Porous polymers are a class of porous media materials in which

monomer In chemistry, a monomer ( ; ''mono-'', "one" + '' -mer'', "part") is a molecule that can react together with other monomer molecules to form a larger polymer chain or three-dimensional network in a process called polymerization. Classification Mo ...

s form 2D and

3D polymers 3-D, 3D, or 3d may refer to: Science, technology, and mathematics Relating to three-dimensionality * Three-dimensional space ** 3D computer graphics, computer graphics that use a three-dimensional representation of geometric data ** 3D film, a ...

containing angstrom- to nanometer-scale pores formed by the arrangement of the monomers. They may be either crystalline or amorphous. Subclasses include

covalent organic framework Covalent organic frameworks (COFs) are a class of materials that form two- or three-dimensional structures through reactions between organic precursors resulting in strong, covalent bonds to afford porous, stable, and crystalline materials. COFs em ...

s (COFs),

hydrogen-bonded organic framework Hydrogen-bonded organic frameworks (HOFs) are a class of porous polymers formed by hydrogen bonds among molecular monomer units to afford porosity and structural flexibility. There are diverse hydrogen bonding pair choices that could be used in HOFs ...

s (HOFs), metal-organic frameworks (MOFs), and

porous organic polymer Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%. Strictly speaking, some tests measure ...

s (POPs). The subfield of chemistry specializing in porous polymers is called

reticular chemistry Omar M. Yaghi ( ar, عمر مونّس ياغي; born February 9, 1965) is the James and Neeltje Tretter Chair Professor of Chemistry at the University of California, Berkeley, the Founding Director of the Berkeley Global Science Institute, and an ...

Covalent organic frameworks

Covalent organic frameworks are crystalline porous polymers assembled from organic monomers linked through

covalent bond A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs. The stable balance of attractive and repulsive forces between atoms ...

Hydrogen-bonded organic frameworks

Hydrogen-bonded organic frameworks are crystalline porous polymers assembled from organic monomers linked through

hydrogen bond In chemistry, a hydrogen bond (or H-bond) is a primarily electrostatic force of attraction between a hydrogen (H) atom which is covalently bound to a more electronegative "donor" atom or group (Dn), and another electronegative atom bearing a ...

Metal-organic frameworks

Metal-organic frameworks are crystalline porous polymers assembled from organic monomers connected by

coordination Coordination may refer to: * Coordination (linguistics), a compound grammatical construction * Coordination complex, consisting of a central atom or ion and a surrounding array of bound molecules or ions * Coordination number or ligancy of a centr ...

to metal atom centers.

References

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