Télomérisation en milieu aqueux, 2. Étude cinétique de la télomérisation de l'acide acrylique avec l'acide thioglycolique

✍ Scribed by Bernard Boutevin; Gérard Rigal; Mohammed El Asri; Tahar Lakhlifi

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 637 KB
• Volume: 197
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1996.021970718

✦ Synopsis

Abstract

The telomerization of acrylic acid with thioglycolic acid initiated with hydrogen peroxide in aqueous medium is presented. In order to better control this reaction, the decomposition of H~2~O~2~ was first investigated by means of differential scanning calorimetry (DSC), leading to a very high value of the dissociation rate constant (k~d~), and then studied by volumetry in the presence of a mercaptan. This second method gave a higher value of k~d~ (by about 6 orders of magnitude at 50°C). From the latter value, the ratio fk~P~^2^/k~Te~ and the transfer constant of thiogiycolic acid, C~t~, were determinated and compared with those reported in the literature. The kinetical parameters, obtained from theoretical and experimental values of DP~n~ and the conversion of the monomer are in good agreement and allow to prepare telomers of acrylic acid with controlled chain length.