The results obtained at 25 ◦C 60%RH were more surprising. Indeed, at T0 + 3 months and at T0 + 6 months, 2 peaks (m/z = 231 and m/z = 245) are visible (Fig. 4(a)). However, at T0 + 12 months, only the peak defined by m/z = 245
(MACB) is visible on the mass spectrum (Fig. 4(b)). The peak at m/z = 231 is practically non-existent. The dispersion
of a small quantity ofMACB(around 2 mg) on approximately 2 cm2 polypropylene and storage for 1 week at 40 ◦C 75%RH
showed effective migration of the benzophenone into the plastic (yellowing and determination of a peak at m/z = 245 (Fig. 5)). No m/z = 231 peak was observed under these conditions.