Synthesis of norbornene/divinylbenzene copolymers catalyzed by anilinonaphthoquinone-ligated nickel complexes and their applications for the synthesis of graft polymers |
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Authors: | Samiul Islam Chowdhury Ryo Tanaka Yuushou Nakayama Takeshi Shiono |
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Institution: | Graduate School of Engineering, Hiroshima University, Hiroshima, Japan |
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Abstract: | The copolymerization of norbornene (NB) and divinylbenzene (DVB) was carried out using anilinonaphthoquinone-ligated nickel complexes of the type Ni(C10H5O2NAr)(Ph)(PPh3)] ( 1a : Ar = C6H3-2,6- iPr; 1b : Ar = C6H2-2,4,6-Me; 1c: Ar = C6H5) with modified methylaluminoxane (MMAO) as a cocatalyst. The DVB content was varied (5–25 mol%) and the resulting copolymers exhibited number-average molecular weights (Mn) of 40,000–69,000 g/mol with polydispersities (PDI = 1.5–1.8). The styryl group of the NB/DVB copolymer was used for grafting poly(methyl methacrylate) by reverse atom transfer radical polymerization using azobisisobutyronitrile in the presence of copper chloride and bipyridine. |
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Keywords: | copolymerization divinylbenzene graft polymerization nickel catalyst norbornene |
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