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Can I read Fractionation and Ammonolytic Degradation of Poly(hexamethylene Carbonate) in (Supercritical) Ammonia on EtoBox?
Fractionation and Ammonolytic Degradation of Poly(hexamethylene Carbonate) in (Supercritical) Ammonia by Werner Mormann; David Spitzer is a Materials Science article available to read on EtoBox.
What is Fractionation and Ammonolytic Degradation of Poly(hexamethylene Carbonate) in (Supercritical) Ammonia about?
## Abstract 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.
Who reads Fractionation and Ammonolytic Degradation of Poly(hexamethylene Carbonate) in (Supercritical) Ammonia?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Werner Mormann; David Spitzer
- Publisher
- Walter de Gruyter GmbH
- Published
- 2004
- Language
- EN
- Field
- Materials Science (Physical Sciences)