<EM>N,O</EM>-chelated Ni(II) catalysts for cycloolefin copolymerization of high α-olefin contents
발표자
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초록
내용
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 × 104 gpoly/molNi·h) in PNB and high catalytic activity (1.32 - 2.71 × 104 gpoly⁄molNi·h)in COC. Ni1 with electron-withdrawing group performed the best catalytic activity (2.71 × 104 gpoly⁄molNi·h) and highest insertion ratio of α-olefin (22.68%). The obtained COC were confirmed through 1H-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 (Td＞400℃) and high Tg between 194℃ and 337℃. In addition, all COC showed good solubility in common organic solvents.