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djshaofei新蟲 (初入文壇)
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2009年鄧春輝Angew chemie的Fe3O4@SiO2@PMMA聚合不需要引發(fā)劑么??
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百思不得其解呀 前文不贅述了,Fe3O4@SiO2-MPS 已經合成好了 要往上面修飾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. 通了半個小時氮氣,往70度水里面一放,就開始聚合了?什么來引發(fā)呢? 難道是(MPS,或者十二烷基苯磺酸鈉?) 另外半個小時通氮氣吹走氧氣這個好理解,之后的聚合要不要繼續(xù)鼓氣呢? 不通氣的話,豈不是回流冷凝管也要堵上,要不然氧氣不是又進來了? |
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