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首页> 外文期刊>RSC Advances >Pickering emulsions stabilized by palygorskite particles grafted with pH-responsive polymer brushes
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Pickering emulsions stabilized by palygorskite particles grafted with pH-responsive polymer brushes

机译：由凹凸棒石颗粒与pH响应聚合物刷接枝稳定的Pickering乳液

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摘要

Poly(2-(diethylamino) ethyl methacrylate (PDEAEMA) was grafted from the surface of palygorskite (PAL) particulates via Cu(0) radical polymerization to form PAL-PDEAEMA nanocomposites. The successful grafting was confirmed by Fourier transform infrared (FT-IR), thermal gravimetric analysis (TGA), and elemental analysis (EA). Water (pH 9)/toluene (W/O) Pickering emulsions stabilized by PAL-PDEAEMA particles were prepared. Spherical emulsion droplets with absorbed small PAL-PDEAEMA aggregates on the interface were observed via scanning electron microscopy (SEM), polarizing optical microscopy (POM) and optical microscopy (OM). The size of the emulsion droplets was decreased with the increase of PAL-PDEAEMA particle concentrations, and reached a limited value at 2 wt%. By changing the pH of water (pH <3), O/W Pickering emulsions were formed by the same PAL-PDEAEMA particles. Moreover, W/O emulsion-de-emulsion-O/W emulsion transitions can be realized simply by adding HCl/NaOH, which can last at least 7 successive cycles. Therefore, a reversible Pickering emulsion system switched by pH can result on the basis of PAL-PDEAEMA particles.
机译：通过Cu（0）自由基聚合从坡缕石（PAL）颗粒表面接枝聚（2-（二乙氨基）乙基甲基丙烯酸乙酯（PDEAEMA），形成PAL-PDEAEMA纳米复合材料。傅里叶变换红外光谱（FT-IR）证实成功接枝），热重分析（TGA）和元素分析（EA），制备了由PAL-PDEAEMA颗粒稳定的水（pH 9）/甲苯（W / O）Pickering乳液，并在其上吸附了小PAL-PDEAEMA聚集了球形乳液滴通过扫描电子显微镜（SEM），偏振光学显微镜（POM）和光学显微镜（OM）观察界面，乳液液滴的大小随PAL-PDEAEMA颗粒浓度的增加而减小，并在2时达到极限值。通过改变水的pH值（pH <3），由相同的PAL-PDEAEMA颗粒形成O / W Pickering乳液，而且，W / O乳液-去乳液-O / W乳液的转变可以简单地实现通过加入HCl / NaOH可以持续至少连续7个周期。因此，在PAL-PDEAEMA颗粒的基础上，可以得到通过pH转换的可逆Pickering乳液系统。

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