Heteroarm Star-Branched Block Copolymers
{'Code': '03070007', 'Directorate': {'Abbreviation': 'MPS', 'LongName': 'Direct For Mathematical & Physical Scien'}, 'Division': {'Abbreviation': 'DMR', 'LongName': 'Division Of Materials Research'}}
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Heteroarm star polymers contain n arms, of which x arms are                comprised of monomer A while n-x arms are comprised of monomer B.               These star-shaped polymers are organic materials of entirely new                chemical structure.  Recent theoretical work predicts they will                 exhibit unusual segregation and interphase phenomena.  Synthetic                procedures will be developed for preparation of these new                       materials with n = 3,4 with precisely defined architectures and                 for the attachment of special functional groups at the free ends                of the B arms.  The consequences of interarm interactions in                    isolated heteroarm stars will be assessed from the rates and                    equilibrium for macrocyclization, as deduced from excimer                       emission by molecules in which two arms bear pyrene at their free               ends.  Discrimination among the various types of interarm                       interactions that can occur in semidilute solution, melts, and in               the solid state will be determined with heteroarm stars                         selectively labelled for study of excimer emission or the rate of               nonradiative singlet-energy transfer.  The dynamics of isolated                 heteroarm stars, as well as their diffusion in concentrated                     solutions and melts, will be determined using pulsed-gradient                   spin-echo nuclear magnetic resonance.
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