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The Thermal Degradation of Poly(-(D)-/~- Hydroxybutyric Acid): Part 1 Identification and Quantitative Analysis of Products

Tipo de material: TextoTextoSeries ; Polymer Degradation and Stability, 6, p.47-61, 1984Trabajos contenidos:
  • Grassie, N
  • Murray, E.J
  • Holmes, P.A
Recursos en línea: Resumen: Poly(-(D)-fl-hydroxybutyric acid)thermally degrades quantitatively under vacuum to volatile products at temperatures up to 338°C. Weight percentages oJ products are." dimer (41"2), crotonic acid (35"3), trimer (12.5), tetramer (2"9)and iso-crotonic acid (0"9). When the temperature is programmed to 500 °C either under vacuum or nitrogen at atmospheric pressure, small amounts of carbon dioxide, propene, ketene, acetaldehyde and fl-butyrolactone (only under vacuum)are also Jormed, but it is shown that these are secondary productsJormed byJurther decomposition of the primary products.
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Poly(-(D)-fl-hydroxybutyric acid)thermally degrades quantitatively under vacuum to volatile products at temperatures up to 338°C. Weight percentages oJ products are." dimer (41"2), crotonic acid (35"3), trimer (12.5), tetramer (2"9)and iso-crotonic acid (0"9). When the temperature is programmed to 500 °C either under vacuum or nitrogen at atmospheric pressure, small amounts of carbon dioxide, propene, ketene, acetaldehyde and fl-butyrolactone (only under vacuum)are also Jormed, but it is shown that these are secondary productsJormed byJurther decomposition of the primary products.

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