Abstract
A pyrene-containing polyimide (p-PI) was synthesized from a diamine monomer and 4,4′-(Hexafluoroisopropylidene)diphthalic anhydride via one step polycondensation procedure. The polymer possessed good solubility due to the large rigid non-planar conjugated side groups. Therefore, the fluorescence test paper could be produced by a convenient method. The "turn-on" fluorescent response of the test paper to Fe3+ and Pb2+ was observed. In addition, this polymer possessed excellent thermal and thermooxidative stability. The onset decomposition temperatures (Td) of p-PI in O2 and N2 atmosphere were 431 and 442°C, respectively. There was a good linear relationship (R2 = 0.9943) of the p-PI film between fluorescence intensity and temperature from 298 to 408K. This polymer could be considered as fluorescence chemosensor for detecting metal ions and a temperature sensor for monitoring environment in the future.
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