Polyethylene-g-Polystyrene Copolymers by Combination of ROMP, Mn2(CO)10-Assisted TEMPO Substitution and NMRP

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• 作者：Mustafa Ciftci ; Mustafa Arslan ; Michael Buchmeiser ; Yusuf Yagci
• 刊名：ACS Macro Letters
• 出版年：2016
• 出版时间：August 16, 2016
• 年：2016
• 卷：5
• 期：8
• 页码：946-949
• 全文大小：333K
• 年卷期：0
• ISSN：2161-1653

文摘

The synthesis of polyethylene-graft-polystyrene copolymers by a multistep “grafting from” approach is described. In the first step, a bromo-functional polyethylene (PE-Br) was synthesized via ring-opening metathesis polymerization (ROMP) of cis-cyclooctene (COE) and quantitative hydrobromination. Subsequent irradiation of PE-Br under visible light in the presence of dimanganese decacarbonyl (Mn₂(CO)₁₀) and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) resulted in the formation of TEMPO-substituted polyethylene (PE-TEMPO). Polystyrene (PS) chains were then grown via nitroxide mediated radical polymerization (NMRP) from the PE-TEMPO precursor to give desired PE-g-PS copolymers in a controlled manner. The intermediates at each step and final graft copolymers were characterized by ¹H NMR, FT-IR, GPC, and DSC analyses.