Hyperbranched Poly(arylene ether amide) via Nucleophilic Aromatic Substitution Reaction

✍ Scribed by Insik In; Sang Youl Kim

• Book ID: 102486994
• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 153 KB
• Volume: 206
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200500167

✦ Synopsis

Abstract

Summary: New hyperbranched poly(arylene ether amides) with fluorine or hydroxy end groups were synthesized from AB~2~ or A~2~B type monomers via a nucleophilic aromatic substitution (S~N~Ar) reaction. Monomer syntheses were facilitated by chemo‐selective amidation reactions, and even a direct synthesis of hyperbranched polymer was possible without isolation of the monomer. The resulting hyperbranched poly(arylene ether amides) showed highly branched characteristics (DB = 0.43–0.53), high glass transition temperatures (T~g~ > 220 °C), and high thermal stability (T~d10~ > 420 °C). All hyperbranched polymers were readily soluble in aprotic polar solvents such as DMF, DMSO, and NMP regardless of the end groups. Such a similar solubility pattern may result from the high amide contents and longer branching distances between adjacent branching points in these hyperbranched polymer backbones.

Polymerization of AB~2~ and A~2~B‐type monomers.

imagePolymerization of AB~2~ and A~2~B‐type monomers.