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Thiol Oxidative Coupling Synthesis of Silicone Foams for Oil/Water Separation
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-03-05 , DOI: 10.1021/acsapm.0c00071
Jianpan Yan 1 , Jinfeng Cao 1 , Lei Xue 2 , Shengyu Feng 1 , Haijun Zhang 3 , Dengxu Wang 1
Affiliation  

Developing a facile and rapid method to prepare silicone foams is highly desirable. In this work, silicone foams (SFs) were fabricated using a simple and rapid strategy, that is, thiol oxidative coupling reaction of poly[(mercaptopropyl)methyldimethylsiloxane] (PMMS) using hydrogen peroxide as the oxidant at room temperature. In this strategy, it is possible to manipulate the outcome of a single process, in which the cross-linking of PMMS and foaming generation simultaneously occur. The foamed structures of the SFs can be controlled and easily tuned from closed cells to open cells with a variety of densities (0.13–0.44 g cm–3) by altering various factors, including solvent species, the volume of the solvent, the amounts of oxidant and catalyst, the molecular weight of PMMS, and the −SH content in PMMS. As expected, the SFs are compressible with a stress of 0.58 MPa at 80% strain (SF-7) and exhibit low thermal conductivity, indicating their potential as thermal insulation materials. They also show excellent oleophilic and hydrophobic properties and can rapidly absorb various oils with the capacities in the range of 7.82–37.29 g g–1 within 2 min. Moreover, they can rapidly separate the oil/water mixture with efficiencies of 98.5 and 98.8% for gasoline and chloroform, respectively, as oils and oil-in-water emulsions with a very high efficiency of 99.7%. These results suggest that these foams can be promisingly utilized as efficient absorbents for oil/water separation. More organic foams can be designed and fabricated by selecting thiol-containing polymers and using H2O2 as the oxidant, and their extensive applications can be explored in oil/water separation, thermal insulators, catalysis, strain sensors, and so forth.

中文翻译:

油/水分离用硅酮泡沫的硫醇氧化偶联合成

迫切需要开发一种容易且快速的方法来制备有机硅泡沫。在这项工作中,有机硅泡沫塑料(SFs)使用简单而快速的策略制造,即在室温下使用过氧化氢作为氧化剂的聚[(巯基丙基)甲基二甲基硅氧烷](PMMS)的硫醇氧化偶联反应。在这种策略中,可以控制单个过程的结果,在该过程中,PMMS的交联和泡沫的产生同时发生。SF的泡沫结构可以控制,并且可以很容易地从闭孔调整为具有各种密度(0.13-0.44 g cm -3的开孔)。),可以更改各种因素,包括溶剂种类,溶剂量,氧化剂和催化剂的量,PMMS的分子量以及PMMS中的-SH含量。正如预期的那样,SF在80%应变(SF-7)时可压缩,应力为0.58 MPa,导热系数低,表明它们具有作为隔热材料的潜力。它们还显示出优异的亲油和疏水性能,并能以7.82–37.29 gg –1的容量快速吸收各种油。2分钟内 此外,它们可以快速分离油/水混合物,对汽油和氯仿而言分别为98.5和98.8%,效率高达99.7%,是油和水包油型乳液。这些结果表明,这些泡沫有望被用作油/水分离的有效吸收剂。通过选择含硫醇的聚合物并使用H 2 O 2作为氧化剂,可以设计和制造更多的有机泡沫,并且可以在油/水分离,隔热,催化,应变传感器等方面探索其广泛的应用。
更新日期:2020-04-23
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