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N,O-Chelated Ni(Ⅱ) Catalysts for Cycloolefin Copolymerization of High α-Olefin Contents
최성민,정현민,박준우,호린,김명진 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Novel N,O-chelated Ni(II) complexes, Ni{MeC(O)CHC[N(p-R-Ar)]}2, were synthesized with different substituted groups of aryl ring; -CF3 (Ni1), -CH3 (Ni2) and -OCH3 (Ni3). The structure of Ni complexes was characterized by a XRC. All Ni complexes have been investigated as catalyst for NB polymerization and copolymerization of NB with α-olefin. All Ni complexes exhibited high catalytic activity (1.56 - 2.82 × 10<sup>4</sup> g<sub>poly</sub>/mol<sub>Ni</sub>·h) in PNB and high catalytic activity (1.32 - 2.71 × 10<sup>4</sup> g<sub>poly</sub>⁄mol<sub>Ni</sub>·h)in COC. Ni1 with electron-withdrawing group performed the best catalytic activity (2.71 × 10<sup>4</sup> g<sub>poly</sub>⁄mol<sub>Ni</sub>·h) and highest insertion ratio of α-olefin (22.68%). The obtained COC were confirmed through <sup>1</sup>H-NMR analysis and the thermal properties were also determined by TGA. The results revealed that all COC were vinyl-addition COC with good thermal stability (T<sub>d</sub>>400 ℃) and high T<sub>g</sub> between 194 ℃ and 337 ℃. In addition, all COC showed good solubility in common organic solvents.