Dithiadiazolium salts as initiators for the cationic ring-opening polymerization of tetrahydrofuran

Autor:	Arthur J. Banister, Anthony W. Luke
Rok vydání:	1992
Předmět:	Polymers and Plastics Bulk polymerization Aryl Organic Chemistry Dispersity Cationic polymerization Ring-opening polymerization Gel permeation chromatography chemistry.chemical_compound Polymerization chemistry Polymer chemistry Materials Chemistry Tetrahydrofuran
Zdroj:	Journal of Polymer Science Part A: Polymer Chemistry. 30:2653-2656
ISSN:	1099-0518 0887-624X
DOI:	10.1002/pola.1992.080301219
Popis:	Mono-, bis- and tris-(1,3,2,4-dithiadiazolium) salts [R-(CNSNS+)n]n+[AsF-6]n (R = aryl, n = 1, 2, 3) were found to initiate the cationic ring-opening polymerization of tetrahydrofuran (THF) at room temperature to give clear gels from which the pure polymer was precipitated. 1,3,2,4-Dithiadiazolium cations associated with the hard [AsF6]- anion thus constitute a new class of cationic polymerization initiators. The poly(THF) formed by initiation with 1,3,2,4-dithiadiazolium cation was characterized by gel permeation chromatography, infrared spectrophotometry, and 13C-NMR spectroscopy. Number-average molecular weights of 198 700 g mol-1 (polydispersity 1.96) and 190 000 g mol-1 (polydispersity 1.61) were obtained using [PhCNSNS] [AsF6] and [C6H3-1,3,5-(CNSNS)3][AsF6]3, respectively, as initiators. The use of multifunctional dithiadiazolium salts as initiators suggests that they may be useful in the preparation of starburst and dendritic polymers. © 1992 John Wiley & Sons, Inc.
Databáze:	OpenAIRE
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