Publication Details (including relevant citation information):
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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