| Autor: |
Garcia-Martin, M. G., Perez, R. R., Hernandez, E. B., Espartero, J. L., Munoz-Guerra, S., Galbis, J. A. |
| Zdroj: |
Macromolecules; October 2005, Vol. 38 Issue: 21 p8664-8670, 7p |
| Abstrakt: |
Linear homo- and co-polycarbonates have been prepared from the sugar-based diols 2,3,4-tri-O-methyl-l-arabinitol and 2,3,4-tri-O-methylxylitol. Statistical co-polycarbonates were obtained from molar feed ratios of sugar:bisphenol A of 1:1 and 2:1. The polycarbonates were stable up to ~280 °C with maximum decomposition rate above 345 °C. The arabinitol-based homopolymer was found to be semicrystalline whereas the xylitol-based one was amorphous. All the copolymers were amorphous with Tg ranging between 60 and 80 °C. Both homo- and co-polycarbonates showed high resistance to chemical hydrolysis; however, they were enzymatically degraded in different degree. The xylitol-based polycarbonates were the more easily degraded by lipase B from Candida antarctica in acetonitrile at 70 °C&sbd;this enzyme showing a high selectivity toward the configuration of the sugar-based moiety. |
| Databáze: |
Supplemental Index |
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