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Novel Branched Polyphenylenes based on A 2 /B 3 and AB 2 /AB Monomers via Diels‐Alder Cycloaddition
Author(s) -
Stumpe Katrin,
Komber Hartmut,
Voit Brigitte I.
Publication year - 2006
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.200600422
Subject(s) - monomer , polymer chemistry , polymer , materials science , thermal stability , chemistry , organic chemistry
Summary: Novel hyperbranched polyphenylenes based on both an A 2 + B 3 and an AB 2 + AB approach were synthesised and characterised. Different monomers were prepared and polymerised using a Diels‐Alder reaction with subsequent decarbonylation. The polymer backbones consist of hexaphenylbenzene units which are linked in different positions and functionalised by cyclopentadienone (A) and/or alkyne groups (B) depending on the monomer ratio. The structure and properties of the resulting polymers were compared to those of hyperbranched polyphenylenes based solely on an AB 2 monomer. All branched products showed high thermal stability and good solubility in common organic solvents such as chloroform or toluene. However, due to steric hindrance, the polyphenylenes produced using the A 2 + B 3 approach exhibited a high percentage of linear units within the polymer structure.Schematic structure of hyperbranched polyphenylenes from A 2 and B 3 monomers.