Polyethylene-g-Polystyrene Copolymers by Combination of ROMP, Mn-2(CO)(10)-Assisted TEMPO Substitution and NMRP


Çiftçi M. , Arslan M., Buchmeiser M., Yagci Y.

ACS MACRO LETTERS, vol.5, no.8, pp.946-949, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 5 Issue: 8
  • Publication Date: 2016
  • Doi Number: 10.1021/acsmacrolett.6b00460
  • Title of Journal : ACS MACRO LETTERS
  • Page Numbers: pp.946-949

Abstract

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 (Mn-2(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 H-1 NMR, FT-IR, GPC, and DSC analyses.