Abstract
This paper describes the alternating copolymerization of vinylphosphonic acid monoethyl ester 1 with five-, six-, and seven-membered cyclic phosphonites (2a, 2b, and 2c). The copolymerization took place without any catalyst. Reaction of the 1:1 monomer feed ratio gave alternating copolymers having the phosphonite-phosphonate unit. During the copolymerization the proton-transfer in monomer 1 took place and the oxidation-reduction process is involved. The copolymerization is reasonably explained by a mechanism which involves zwitterion intermediates. The apparent monomer reactivity ratios determined in benzonitrile at 150°C are r1=0.00 and r2b=0.16. A kinetic study of the Michael-type addition in the initiation stage showed that 2b was more reactive than 2a or 2c.
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Kadokawa, Ji., Yen, IF., Shoda, Si. et al. Alternating Copolymerization of Vinylphosphonic Acid Monoethyl Ester with Cyclic Phosphonites Involving Proton-Transfer. Polym J 24, 1205–1214 (1992). https://doi.org/10.1295/polymj.24.1205
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DOI: https://doi.org/10.1295/polymj.24.1205