| Autor: |
Binns, F., Harffey, P., Roberts, S. M., Taylor, A. |
| Zdroj: |
Journal of Polymer Science Part A: Polymer Chemistry; 15 September 1998, Vol. 36 Issue: 12 p2069-2080, 12p |
| Abstrakt: |
Preliminary enzymatic polymerization studies in the simple stoichiometric adipic acid/butane-1,4-diol system using lipase B from Candida antarctica, immobilized as Novozym 435®, suggest that in solvent-free conditions a step-growth mechanism operates involving the sequential addition of an AB synthon by esterification mode only. Conversely, in toluene as solvent there is a change to the more facile transesterification mode in line with the conventional polyesterification procedure, pointing to a change in specificity of the lipase. Evidence is drawn from qualitative studies using a series of synthetic intermediates, enabling authentication of product mixtures together with an indication of the comparative reactivity of species along the proposed reaction pathway. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 20692080, 1998 |
| Databáze: |
Supplemental Index |
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