Diblock copolymer worms stabilized pH-responsive Pickering emulsions: An efficient and recyclable platform for Claisen-Schmidt condensation reaction

다국어 초록 (Multilingual Abstract)

Pickering emulsions were promising platforms for the heterogeneous reactions due to both their largeinterfacial areas and high stability, whereas both the product separation and the emulsifier recoveryvia simple and efficient strategies for remain a concern. In this study, we constructed an efficient andrecyclable platform for interfacial catalytic reaction adopting pH-responsive n-decane-in-waterPickering emulsions. Pickering emulsions were prepared employing core cross-linked PEO45-PGMA74(CCE45G74) diblock copolymer worms as Pickering emulsifiers. CCE45G74 diblock copolymer worms wereprepared via the combination of photo-initiated polymerization induced self-assembly strategy and thecore covalent cross-linking with ethylenediamine. The prepared n-decane-in-water Pickering emulsionsshowed a high stability during the storage at the room temperature, whereas a rapid demulsification tookplace at a lower pH, such as 2.5. Alkali-catalyzed Claisen-Schmidt condensation reactions between benzaldehydeand acetone were conducted in n-decane-in-water Pickering emulsions at 30 C. The yield ofdibenzylidene acetone could reach 99% after 12 h of reaction. The reaction efficiency was far higher thanthat at the plain n-decane-water (30%). This catalytic platform could be repeatedly used for three cycles