caa a22 4500 378903268 CHVBK 20180305123523.0 cr unu---uuuuu 161128e20041201xx s 000 0 eng 10.1515/epoly.2004.4.1.81 doi (NATIONALLICENCE)gruyter-10.1515/epoly.2004.4.1.81 Fractionation and ammonolytic degradation of poly(hexamethylene carbonate) in (supercritical) ammonia [Elektronische Daten] [Werner Mormann, David Spitzer] Solubility, fractionation by extraction as a function of temperature, and ammonolysis of α-hydro-ω-hydroxy-poly(oxycarbonyloxyhexane-1,6-diyl) in liquid and supercritical ammonia have been studied. Up to 120°C, the solubility of poly- (hexamethylene carbonate) increases with temperature without significant ammonolytic cleavage. Above the critical temperature of ammonia, solubility and molar mass of the solute decrease as ammonolysis becomes more and more important. The molar mass of the extracted and residual polymer decreases with temperature under supercritical conditions. Adjusting residence time and reactivity through temperature and flow rate enables controlled ammonolysis to constant molar mass. Kinetics of dihexyl carbonate and hexyl carbamate shows that ammonolysis of the carbamate is much faster than of dihexyl carbonate. © 2013 by Walter de Gruyter GmbH & Co. Mormann Werner Universität Siegen, FB 8, Laboratorium für Makromolekulare Chemie, Adolf Reichwein-Str. 2, 57076 Siegen; Fax +49(0)271 7402226 aut Spitzer David Entwicklungsgesellschaft für Akustik mbH, Brauckstr. 51, 58454 Witten; Fax +49(0)2302 668 238 aut e-Polymers De Gruyter 4/1(2004-12-01), 81-92 2197-4586 4:1<81 2004 4 epoly https://doi.org/10.1515/epoly.2004.4.1.81 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/epoly.2004.4.1.81 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mormann Werner Universität Siegen, FB 8, Laboratorium für Makromolekulare Chemie, Adolf Reichwein-Str. 2, 57076 Siegen; Fax +49(0)271 7402226 aut NATIONALLICENCE 700 1- Spitzer David Entwicklungsgesellschaft für Akustik mbH, Brauckstr. 51, 58454 Witten; Fax +49(0)2302 668 238 aut NATIONALLICENCE 773 0- e-Polymers De Gruyter 4/1(2004-12-01), 81-92 2197-4586 4:1<81 2004 4 epoly CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter