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Titolo:
MALDI-TOF-MS analysis of living cationic polymerization of vinyl ethers. III. Polymerization with SnCl4 and TiCl4 in the absence of additives
Autore:
Katayama, H; Kamigaito, M; Sawamoto, M;
Indirizzi:
Kyoto Univ, Grad Sch Engn, Dept Polymer Chem, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 , Dept Polymer Chem, Kyoto 6068501, Japan
Titolo Testata:
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
fascicolo: 8, volume: 39, anno: 2001,
pagine: 1258 - 1267
SICI:
0887-624X(20010415)39:8<1258:MAOLCP>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
FLIGHT MASS-SPECTROMETRY; INITIATING SYSTEMS;
Keywords:
MALDI-TOF-MS; living polymerization; cationic polymerization; vinyl ether;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Sawamoto, M Kyoto Univ, Grad Sch Engn, Dept Polymer Chem, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 er Chem, Kyoto 6068501, Japan
Citazione:
H. Katayama et al., "MALDI-TOF-MS analysis of living cationic polymerization of vinyl ethers. III. Polymerization with SnCl4 and TiCl4 in the absence of additives", J POL SC PC, 39(8), 2001, pp. 1258-1267

Abstract

Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analysis revealed that the precision control (or the living nature) of the cationic polymerization of vinyl ethers with SnCl4 or TiCl4 critically depends on the Lewis acid concentration and temperature. Specifically, at anextremely low Lewis acid concentration, for example, the polymerization with the HCl-vinyl ether adduct (an initiator) is living at -78 degreesC in CH2Cl2 solvent, whereas side reactions occurred at a higher concentration ofSnCl4 or at a higher temperature, -15 degreesC. This was more pronounced with SnCl4 than with TiCl4, which was due to a stronger Lewis acidity of SnCl4 as suggested by NMR analysis of the model reactions. (C) 2001 John Wiley& Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 12:08:33