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Nanostructured thermoplastic polyimide films

United States Patent

May 19, 2015
View the Complete Patent at the US Patent & Trademark Office
Structured films containing multi-walled carbon nanotubes ("MWCNTs") have enhanced mechanical performance in terms of strength, fracture resistance, and creep recovery of polyimide ("PI") films. Preferably, the loadings of MWCNTs can be in the range of 0.1 wt % to 0.5 wt %. The strength of the new PI films dried at C. increased by 55% and 72% for 0.1 wt % MWCNT and 0.5 wt % MWCNT loadings, respectively, while the fracture resistance increased by 23% for the 0.1 wt % MWCNTs and then decreases at a loading of 0.5 wt % MWCNTs. The films can be advantageously be created by managing a corresponding shift in the annealing temperature at which the maximum strength occurs as the MWCNT loadings increase.
Aglan; Heshmat (Tuskegee, AL)
Tuskegee University (Tuskegee, AL)
13/ 678,914
November 16, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under contract number DE-FG52-05NA27039 awarded by the Department of Energy. The U.S. government has certain rights in the invention.