Acylation of (partially) silylated poly(vinyl alcohol)s with acyl chlorides. Vinyl chloride/vinyl ester copolymers by polymer analogous reaction
✍ Scribed by Werner Mormann; Thomas Wagner
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 433 KB
- Volume
- 197
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
Acylation of (partially) silylated poly(vinyl alcohol) with acyl chlorides and anhydrides was investigated under different conditions. In the presence of an acid acceptor (triethylamine) at temperatures below 50°C selective acylation of hydroxy groups was observed in agreement with literature data. At elevated temperature (160°C) without the use of an acid acceptor hydroxy and trimethylsiloxy groups react in an unselective manner. In addition, significant amounts of chlorine were found in the resulting polymers under these conditions, though no double bonds were detected. A polymer analogous reaction without incorporated chlorine was achieved with benzoic anhydride as acylating agent. Random distribution of chlorine and benzoyloxy groups most likely is obtained.