Abstract
trans-1-Phenyl-1,3-butadiene (1-PB) was polymerized easily by Friedel—Crafts catalysts. The polymers obtained were soluble white powders. The polymer structure was determined spectroscopically; the results suggested that 1-PB was polymerized predominantly in the fashion of a 3, 4-type cationic polymerization and that about a half of the 3, 4-double-bonds were cyclized intramolecularly during the polymerization. In the cases of SnCl4, BF3OEt2, and Ph3CSnCl5 the kinetic study was also performed. It was found in all cases that the initial rate of polymerization was proportional to the initial concentrations of both monomer and catalyst. From the molecular weight of the polymers obtained the monomer chain-transfer was shown to be mainly a terminating reaction. These kinetic results described the total scheme of cationic polymerization of this diene monomer, which was characterized by a rapid initiation. In the course of cationic polymerization of 1-PB, a colored species developed; it was followed by visible spectrum measurements. The absorption peak at 440 nm was assigned to a propagating species. The other absorption bands at 400, 493, and 570 nm were assigned to cations formed on the polymer by chain transfer.
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Asami, R., Hasegawa, Ki. & Onoe, T. Cationic Polymerization of Phenylbutadienes. I. Cationic Polymerization of trans-1-Phenyl-1,3-butadieiie. Polym J 8, 43–52 (1976). https://doi.org/10.1295/polymj.8.43
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DOI: https://doi.org/10.1295/polymj.8.43