Kinetics of ring-scission copolymerization

Autor:	W. A. Ames, O. C. Dermer
Rok vydání:	1964
Předmět:	Materials science Mayo–Lewis equation macromolecular substances General Medicine Aziridine Catalysis chemistry.chemical_compound Monomer chemistry Polymer chemistry Copolymer Epichlorohydrin Propylene oxide Triethylamine
Zdroj:	Journal of Polymer Science Part A: General Papers. 2:4151-4157
ISSN:	1542-6246 0449-2951
DOI:	10.1002/pol.1964.100020931
Popis:	β-Propiolactone and propylene sulfide with triethylamine catalyst produced only polypropiolactone, but the lactone and DL-valine N-carboxy anhydride gave a copolymer of low molecular weight. Neither the classical copolymer equation nor the relationship pointed out by O'Driscoll applies to this copolymerization, but the valine N-carboxy anhydride was obviously the much more reactive. The rate of acid-catalyzed copolymerization of N-(2-hydroxyethyl)aziridine and N-(2-hydroxy-n-propyl)aziridine was essentially equal to the sum of the rates of the homopolymerizations of the two monomers, as was found by Shalitin and Katchalski for several pairs of N-carboxy-α-amino acid anhydrides. A mixture of propylene oxide and epichlorohydrin did not exhibit this ideal behavior and was polymerized very little more rapidly than propylene oxide alone.
Databáze:	OpenAIRE
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