Orthogonally self-assembled multifunctional block copolymers.
We report the synthesis of telechelic poly(norbornene) and poly(cyclooctene) homopolymers by ring-opening metathesis polymerization (ROMP) and their subsequent functionalization and block copolymer formation based on noncovalent interactions. Whereas all the poly(norbornene)s contain either a metal complex or a hydrogen-bonding moiety along the polymer side-chains, together with a single hydrogen-bonding-based molecular recognition moiety at one terminal end of the polymer chain. These homopolymers allow for the formation of side-chain-functionalized AB and ABA block copolymers through self-assembly. The orthogonal natures of all side- and main-chain self-assembly events were demonstrated by (1)H NMR spectroscopy and isothermal titration calorimetry. The resulting fully functionalized block copolymers are the first copolymers combining both side- and main-chain self-assembly, thereby providing a high degree of control over copolymer functionalization and architecture and bringing synthetic materials one step closer to the dynamic self-assembly structures found in nature.
Ambade
Ashootosh V
AV
Molecular Design Institute and Department of Chemistry, New York University, 100 Washington Square East, New York, NY 10003, USA.
Burd
Caroline
C
Higley
Mary Nell
MN
Nair
Kamlesh P
KP
Weck
Marcus
M
D034242:Cyclooctanes / Q000737:chemistry*; D006860:Hydrogen Bonding; D008670:Metals / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D010969:Plastics / Q000737:chemistry*
D034242:Cyclooctanes; D008670:Metals; D010969:Plastics; C071464:polynorbornen