

FOLLOWUS
a.Tianjin Key Lab of Composite & Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin 300350, China
b.Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
c.School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
d.Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
lilypan@tju.edu.cn
Received:18 April 2019,
Revised:2019-5-7,
Accepted:14 May 2019,
Online First:27 June 2019,
Published:2019-12
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Guo, L.; Zhang, Y. P.; Mu, H. L.; Pan, L.; Wang, K. T.; Gao, H.; Wang, B.; Ma, Z.; Li, Y. S. Efficient addition polymerization of norbornene with polar norbornene derivatives by neutral nickel(II) catalysts. Chinese J. Polym. Sci. 2019, 37, 1215–1223.
Ling Guo, Yan-Ping Zhang, Hong-Liang Mu, et al. Efficient Addition Polymerization of Norbornene with Polar Norbornene Derivatives by Neutral Nickel(II) Catalysts[J]. Chinese Journal of Polymer Science, 2019, 37(12): 1215-1223.
Guo, L.; Zhang, Y. P.; Mu, H. L.; Pan, L.; Wang, K. T.; Gao, H.; Wang, B.; Ma, Z.; Li, Y. S. Efficient addition polymerization of norbornene with polar norbornene derivatives by neutral nickel(II) catalysts. Chinese J. Polym. Sci. 2019, 37, 1215–1223. DOI: 10.1007/s10118-019-2292-2.
Ling Guo, Yan-Ping Zhang, Hong-Liang Mu, et al. Efficient Addition Polymerization of Norbornene with Polar Norbornene Derivatives by Neutral Nickel(II) Catalysts[J]. Chinese Journal of Polymer Science, 2019, 37(12): 1215-1223. DOI: 10.1007/s10118-019-2292-2.
A series of nickel complexes {
4a
: [(2
6-
i
Pr
2
C
6
H
3
)N=CHC
16
H
12
O]Ni(Me)(Py)
4b
: [(2
6-
i
Pr
2
C
6
H
2
OCH
3
)N=CHC
16
H
12
O]Ni(Me)(Py)
4c
: [(2
6-
i
Pr
2
C
6
H
2
Cl)N=CHC
16
H
12
O]Ni(Me)(Py)
and
4d
: [(2
6-
i
Pr
2
C
6
H
2
CF
3
)N=CHC
16
H
12
O]Ni(Me)(Py)} based on
β
-ketiminato ligands bearing various electron-donating or electron-withdrawing substituents on the
para
-position of the aniline group were synthesized and unambiguously characterized. The X-ray crystallographic analysis showed that complexes
4b
and
4d
adopted a near-square-planar geometry
and the anilines bearing a
para
-OMe or ―CF
3
group were found to situate on the axial position of the metal center. All complexes exhibited high activities up to 1.25 × 10
7
–1.35 × 10
7
g
PNB
·mol
Ni
–1
·h
–1
toward norbornene (NBE) addition polymerization (conversion
>
91.2% in 2 min) under low loading of B(C
6
F
5
)
3
(B/Ni = 3) at 30 °C
affording polymers with high molecular weight up to 2.54 × 10
6
–3.18 × 10
6
. Different levels of decrease in catalytic activities could be observed for all catalysts as the reaction temperature increased;
4d
bearing a strong electron-withdrawing ―CF
3
group showed the highest activity at 70 °C
while others exhibited notable decrease in catalytic activity with the raise in reaction temperature. Complexes
4a
–
4d
showed remarkable tolerance to polar groups and could efficiently promote the copolymerization of NBE with its polar derivatives
including NBE bearing small acetate and hydroxyl group
as well as bulky oligomers
yielding copolymers with high functional NBE incorporations. Novel NBE copolymers with high functional comonomer incorporations and improved solubility were obtained in high yields.
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