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Ni(acac)_(2)Mediated vinyl polymerization of Norbornene in the Presence of Bulky Salicylaldiminate Ligands:An Effective Strategy to Access Soluble Polynorbornenes

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Chinese Journal of Polymer Science 2023年第3期41卷 356-364,I0006页

作者： Liang Fang Chun-Yu Zhang Xue-Quan Zhang Xian-De Shen Heng Liu Toyoji Kakuchi Research Center for Polymer Materials School of Materials Science and EngineeringChangchun University of Science and TechnologyChangchun 130022China Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-PlasticsQingdao University of Science&TechnologyQingdao 266061China Division of Applied Chemistry Faculty of EngineeringHokkaido UniversitySapporoHokkaido 060-8628Japan

Late transition metals have long served as workhorses for vinyl polymerization of norbornene ***,for such catalytic systems,insoluble polynorbornene(PNB)products are often produced which hampers their further detailed characterizations,such as molecular weights,polydispersities,stereoregularities,*** this work,we surprisingly found that for a traditional Ni(acac)_(2)/MAO system that was previously reported to give insoluble PNBs,incorporation of highly bulk salicylaldiminate ligands could significantly improve the solubility of the PNBs in common organic solvents,which allowed for subsequent thorough detailed analysis of the polymer ***,it was also observed that high-temperature polymerization was beneficial for further improving the PNB’s solubilities due to the decreased molecular weights and *** ligand skeletons and ligand equivalents were also investigated to give a comprehensive view of their influences on the polymers’solubilities,and based on these results,a plausible mechanism that caused such a big difference was tentatively proposed.

关键词： Polynorbornene Salicylaldiminate ligand vinyl polymerization

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SYNTHESIS AND CHARACTERIZATION OF BIS-[2-[[(2-ALKOXYPHENYL)IMINO]METHYL]-PHENOLATO-O,N,O]NICKEL(II)COMPLEXES AND THEIR NORBORNENE polymerization

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Chinese Journal of Polymer Science 2005年第6期23卷 619-626页

作者： Dong-heng Zhang Su-yun Jie Hai-jian Yang Fei Chang and Wen-hua Sun Key Laboratory of Engineering Plastics,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100080,China Chinese Acad Sci Inst Chem Key Lab Engn Plast Beijing 100080 Peoples R China

A series of salicylaldimines, synthesized in high yield via microwave-assisted condensation of salicylaldehyde and 2-alkoxyaniline were allowed to react with nickel chloride to form six-coordinated nickel complexes. These nickel complexes were carefully characterized, and the solid structure of la was elucidated by X-Ray diffraction. Activated with MAO, the nickel complexes showed good activity for homopolymerization of norbornene. Reaction parameters, such as the ratio of nickel precursor to MAO, monomer concentration, reaction time and the reaction temperature, as well as the nature of the ligands were found to have significant effects on the catalytic activity and some properties of the resulting polynorbornene.

关键词： Salicylaldirnine Nickel complex Norbornene vinyl polymerization

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