Highly active and thermo-stable iminopyridyl vanadium oxychloride catalyzed isoprene polymerization |
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Authors: | Mengmeng Zhao Liang Wang Qaiser Mahmood Chuyang Jing Guangqian Zhu Xianhui Zhang Xiao Chen Qinggang Wang |
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Affiliation: | 1. Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China;2. Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China Center of Materials Science and Optoelectronics Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing, China |
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Abstract: | Stereoregular polymerizations are of high importance, which disclosing the relationships between microstructures and physical properties of polymers. In this contribution, a series of iminopyridyl vanadium oxychloride complexes V1 – V8 (R = H, R1 = CH2Ph for V1 ; R = H, R1 = CHPh2 for V2 ; R = H, R1 = octamyl for V3 ; R = H, R1 = Ph for V4 ; R = H, R1 = 4-OMe-C6H4 for V5 ; R = H, R1 = 4-CF3 C6H4 for V6 ; R = H, R1 = 2,4,6-Ph3 C6H2 for V7 and R = Me, R1 = Ph for V8 ) have been prepared, and were investigated for their catalytic capacity of isoprene polymerization. A single crystal structure of V7′ was reported, which was reduced from V(v) to V(iv) in the oxidation state of vanadium central atom. The catalytic activity was up to 408 kg (mol V)−1 hr−1, when V4 was used. The catalyst V6 was found to be highly thermo-stable with excellent activity even at 100°C. Most importantly, resultant polymers mainly possessed cis-1,4 units (up to 75%) with 25% side-chain 3,4 functional group, which is particularly important component to enhance the application of these synthetic rubbers. |
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Keywords: | cis-1,4-polyisoprene high thermo-stable iminopyridine ligand isoprene polymerization vanadium complex |
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