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Nitrone Mediated Coupling of Hyperbranched Polymer Radicals
Author(s) -
Du Min,
Deng Chang,
Wu Xiaoran,
Liu Huarong,
Liu Hewen
Publication year - 2017
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201700069
Subject(s) - nitrone , polymer , radical , polymer chemistry , step growth polymerization , coupling reaction , polymerization , materials science , chemistry , organic chemistry , catalysis , composite material , cycloaddition
The coupling of hyperbranched polychloromethylstyrene (PCMS) radicals with nitrone is studied in this work. Hyperbranched PCMS radicals are generated by a redox reaction of terminal chloride groups with Cu(I)Cl. The molecular weight data show that nitrone mediated radical coupling of PCMS is a kind of step polymerization. The molecular weights of the coupled products in a fixed coupling reaction time increase as the contents of nitrone increase in a wide concentration range, whereas are less affected by the content of CuCl. FTIR and NMR spectra prove the formation of alkoxyamine in the mid‐chains arising from nitrone‐mediated coupling. The nitrone‐coupled hyperbranched polymers show the birefringent property if being watched in a crossed polarizing microscope. The intrinsic viscosity data imply that the nitrone‐coupled hyperbranched polymers in solution behave like rod‐like structures. These nitrone‐coupled hyperbranched polymers are thermodegradable. This kind of cylindrical polymers with highly branched substructures may find important application as anisotropic monomolecular gels or molecular reinforcement, catalyst hosts, etc.