Abstract:

5-Butoxymethylenyl-2-norbornene(NBE-CH2OC4H9) was synthesized. Polynorbornenes with functional groups were obtained by homo and copolymerizations of norbornene derivatives catalyzed by bis(β-ketonaphthylamino)Ni(Ⅱ)/B(C6F5)3 system. Influences on polymerizations by changing polymerization time and copolymerization monomer feed ratios was examined. The catalytic bis(β-ketonaphthylamino)Ni(Ⅱ)/B(C6F5)3 system exhibited higher catalysis activity. The obtained polymers were characterized by 1H NMR, FTIR and TGA. Results indicated that the incorporation rate could reach 22.1%~76.9% ether units at a molar fraction of 10%~90% of the NBE-CH2OC4H9 in the monomer feed ratios; the polymerizations are confirmed to be vinyl-addition mode. The polymer has a good thermal stability(Td＞360 ℃) and is soluble in many common solvents, such as THF and CHCl3.

Key words: addition polymerization, butoxymethylenylnorbornene, polynorbornene, Ni complex