New self-crosslinkable polyethers

✍ Scribed by Eldin, Sameer H.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1990
• Tongue: English
• Weight: 551 KB
• Volume: 23
• Category: Article
• ISSN: 0007-1641
• DOI: 10.1002/pi.4980230115

✦ Synopsis

Abstract

New alkylene‐polyethers, OPh(CH~2~)__n__PhOPhXPh with X = SO~2~, CO are described that undergo an unexpected crosslinking reaction at temperatures ≧ 250°C. ^H^NMR indicates the participitation of methylene groups in the vicinity of the aromatic ring and of the phenyl rings of the diarylsulphone moiety in this crosslinking reaction.

The crosslink density can be regulated via copolyaddition with bisphenol A. Polyethers of the general structure OPhRPhOPhXPh with R = (CH~2~)~6~ + C(CH~3~)~2~, X = SO~2~, CO are easily processable, impact and solvent resistant. ESR measurements correlate with the ^H^NMR findings and identify the crosslinking as a radical reaction.

A crosslink mechanism is proposed and substantiated by the synthesis of specific model polymers.