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首先通过无皂乳液聚合制得聚苯乙烯(PS)种子乳液,再加入苯乙烯磺酸钠继续进行无皂乳液聚合,得到核壳结构的苯乙烯-苯乙烯磺酸钠共聚物微球(PS-Na SS@PS),然后酸化,得到表面磺酸化的苯乙烯-苯乙烯磺酸微球(PS-HSS@PS)。以PS-HSS@PS作为可回收的催化剂合成N-(乙氧基亚甲基)苯胺,并与对甲苯磺酸、商品化的强酸阳离子交换树脂的催化性能进行对比,结果表明,PS-HSS@PS的磺酸基含量和加入量对催化性能影响较大,磺酸基含量较高的PS-HSS@PS催化性能优异,产物收率可达97%,其活性优于强酸阳离子交换树脂(收率89%),与对甲苯磺酸相当(收率98%),且循环使用性能良好,循环使用5次,收率仍可达97%左右。
Firstly, polystyrene (PS) seed emulsion was prepared by soap-free emulsion polymerization, then sodium styrenesulfonate was added to continue soap-free emulsion polymerization to obtain core-shell styrene-styrene sulfonate copolymer microspheres -Na SS @ PS) and then acidified to give surface sulfonated styrene-styrene sulfonic acid microspheres (PS-HSS @ PS). The synthesis of N- (ethoxymethylene) aniline with PS-HSS @ PS as a recyclable catalyst was compared with that of p-toluenesulfonic acid, a commercially available strong acid cation exchange resin. The results showed that PS-HSS The sulfonic acid group content and amount of @PS greatly influenced the catalytic performance. The PS-HSS @ PS with high content of sulfonic acid group had excellent catalytic performance and yield of 97%, which was better than that of strong acid cation exchange resin Yield 89%), and p-toluenesulfonic acid equivalent (yield 98%), and good recycling performance, recycling 5 times, the yield can still be up to 97%.