Abstract
AbstractSummary: Novel hyperbranched polyphenylenes based on both an A2 + B3 and an AB2 + 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 AB2 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 A2 + B3 approach exhibited a high percentage of linear units within the polymer structure.Schematic structure of hyperbranched polyphenylenes from A2 and B3 monomers.magnified imageSchematic structure of hyperbranched polyphenylenes from A2 and B3 monomers.
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