The thermal degradation of poly(-(d)-β-hydroxybutyric acid): Part 1—Identification and quantitative analysis of products

✍ Scribed by N. Grassie; E.J. Murray; P.A. Holmes

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 583 KB
• Volume: 6
• Category: Article
• ISSN: 0141-3910
• DOI: 10.1016/0141-3910(84)90016-8

✦ Synopsis

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.