writer：Yuanhao Zhong, Yi Wu, and Dongmei Cui
keywords：Copolymerization,Monomers,Copolymers,Selenium,Polymers
source：期刊
specific source：Macromolecules 2021, 54, 1754-1759
Issue time：2021年
Synthesis of selenium-containing syndiotactic polystyrene through coordination polymerization is di?cult to achieve since selenium atoms usually poison the applied catalysts. Herein, we report the coordination polymerization of para-methylselenostyrene (pMSS) and its copolymerization with styrene (St) using pyridyl-methylene-?uorenyl-supported complexes [(Py?CH2?Flu)Ln-(CH2SiMe3)2(THF)n (Ln = Y (1), n = 1; Ln = Sc (2), n = 0)]. Complex 1 was completely inert, while complex 2 was highly active and exhibited >99% syndioselectivity to yield poly(pMSS) as the rare crystalline polymer-containing selenium atoms in side chains. In addition, the copolymerization of polar pMSS with nonpolar St under various pMSS-to-St ratios proceeded smoothly. The excellent syndiotacticity was maintained in the copolymerization, and the obtained copolymers have random sequence distributions con?rmed by 13 C NMR spectrum analysis and kinetics study. The optical performances of the copolymers with di?erent incorporations of selenium were studied.
