyimides

  • Above ph 2, Kapton (PMDA-ODA) test specimens decreased both tensile strength and elongation to break with water, with a rate that increased with temperature.
  • No samples completely degraded, however; tensile strength decreased by about 2x, and elongation from 30% to 5%.
  • The authors suspect that ortho (off-molecular axis) amide bonding, at about 0.6% of the total number of imide bonds, is responsible for this (otherwise the film would completely fall apart.)
  • Imide bonds themselves are robust to all but strong bases and acids.
  • See also {1253}.

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ref: work-0 tags: flexible kapton funny date: 05-12-2009 21:57 gmt revision:3 [2] [1] [0] [head]

-- from the Lenthor Engineering Design guide. Wow they are indeed everywhere!