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Kinetics of ring-opening radical polymerization of vinyloxiranes

✍ Scribed by Osamu Ito; Tatsushi Ishizuka; Masashi Iino; Minoru Matsuda; Takeshi Endo; Tsutomu Yokozawa

Publisher: John Wiley and Sons
Year: 1991
Tongue: English
Weight: 375 KB
Volume: 23
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550231002

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✦ Synopsis

Ring-opening radical polymerization has been followed by the flash photolysis method. As a n initiator radical, the arylthiyl radical (ArS') was used; the addition reaction rate constants of ArS' to vinyl monomer containing epoxy-ring such as vinyloxiranes (CH2 = C H C m H 2 ) have been determined at first. The rate constant of ring opening reaction of the adduct radical (ArSCH2C'HCmHZ) changing to ArSCH2CH =CRQCH2' were determined in the form of the relative values, which were converted to the absolute values. The ring-opening reaction rate constants were ca. lo6 s-', which indicates that the ring-opening rates are faster than usual radical propagation rates. The rate constants for vinyl monomer with &member ring (1,4-epoxy-1,4-dihydronaphthalene) were similarly evaluated.

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