Sequence and Regularity Controlled Coordination Copolymerization of Butadiene and Styrene: Strategy and Mechanism

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• 作者：Fei Lin ; Meiyan Wang ; Yupeng Pan ; Tao Tang ; Dongmei CuiBo Liu
• 刊名：Macromolecules
• 出版年：2017
• 出版时间：February 14, 2017
• 年：2017
• 卷：50
• 期：3
• 页码：849-856
• 全文大小：533K
• ISSN：1520-5835

文摘

The stereoselective and sequence controlled coordination copolymerizations of butadiene (BD) and styrene (St) with diblock, tapered, gradient, and random sequence distributions were achieved for the first time through varying the central metals of the rare-earth metal bis(alkyl) catalyst precursors (Flu-CH₂-Py)Ln(CH₂SiMe₃)₂(THF)_x (Flu = fluorenyl, Py = pyridyl, x = 1: Ln = Nd(1), Y(2), Tm(3); x = 0, Ln = Sc(4)). The thermal behavior, morphology, and the mechanical property of these copolymers were analyzed, and their relationships were established for the first time. The mechanism of central metal size tuning the sequence distribution was discussed based on DFT calculations.