A supramolecular polymer is a polymer whose monomer repeat units are held together by noncovalent bonds.Non-covalent forces that hold supramolecular polymers together includecoordination, π-π interactions, and hydrogen bonding. One system thathas been demonstrated uses quadruple hydrogen bondsto form supramolecular polymers. Functionalization of polymers with thequadruple hydrogen bonding unit from the Meijer group introducesreversible cross-links and a virtual increase in the polymer’smolecular weight. In general, polymers with a higher molecular weightpossess better material properties.