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zeige Details Yamazaki, Noboru., Iguchi, Tadao., ... Studies on reactions of the N-phosphonium salts of pyridines. XIII. Direct polycondensation reaction of carbon dioxide or disulfide with diamines under mild conditions
in: Journal of Polymer Science: Polymer Chemistry Edition, in: Journal of Polymer Science: Polymer Chemistry Edition . - New York : John Wiley & Sons, Inc., ISSN 0360-6376 Vol. 13 (4. 1975), p. 785-795
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1975
Polyureas of high molecular weight were obtained by the direct polycondensation reaction of carbon dioxide with diamines at 40°C for several hours under a pressure of carbon dioxide (below 30 atm) by use of diphenyl phosphite in pyridine. Optimal temperature and pressure were 40°C and 20 atm of carbon dioxide. The polycondensation reaction was also affected by solvents and type and amounts of tertiary amines. Pyridine was most effective as tertiary amine and solvent as well. Of the phosphorous compounds used, triaryl phosphites and diphenyl phosphite were most effective, but trialkyl phosphites failed to give polymer. The reaction was assumed to proceed via a carbamyl N-phosphonium salt of pyridine formed by dephenoxylation of phosphites. Similarly, polythioureas were prepared by heating a mixture of carbon disulfide, diamines, and diphenyl phosphite in pyridine at 40°C for 6 hr under nitrogen.
Copyright: Copyright © 1975 John Wiley & Sons, Inc.
beteiligte Personen: Yamazaki, Noboru. , Iguchi, Tadao. , Higashi, Fukuji.
Format: Elektronisch
Sprache: English
Erschienen: 1975.
Serie: Wiley InterScience Backfile Collection 1832-2000 [Dig. Serial]
Schlagwörter:
URL: http://dx.doi.org/10.1002/pol.1975.170130402

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