Microcellular open-cell poly(L-lactic acid)/poly(D-lactic acid) foams for oil-water separation prepared via supercritical CO2 foaming

被引:23
作者
Yu, Kesong [1 ]
Wu, Yi [1 ]
Zhang, Xiaoli [1 ]
Hou, Junji [1 ]
Chen, Jingbo [1 ]
机构
[1] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China
基金
中国国家自然科学基金;
关键词
Poly(lactic acid); Stereocomplex crystal; SupercriticalCO2; foaming; Open-cell foam; Oil-water separation; CARBON-DIOXIDE; POLYMER FOAMS; GREEN; CRYSTALLIZATION; ADSORPTION; POLYLACTIDE; PERFORMANCE; SCAFFOLDS; BLENDS; POLYPROPYLENE;
D O I
10.1016/j.jcou.2022.102219
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Biodegradable polymer foams with excellent oil-water separation performance show significant advantages in the treatment of oily wastewater and oil spill cleanup. Herein, high-expansion poly(L-lactic acid) (PLLA)/poly(D- lactic acid) (PDLA) foams with microcellular open-cell structure were successfully fabricated by an eco-friendly supercritical CO2 foaming method. When the PDLA content was 2.5 wt% (D2.5), mesh-like structures which made cells connected appeared on cell walls due to the existence of stereocomplex crystals. The D2.5 foam prepared at 10 MPa and 115 degrees C had an expansion ratio of 41 and cell size of 48 mu m. The adsorption capacity was 12-45 g/g for oil/organic solvents and almost 0 g/g for water, which indicated that it could effectively separate oil from water. In addition, the adsorption capacity maintained around 84 % after 10 adsorption-desorption cycles. Moreover, the D2.5 foam exhibited a better heat resistance compared with PLLA foam. This work pro-vides a strategy for preparing fully bio-based and biodegradable foams applied to oil-water separation.
引用
收藏
页数:10
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