Synthesis and photodegradation of positive working polyimides derived from 2-nitro-p-xylyleneoxyamine

摘要

Two kind of diamines, 2-nitro-p-xylyleneoxyamine (5a) and p-xylyleneoxyamine (5b) were synthesized and used as monomers together with various tetracarboxylic dianhydrides to prepare the main-chain photodegradative polyimides which exhibited a positive working image upon light irradiation. The photosensitivities of the polyimides and the viscosities of their precursors on irradiation indicated that the nitro group substituted at the ortho position of the benzene ring of the diamine moiety improved the photolytic decomposability of polymers by at least 1-2 orders of magnitude compared with the hydrogen at the same position.