A self-sensitizing negative polyimide precursor and a method for preparing the same, and use thereof. 4,4-dinitro-1,1-biphenyl-2,2-dicarboxylic acid is used as a starting material and undergoes an acylation reaction with thionyl chloride to afford compound 1. Compound 1 subsequently undergoes an esterification reaction with 2-hydroxyethyl methacrylate to afford compound 2. The nitro groups of compound 2 are then reduced to amino groups; after purification, an intermediate of the self-sensitizing negative polyimide precursor is obtained. The intermediate is polymerized with 3,3,4,4-benzophenone tetracarboxylic dianhydride to give a polyamic acid, namely the self-sensitizing negative polyimide precursor. Because the intermediate contains a benzophenone moiety, ultraviolet irradiation can generate free radicals, allowing the intermediate to act intrinsically as a photoinitiator. The dual photosensitive properties of the ketone carbonyl and double bond in the self-sensitizing negative polyimide precursor material provided by the present application can improve the exposure sensitivity of the resin.

Branched amorphous polyamide (co)polymers having a backbone formed by reacting a reaction mixture including at least 25 mol % of a di-amine selected from a secondary di-amine, a branched di-amine, or a combination thereof; and an aliphatic acid blend including a branched aliphatic dimer acid and a branched aliphatic trimer acid. The molar equivalent ratio of the di amine to the aliphatic acid blend is 0.9-1.1. Preferably, the branched amorphous polyamide (co)polymer is not telechelic. The branched amorphous polyamide (co)polymer preferably exhibits one or more of a shear modulus of from 10,000 to 500,000 Pa at 70 C., a complex viscosity of greater than 1,000,000 mPa*s at 70 C., a glass transition temperature of less than 25 C., or a number average molecular weight of greater than 10,000 Da. Biodegradable and/or compostable adhesive articles including the branched amorphous polyamide (co)polymer also are disclosed.