Porous polymer
Porous polymers are a class of porous media materials in which monomers form 2D and 3D polymers containing angstrom- to nanometer-scale pores formed by the arrangement of the monomers. They may be either crystalline or amorphous. Subclasses include covalent organic frameworks, hydrogen-bonded organic frameworks, metal-organic frameworks, and porous organic polymers. The subfield of chemistry specializing in porous polymers is called reticular chemistry.