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Highly Durable Superhydrophobic Polymer Foams Fabricated by Extrusion and Supercritical CO2 Foaming for Selective Oil Absorption
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-01-23 00:00:00 , DOI: 10.1021/acsami.8b21858
Hao-Yang Mi 1, 2 , Xin Jing 1 , Yuejun Liu 1 , Lengwan Li 3 , Heng Li 2 , Xiang-Fang Peng 3 , Huamin Zhou 4
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The severe water contamination caused by oil leakage is calling for low-cost and high-performance absorbent materials for selective oil removal. In this study, a scalable green method was proposed to produce polypropylene (PP)/poly(tetrafluoroethylene) (PTFE) composite foams via conventional processing techniques including twin-screw extrusion and supercritical carbon dioxide foaming. To produce the superhydrophobic foam, micro- and nanosized PTFE particles were melt blended with PP and subsequently foamed. Ascribed to the nanofibrillation of microsized PTFE during processing, the fabricated foam exhibited a special highly porous structure with PTFE nanofibrils and nanoparticles uniformly distributed on the pore surfaces within the PP matrix, which resulted in a remarkably high water contact angle of 156.8° and a low contact angle hysteresis of 1.9°. Unlike traditional surface-modified superhydrophobic absorbers, the foams prepared are entirely superhydrophobic, which means that they remain superhydrophobic when being fractured or cut. Moreover, they are highly durable and maintained the superhydrophobicity when subjected to ultrasonication and mechanical sanding. When used in selective oil absorption, the durable foams exhibited excellent absorption efficiency and high stability in repetitive and long-term use. These advantages make the PP/PTFE foam a promising superabsorbent material for water remediation.

中文翻译:

挤出和超临界CO 2发泡制造的用于选择吸油的高度耐用的超疏水聚合物泡沫

由漏油引起的严重水污染要求使用低成本和高性能的吸收性材料来选择性去除油。在这项研究中,提出了一种可扩展的绿色方法,该方法通过传统的加工技术(包括双螺杆挤出和超临界二氧化碳发泡)生产聚丙烯(PP)/聚四氟乙烯(PTFE)复合泡沫。为了生产超疏水泡沫,将微米级和纳米级的PTFE颗粒与PP熔融共混,然后发泡。归因于加工过程中微米级PTFE的纳米原纤化,所制造的泡沫表现出特殊的高度多孔结构,其中PTFE纳米原纤和纳米颗粒均匀地分布在PP基体内的孔表面上,从而导致156.8°的极高水接触角和低的接触角迟滞为1。9°。与传统的表面改性超疏水性吸收剂不同,所制备的泡沫完全是超疏水性的​​,这意味着它们在断裂或切割时仍保持超疏水性。此外,它们具有极高的耐用性,并且在进行超声波处理和机械打磨时保持超疏水性。当用于选择性吸油时,耐用泡沫在重复和长期使用中表现出出色的吸收效率和高稳定性。这些优点使PP / PTFE泡沫成为一种有望用于水修复的超吸收性材料。它们具有极高的耐用性,并且在进行超声波和机械打磨时保持超疏水性。当用于选择性吸油时,耐用泡沫在重复和长期使用中表现出出色的吸收效率和高稳定性。这些优点使PP / PTFE泡沫成为一种有望用于水修复的超吸收性材料。它们具有极高的耐用性,并且在进行超声波和机械打磨时保持超疏水性。当用于选择性吸油时,耐用泡沫在重复和长期使用中表现出出色的吸收效率和高稳定性。这些优点使PP / PTFE泡沫成为一种有望用于水修复的超吸收性材料。
更新日期:2019-01-23
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