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| Titel: |
Intramolecular Cyclization in Tetrafunctional Monomer Free Radical Polymerization |
| Auteur: |
Romantsova, I. I. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 19 (1993) nr. 1-2 pagina's 51-61 |
| Jaar: |
1993-01-01 |
| Inhoud: |
Tetrafunctional monomer free radical polymerization was simulated by Monte-Carlo algorithm. Two mechanisms of cyclization were taken into account: interaction of two free radicals (chain termination) and that of a free radical with the double bond (“intramolecular propagation” of the chain). The considerable cyclization of polymers at the very beginning of the reaction was revealed. Intramolecular chain propagation provides the main factor contributed. The number of cycles by the termination mechanism makes up no more than 20% of total amount. The cycle size distribution dependencies on polymerization rate constants for two cyclization mechanisms were shown to be essentially different. The pregel stage of free radical polymerization of diallyl isophthalate and diallyl sebacate was investigated experimentally. The number of cycles was evaluated from the material balance of the double bonds. The significant cyclization of polymers was found out: a single cycle requires on average 6-8 monomer units. The results prove the intramolecular cyclization should be taken into account in interpreting experimental data and in creating a theory of branched free radical polymerization. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 12 gevonden artikelen
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