Vinylic copolymerization of norbornene and higher 1-alkene with three-dimensional geometry binickel catalyst

Abstract

Compared with monometallic complex, the threedimensional geometry α-diimine binickel complex exhibited higher activities (5.5×10 5 -2.7×10 7 g polymer /mol Ni ·h) in the homopolymerization of norbornene and copolymerization of norbornene with 1-hexene or 1-decene in the presence of B(C 6 F 5 ) 3 . The 1-hexene or 1-decene content in the copolymers could be controlled up to 9.2-25.3 % or 8.8-17.8 % by varying the comonomer feed ratios 1-hexene or 1-decene from 10 to 50 %. It was observed that the yield depended on the kind of 1-alkene and improved with increasing the length of 1-alkene. The obtained poly(NB-co-1-hexene)s and poly(NBco-1-decene)s exhibited high thermal stability and high glass transition temperature, together with high molecular weight. In addition, copolymers showed good solubility in common organic solvents and could be processed into films by solution casting method, which showed good transparency in the visible region.

Vinyl-type homo- and copolymerization of norbornene catalyzed by bis(phenoxyimine) titanium complex

“…Alkylaluminium is usually used as cocatalyst in organometallic catalytic systems for alkylation and removing impurities, and organoboron compounds are extensively applied in the polymerization of NBE to form a cationic active center . Therefore, complex 1 , TIBA and B were chosen as components of the ternary catalytic system for the homopolymerization of NBE.…”

Coordination‐Insertion Copolymerization of Norbornene and p‐Substituted Styrenes Using Anilinonaphthoquinone‐Ligated Nickel Complexes

“…The properties of cycloolefin copolymers (COCs), commercially produced via copolymerization of N with ethylene (E), can be easily controlled by comonomer content and sequence distribution 6–8. Copolymerization of N with higher 1‐alkenes was also reported to modify the physical properties 9,10. To reduce the birefringence of PNB with controlled T g value, some research groups including us reported the incorporation of styrene (S) into PNB main chain by copolymerizing N and S 11–13.…”

Bis-(salicylaldehyde-benzhydrylimino)nickel complexes with different electron groups: crystal structure and their catalytic properties toward (co)polymerization of norbornene and 1-hexene

“…However, the further development of norbornene is hampered by its poor bond properties, low solubility and poor mechanical properties. At present, the introduction of polar groups [18][19][20] or exible chains [21][22][23][24][25] on the norbornene backbone is the most effective means to solve this problem. In order to achieve this goal, it is important to synthesize some efficient catalysts.…”

“…Norbornene is a typical cycloolen with many advantages of cycloolens, but due to the presence of bicyclic skeletons in the polymer, it is brittle and has a small elongation at break. In order to improve its defects, the copolymer obtained by copolymerizing norbornene with a-olen 22,23,36 not only can reserve the heat resistance and dimensional stability of polynorbornene, but also has excellent optical properties, good processing and solubility, which has attracted scholars's attention at both home and abroad. For example, Kaminsky group 37 achieved the copolymerization of norbornene with ethylene using a metallocene catalyst.…”