Abstract
In aqueous solutions, 2,3-butanedione (biacetyl: BA) served as a sensitizer for the photopolymerization of acrylamide (AA). The presence of inorganic salts such as KSCN, KSeCN, and NaN3 increased not only the rate of polymerization but also the molecular weight of the polymer. On the other hand, Na2SeO3 increased the rate of polymerization markedly with apparently normal kinetic behavior. In the absence of any salt, the triplet excited state of BA was shown to act as a degradative chain transfer agent as well as a photo-sensitizer. The mechanism of this characteristic photosensitized polymerization is discussed.
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Takemura, F., Iwai, K., Ikesu, M. et al. Effects of Inorganic Anions on the Photopolymerization of Acrylamide Sensitized by 2,3-Butanedione in Aqueous Solutions. Polym J 20, 565–575 (1988). https://doi.org/10.1295/polymj.20.565
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DOI: https://doi.org/10.1295/polymj.20.565