Copolymerization of styrene with isobutyl vinyl ether by radiation
In order to elucidate the reason for the considerable difference in the activation energies for the propagation of styrene and isobutyl vinyl ether (IBVE), radioinduced copolymerization of styrene with IBVE was carried out in bulk at 0 and 40 deg C. The obtained copolymerization ratios are (Mi = styrene) at 0 deg C r/sub 1/ = 0.46 plus or minus 0.05, r/sub 2/=9 plus or minus 1 and at40 deg C r/sub 1/= 0.20 plus or minus 0.06, r/sub 2/= 11 plus or minus 3. From th e temperature dependences of r/sub 1/ and r/sub 2/, mutual polymerization rate constants, k/sub 12/ and K/sub 21/, and their activation energies, E/sub p/, w ere evaluated assuming both K/sub p/ and E/sub p/ values obtained in bulk polymerizations of styrene and IBVE are constant also in the copolymerization systems studied. It is found that in the reactivity of cation, styrene is greater than IBVE, however, the relation is reversed in relative reactivity of monomer. From the comparison with E/sub p/ values in other free cationic polymerization systems, Esub p/ value for IBVE cation is considered to be in some respects extraordinary high, as well as its frequency factor. This is presumably explained in terms of the solvation of IBVE to cation and possibly, resonance stabilization of IBVE cation end. (auth)
- Research Organization:
- Japan Atomic Energy Research Inst., Osaka
- NSA Number:
- NSA-29-009933
- OSTI ID:
- 4409273
- Journal Information:
- Polym. J., v. 4, no. 5, pp. 495-501, Journal Name: Polym. J., v. 4, no. 5, pp. 495-501; ISSN POLJB
- Country of Publication:
- Japan
- Language:
- English
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