Design & Synthesis Of Functional Molecularly Imprinted Polymer Catalysts And Their Self-Modulated Catalysis

Catalysis is the cornerstone of modern chemical industry.One of the most important advances in catalysisis molecular imprinting and its highly selective catalysis.However,the practical application of catalysis usually involves multi-step reactions and selective-switchable catalytic processes,and the existing imprinted polymers and catalysts cannot meet the needs of the development of the catalysis.In order to meet this challenge,we had developed a molecularly imprinted catalyst which could be used as a continuous catalyst and a molecularly imprinted catalyst with selectivity-switchable.In order to realize the continuous catalytic reaction,we combined the metal nanoparticles and functional molecularly imprinted polymersto prepare the molecularly imprinted catalysts for continuous catalytic hydrolysis and reduction reactions firstly.In this study,we used 2-acrylamido-2-methylpropanesulfonic acid as functional monomer,with bis(p-nitrophenyl)carbonate and p-nitrophenol as the coupled templates and Au nanoparticles as metal active center.And then we prepared the molecularly imprinted catalyst.The acid center allowed the catalytic hydrolysis of bis(p-nitrophenyl)carbonate,and the metal center allowed the subsequent reduction reaction to be carried out.At the same time,the catalyst was not only a continuous catalytic function,but also had high selectivity because of the molecularly imprinted polymer carrier.In addition,in order to achieve controllable selective catalysis,this study used 9-decenoic acid as functional monomer,using p-hydroxybenzaldehyde as template molecule,using Ag nanoparticles as active metal center,and then prepared molecularly imprinted catalyst for selectivity-switchable.The chain structure of 9-decenoic acidbuilt a mobile molecular chain in the prepared molecularly imprinted catalyst,thus affecting the substrate channel.At low temperature,the molecular chain in the prepared polymer was frozen.Thus,the prepared molecularly imprinted polymers had the ability to identify specific substrates p-hydroxybenzaldehyde and allowed the substrates access to Ag nanoparticles.On the contrary,under the condition of high temperature,becausethe thermal motion of the molecular chain in the imprinted polymer was strengthened,recognition sites in imprinted polymers were destroyed.The prepared imprinted polymers had no ability to identify specific substrates,and its selective descent.Therefore,the prepared imprinted catalyst reduced the specific substrate similar to the substrate analogues.The imprinted polymer catalysts prepared in this way exhibited a selective/nonselectiveswitchable catalytic performance.Based on the above work,we have developed a molecularly imprinted catalyst which could be used as a catalyst for continuous catalysis and a molecularly imprinted catalyst with selectivity-switchable.The regularity of the catalytic effect of molecular imprinting catalyst was also elucidated.And it provides the necessary theoretical and experimental basis for the effective use of molecularly imprinted polymer catalysts...