Fig. 6. (a) FT-IR spectra of cured PI4 (1) prior to and (2) after photo-induced cleavage of the o-NBE links (85 J cm−2, λ < 400 nm, N2). (b) Following the photocleavage kinetics of the o-NBE links by FT-IR spectroscopy upon prolonged UV exposure: decrease of the normalized intensity of the nitro band at 1537 cm−1 in PI4 (solid squares), PI4-G5 (open diamonds) and PI4-G7 (open triangles).
