Supercritical CO₂ foaming of open‐cell polypropylene/ethylene propylene diene monomer composite foams with oriented cellular structures for water treatment

Abstract

Efficient treatment of tiny media in wastewater is a global challenge. Herein, an ingenious design to fabricate the highly open‐cell polypropylene (PP)/ethylene propylene diene monomer (EPDM) composite foams for water treatment by using supercritical CO2 (scCO2) extrusion foaming coupling with post‐stretching is presented. The tensile strain of high melt strength PP is fully utilized in an extensional flow field during foaming. Meanwhile, EPDM is added into PP matrix for obtaining the highly open‐cell and oriented porous structures. Interestingly, a variety of structural transformations (like uniform, hollow and oriented cellular structures) can be achieved during extrusion foaming. Furthermore, the effects of different cellular structures on their selective filtration properties are studied. More interestingly, the as‐prepared composite foam strips, with the highly open‐cell content (~94.4%) and orientation degree (~89.6%), exhibit excellent selective filtration performance, which can successfully remove waste with particle size larger than 1 μm (its filtration efficiency:~ 99.52%). Water droplets can easily pass through the lengthy foam strips in seconds, but tiny particles (like oil droplets or glass microbeads) will be blocked. This work provides a new pathway to prepare highly open‐cell composite foams with anisotropic porous structures for water treatment.

Mechanically Robust Foamed Polypropylene/Bamboo Powder Composite Basketworks by CO2 Extrusion Foaming

“…Specifically, Zhou et al investigated the effect of maleic anhydride-grafted PP for PP/bamboo (33 phr) composite foams, indicating that the interfacial compatibility of PP and BP was improved distinctly and demonstrating improved mechanical properties (like modulus) . Moreover, our previous studies found that high melt strength PP with tensile strain hardening characteristics has outstanding foaming behavior under external stress field and can obtain the gradient porous structures. , …”

“…33 Moreover, our previous studies found that high melt strength PP with tensile strain hardening characteristics has outstanding foaming behavior under external stress field and can obtain the gradient porous structures. 34,35 In this work, a facile strategy of extruding foaming−postcalendering procedure was used to prepare foamed PP/ bamboo powder (BP) composite fabrics with sandwich structures (like cellular−solid−cellular structures). The microstructure of prepared fabrics can be adjustable, and their thermal insulation and mechanical properties can be greatly improved.…”