| 초록 |
The substitution of petrochemical commodities into Bio-derived polymer has been attracting great attention to deal with depletion of fossil-fuel and environmental pollution. In this turn, the Levulinic acid (LA), which could be easily produced from glucose, was researched for platform material in bio-refinery. However, two different functional group in LA (carboxylic acid and ketone) cannot be directly polymerized, it requires two kinds of competitive chemical reaction (ketalization and esterification) with tri-ol. To secure high molecular weight, and well defined polymer from LA, the reactivity balance between ketalization and esterification was critical, but it cannot be achieved by conventional catalysts. In this study, we strategically design site-isolated dual-acidic catalyst with Brønsted acid and Lewis acid. The dual functional catalyst present high selectivity in ketalization, and well-defined linear polymer with high molecular weight was obtained. |
