聚L-乳酸泡沫材料制备及油水分离应用

Fabrication of Poly(L-lactic acid)Foams and Its Application for Oil-Water Separation

以聚L-乳酸(PLLA)/四氢呋喃为淬火溶液,通过热致相分离法得到PLLA泡沫材料。泡沫由直径为(45±13)μm的多孔微球组成。以PLLA泡沫材料为油水分离材料,研究其对十二醇、机油、石蜡油和硅油的吸附和油水分离性能。实验结果表明,PLLA泡沫材料的比表面积和孔隙率分别高达13.9m^2/g和97.5%,水接触角(WCA)为141.8°,与普通PLLA流延膜相比水接触角约增加了70°。PLLA泡沫材料对4种油的吸附容量均大于12g/g,为流延膜的14~19倍。吸油容量的增加主要与泡沫材料的高孔隙率和大比表面积,及材料表面和内部的微/纳结构有关。由于超疏水性、亲油性和毛细管效应,PLLA泡沫材料可以快速吸收漂浮在水面上的油层,可作为一种理想的油水分离材料。

Poly(L-lactic acid)foams were prepared from its tetrahydrofuran solution through thermally induced phase separation.PLLA foams were composed of porous microspheres with the diameter of(45±13)μm.The adsorption capacities of PLLA foams toward dodecanol,engine oil,paraffin oil and silicone oil,and oil-water separation properties were investigated.The water contact angle of PLLA foams is 141.8°,which is about 70°higher than that of the solvent-cast film.Their surface areas and porosity reach up to 13.9 m^2/g and 97.5%,respectively.The uptake capacity of PLLA foams for four types of oils is greater than 12 g/g,which are 14~19 times that of the solvent-cast film.Owing to the high hydrophobicity,lipophilicity and massive capillary action,PLLA foams can quickly absorb oil in preference to water in an oil-water mixture,and can be used as eco-friendly oil-water separation material.