Idriss Blakey - Use of 9,10-diphenylanthracene as a contrast agent in chemiluminescence imaging: The observation of spreading of oxidative degradation in thin polypropylene films

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  Blakey, I.; Billingham, N.; George, G. A., Polym. Degrad. Stab.   2007, 92 (11), 2102-2109.



  Thin films of polypropylene were doped with a chemiluminescence   (CL) activator, 9,10-diphenylanthracene (DPA), and were thermally   oxidized in a CL imaging app. to det. whether heterogeneous   oxidn. processes such as spreading of oxidn. could be obsd. The   presence of DPA resulted in significantly more intense CL images   compared with undoped polymer, due to the efficient chem. induced   electron exchange luminescence reaction between DPA and   hydroperoxides. Hence, the CL images from DPA-doped PP were used   to locate the position of hydroperoxides in the oxidizing   polymer. For thermal oxidn. at 150 and 140 DegC hydroperoxides   were obsd. to form in localized regions of the films, while other   areas remained hydroperoxide free. As the oxidn. time increased   the concn. of hydroperoxides in these areas increased and they   were obsd. to spread to the remainder of the polymer.   Time-resolved line maps from the images indicated that zones with   high concn. of hydroperoxides travel through the polymer during   oxidn. Integrals of CL images from the thermal oxidn. of   DPA-doped polymers indicated that a significant degree of oxidn.   had occurred by the end of the "induction period" for a   conventional CL-intensity oxidn.-time profile. This is a likely   reason why spreading of oxidn. was not previously obsd. for   undoped PP films.

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