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首页> 外文期刊>Journal of Applied Polymer Science >Sulfonated polystyrene brushes grafted onto magnetic nanoparticles as recoverable catalysts for efficient synthesis of ethyl N-phenylformimidate
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Sulfonated polystyrene brushes grafted onto magnetic nanoparticles as recoverable catalysts for efficient synthesis of ethyl N-phenylformimidate

机译：亚磺化聚苯乙烯刷涂到磁性纳米颗粒上作为可恢复催化剂，以有效合成乙基N-苯基甲酚

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摘要

In this work, the sulfonated polystyrene brushes were grafted onto magnetic nanoparticles to obtain recoverable catalysts for efficient synthesis of ethyl N-phenylformimidate. First, the surface modification of Fe(3)O(4)with a particle size of about 10 nm was performed with the silane coupling agent of vinyl triethoxysilane (SG-151) to obtain Fe(3)O(4)with carbon-carbon double bonds on the surface (SG-Fe3O4). Subsequently, SG-Fe3O4, styrene (St) and chloromethyl styrene (CMSt) were polymerized to obtain the magnetic chloromethylated polystyrene sphere (SG-Fe3O4@PS-Cl) with core-shell structure by solution copolymerization. Using St as monomer and SG-Fe3O4@PS-Cl as macromolecular initiator, the magnetic polystyrene brush of SG-Fe3O4@PS-PSt was obtained by activated regenerated electron transfer catalyst atom transfer radical polymerization. Finally, SG-Fe3O4@PS-PSt was sulfonated with sulfuric acid to form a magnetic sulfonated polystyrene brush of SG-Fe3O4@PS-PSH. SG-Fe3O4@PS-PSH was used as a recoverable acid catalyst to synthesize ethyl N-phenylformimidate. Due to the high loading of the sulfonic acid group of this catalyst, its added amount was lower than other solid acids such as p-toluenesulfonic acid. The results showed that the catalytic performance of SG-Fe3O4@PS-PSH was better than p-toluenesulfonic acid and commercial macroporous sulfonic acid resin. The external magnetic field can directly recover SG-Fe3O4@PS-PSH, simplifying the recovery of catalyst and reducing the catalyst loss. After recycling, the yield of ethyl N-phenylformimidate was not significantly decreased.
机译：在这项工作中，磺化聚苯乙烯刷被接枝到磁性纳米颗粒上，以获得高效合成N-苯基甲酸乙酯的可回收催化剂。首先，使用乙烯基三乙氧基硅烷硅烷偶联剂（SG-151）对粒径约为10nm的Fe（3）O（4）进行表面改性，以获得表面具有碳-碳双键的Fe（3）O（4）（SG-Fe3O4）。随后，将SG-Fe3O4、苯乙烯（St）和氯甲基苯乙烯（CMSt）聚合以获得磁性氯甲基化聚苯乙烯球（SG）-Fe3O4@PS-Cl）通过溶液共聚具有核壳结构。以St为单体，SG为单体-Fe3O4@PS-Cl作为高分子引发剂，SG的磁性聚苯乙烯刷-Fe3O4@PS-通过活化再生电子转移催化剂原子转移自由基聚合得到PSt。最后，SG-Fe3O4@PS-PSt用硫酸磺化，形成SG的磁性磺化聚苯乙烯刷-Fe3O4@PS-PSH。SG-Fe3O4@PS-以PSH为可回收酸催化剂合成N-苯基甲酸乙酯。由于该催化剂的磺酸基负载量高，其添加量低于其他固体酸，如对甲苯磺酸。结果表明，SG的催化性能-Fe3O4@PS-PSH优于对甲苯磺酸和商用大孔磺酸树脂。外磁场可以直接恢复SG-Fe3O4@PS-PSH，简化催化剂回收，减少催化剂损失。回收后，N-苯基甲酸乙酯的产率没有显著降低。

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