Synthesis, Microstructure, and Acidity of Poly(vinylphosphonic acid)

✍ Scribed by Bahar Bingöl; Wolfgang H. Meyer; Manfred Wagner; Gerhard Wegner

• Book ID: 102493449
• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 153 KB
• Volume: 27
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200600513

✦ Synopsis

Abstract

Summary: Vinylphosphonic acid is polymerized at 80 °C by free radical polymerization to give a high‐molecular‐weight polymer ($\overline M _{\rm w}$ of 6.2 × 10^4^) as determined by static light scattering. High‐resolution NMR spectroscopy is used to gain microstructure information. Information based on tetrad probabilities is utilized to deduce an almost atactic configuration. In addition, ^13^C NMR spectroscopy gives evidence for the presence of head‐to‐head and tail‐to‐tail links. Refined analysis of the ^1^H NMR spectra allows for the quantitative determination of the fraction of these links (23.5% of all links). Experimental evidence suggests that the polymerization proceeds via cyclopolymerization of the vinylphosphonic acid anhydride as an intermediate. Titration curves indicate that high‐molecular‐weight poly(vinylphosphonic acid) PVPA behaves as a monoprotic acid.

Radical polymerization of vinylphosphonic acid proceeds by cyclopolymerization of its anhydride.

magnified imageRadical polymerization of vinylphosphonic acid proceeds by cyclopolymerization of its anhydride.