乳酸
超临界流体
化学工程
材料科学
流变学
色谱法
化学
复合材料
有机化学
细菌
遗传学
生物
工程类
作者
Kesong Yu,Yi Wu,Xiaoli Zhang,Junji Hou,Jingbo Chen
标识
DOI:10.1016/j.jcou.2022.102219
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 CO 2 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 °C had an expansion ratio of 41 and cell size of 48 µm. 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 provides a strategy for preparing fully bio-based and biodegradable foams applied to oil-water separation. • Microcellular open-cell poly(lactic acid) foams were successfully prepared. • The existence of stereocomplex crystals made foams have a mesh-like structure. • Foams with 2.5 wt% poly( d -lactic acid) had a good oil-water separation ability. • Foams containing stereocomplex crystals exhibited an excellent heat resistance.
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