Abstract: A polyimide material includes a polyimide of Formula (I) wherein A1 and A2 for each occasion independently are selected from a group of tetravalent moieties and B for each occasion independently is selected from a group of divalent moieties, wherein x is an integer greater than 1. The polyimide material has desirable optical, structural, thermal, mechanical properties, or combination thereof.

Abstract: The present disclosure describes methods of polyimide synthesis and polyimides made therefore. The method includes placing a tetracarboxylic compound and a solvent in a reaction vessel and adding a first amount of a diamine. The first amount of the diamine is not more than 99.5 mol % of the tetracarboxylic compound inside the reaction vessel. The method can include agitating the mixture and determining a viscosity of the mixture. The method can further include adding a second amount of the diamine. The last steps can be repeated until the viscosity increases to a target value. The target viscosity can be correlated to a peak weight-averaged molecular weight of the polyimide.

Abstract: The present disclosure relates to compositions derived from bioreachable molecules, such as amino acids and/or steroids. In particular, the composition can be a monomer, a polymer, or a copolymer derived from an amino acid dimer. Such compositions can optionally include a functionalized steroid.