Macromolecules, Vol.45, No.1, 70-77, 2012
Facile Synthesis of Flexible, Donor Acceptor Side-Chain Functionalized Copolymers via Ring-Opening Metathesis Polymerization
A series of polymers has been synthesized via ring-opening metathesis polymerization of donor acceptor side-chain finictionalized monomers. The backbones of the polymers are based on poly(norbornene)s and/or poly(c-yclooctene)s, while the side-chains consist of electron-rich 1,5-dialkoxynaphthalene and electron-deficient 1,2,4,5-benzenetetracarboxylic dianhydride (pyromellitic dianhydride). The monomers were proven to be living which allowed for the generation of controlled homopolymers and block copolymers. Side-chain functionalized alternating poly(norbornene/c-yclooctene)s were generated using a Grubbs type initiator containing an unsymmetrical N-heterocyclic carbene ligand. Using UV vis spectroscopy, a charge transfer band was detected in random and alternating copolymer solutions due to intramolecular interactions.