期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 139, 期 43, 页码 -出版社
WILEY
DOI: 10.1002/app.53068
关键词
extrusion; foams; structure-property relationships; thermoplastics
资金
- National Natural Science Foundation of China [52103048]
- hinese Academy of Sciences Pioneer Hundred Talents Program and S&T Innovation 2025 Major Special Program of Ningbo [2019B10092, 2018B10044]
- Provincial Key Research and Development Program of Zhejiang [2021C01005]
- STS Project of Fujian-CAS [2020T3012, 2021T3029]
- STS Project of Putian-CAS [2020HJSTS008]
Efficient treatment of tiny media in wastewater is a global challenge. This study presents an ingenious design to fabricate highly open-cell polypropylene/ethylene propylene diene monomer composite foams for water treatment using supercritical CO2 extrusion foaming. The resulting composite foams exhibit excellent selective filtration performance.
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 (scCO(2)) 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 (similar to 94.4%) and orientation degree (similar to 89.6%), exhibit excellent selective filtration performance, which can successfully remove waste with particle size larger than 1 mu m (its filtration efficiency:similar to 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.
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