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djshaofei新虫 (初入文坛)
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2009年邓春辉Angew chemie的Fe3O4@SiO2@PMMA聚合不需要引发剂么？？
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百思不得其解呀 前文不赘述了，Fe3O4@SiO2-MPS 已经合成好了 要往上面修饰PMMA了， The sandwich structured Fe3O4@SiO2@PMMA microspheres were synthesized via an aqueous-phase radical polymerization. Typically, in a three-necked round bottom flask (100 mL) equipped with a mechanical stirrer, a refluxing condenser, and a nitrogen inlet, 10 mL of ethanol dispersion of Fe3O4@SiO2-MPS microspheres were mixed with 50 mL of aqueous solution containing 5.0 mg of sodium lauryl benzenesulfate under mechanically stirring. After stirring for 1h, 1.0 g of MMA monomers were added, and the resultant dispersion was bubbled with high-purity nitrogen gas for 0.5 h. Then, the flask was immerged into a preheated oil bath at 70oC and the polymerization was carried out with a stirring speed of 200 rpm at 70°C for 24 h. The resulting Fe3O4@SiO2@PMMA microspheres were harvested and washed by magnetic separation. 通了半个小时氮气，往70度水里面一放，就开始聚合了？什么来引发呢？ 难道是（MPS，或者十二烷基苯磺酸钠？） 另外半个小时通氮气吹走氧气这个好理解，之后的聚合要不要继续鼓气呢？ 不通气的话，岂不是回流冷凝管也要堵上，要不然氧气不是又进来了？ |
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