Ajay Kumar Bunha

University of Houston, Houston, Texas, United States

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Publications (1)4.61 Total impact

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    ABSTRACT: A novel route to synthesize catenated macrocyclic PS-PMMA block copolymers is demonstrated via combination of supramolecular chemistry and controlled radical polymerization (CRP). Polymerization of styrene with bromopropionate ester initiator coupled with phenanthroline Cu(I) complex affords a four arm PS macroinitiator, which upon further chain extension by polymerization of MMA generates a four arm PS-PMMA block copolymer. Intramolecular coupling of PS-PMMA-Br arms via low temperature styrene-assisted atom transfer radical coupling (ATRC) leads to the formation of PS-PMMA catenand, which generates the metal-free catenated macrocyclic PS-PMMA block copolymer after removal of Cu metal. The interlocked structures of catenated block copolymers are confirmed by GPC, NMR, and AFM image analysis.
    Macromolecular Rapid Communications 07/2012; 33(14):1214-9. DOI:10.1002/marc.201200043 · 4.61 Impact Factor