Novel Branched Polyphenylenes based on A2/B3 and AB2/AB Monomers via Diels-Alder Cycloaddition

✍ Scribed by Katrin Stumpe; Hartmut Komber; Brigitte I. Voit

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 226 KB
• Volume: 207
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200600422

✦ Synopsis

Abstract

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.

magnified imageSchematic structure of hyperbranched polyphenylenes from A~2~ and B~3~ monomers.