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Chen Dianbao, Liang Yuhua, He Zhaoping, Zhong Chongqi, Tang Xueming. MAGNETIC ANALYSIS OF NICKEL CATALYST SYSTEM FOR BUTADIENE POLYMERIZATION[J]. Chinese Journal of Applied Chemistry,
;1992, 9(5): 50-55.
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The magnetisms of both the common nickel catalyst system, Ni(naph)2-Al(i-Bu)3-BF3OEt2-C4H6, and modified nickel catalystlsystems, Ni(naph)2-AI(i-Bu)2(OR)-BF3OEt2-C4H6(-OR is -OPh, -OPhCH3, -OPhC8H18, and -OC8H17), were measured. The order of the reducibility of the coeatalysts in the nickel catalyst systems as follows:Al(i-Bu)3 > Al(i-Bu)2(OPhC8H17) > Al(i)-Bu)2(OPhCH3) > Al(i-Bu)2(OPh) > Al(i-Bu)2(OC8H17).For Ni(naph)2-Al(i-Bu)2(OC8H17)-BF3OEt2 system, Ni(Ⅱ) was mainly reduced to Ni (Ⅰ), during the pdynierization reation while Ni(Ⅰ) and Ni(0) were round in coexistence for other nickel catalyst systems. The aggregation of Ni(0) in Ni(naph)2-Bd-At(i-Bu)2(OPh) and Ni(naph)2-Bd-Al(i-Bu)2(OPhCH3) systems was ferromagnetic, and it was paramagnetic in other systems.
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