Solid-state initiation of polymerization of N-vinylcarbazole by gases

Autor: R. A. Meyers, E. M. Christman
Rok vydání: 1968
Předmět:
Zdroj: Journal of Polymer Science Part A-1: Polymer Chemistry. 6:945-950
ISSN: 1542-9350
0449-296X
DOI: 10.1002/pol.1968.150060423
Popis: Chlorine gas has been shown by previous investigators to initiate the polymerization of solid N-vinylcarbazole at room temperature, giving a maximum yield of 66% polymer after 18 hr. This initiation of polymerization of N-vinylcarbazole without the application of heat, by a gas, is the only solid-state initiation other than those that are radiation-induced known to us. This study was undertaken in order to determine both the scope and the mechanism of the room-temperature solid-state initiation of vinyl polymerization of N-vinylcarbazole by gases. The gases (HCl, Cl2, and N2O4) were absorbed by solid N-vinylcarbazole, giving very rapid exothermic polymerization: HCl, 37% polymer yield, Mn 2500; Cl2, 50% polymer yield, Mn 4703; N2O4, 91% polymer yield, Mn 7073. The gases NOCl, BF3, and HBr were not absorbed by N-vinylcarbazole and did not initiate polymerization. The N2O4-initiated polymerization, which gave a high yield of polymer, was complete within 5 min. after introduction of gas. This polymerization method and the resulting polymer compared favorably with conventional peroxide-initiated melt polymerization and the polymer obtained thereform. The mechanism of gas-initiated polymerization, which was studied with introduction of inhibitors, appears to be classically cationic in nature.
Databáze: OpenAIRE
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