ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Anionic polymerization of vinylmesitylene was investigated in THF (counterion Na+) at temperatures ranging from +25° to -70°C. The homopropagation is slow (kp ∼ 11./mole-sec. at 25°C.), indicating the basically low reactivity of the monomer. Studies of conductivity and the retardation of the polymerization by the addition of Na+BPh4- demonstrate that free ions and ion pairs participate in the process. At 25°C. the kp of the free ion appears to be about 1000 times greater than that of ion pair. The outstanding feature of the polymerization is the proton transfer from the monomer to living end, producing an inert ion (or its isomer) which does not propagate. This reaction leads to retardation of the polymerization. Its contribution decreases on lowering the temperature, and the effect of Na+BPh4- indicates that the free ion, and not the ion-pair, acts as a base in the proton transfer.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1965.100030905
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