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Traditional petroleum\u2010based low dielectric substrates, led by polyimide, present several challenges, including higher cost, non\u2010renewability, difficulty in disposal and recycling, rendering them unsuitable for disposable applications. In this study, the asymmetric ethyl cellulose (EC) porous film with dense skins is prepared in one step by the evaporation process of EC\/ethanol\/H\n                    <jats:sub>2<\/jats:sub>\n                    O solution. The synergistic pore\u2010forming mechanism of the dry phase inversion technique and breath figure\u00a0phenomenon is proposed based on EC pore morphology. The relative permittivity of the asymmetric EC porous film is 2.02 \u00b1 0.03 (6\u00a0GHz), demonstrating satisfactory dielectric stability, printing adaptability, and bending ability. The EC in discarded printed antennas and remnants from the film\u2010making process can be separated and recovered through a simple dissolution and centrifugation process. The green and simple preparation process, extremely low manufacturing cost, excellent recyclability, and potential roll\u2010to\u2010roll process adaptability make asymmetric EC porous film highly competitive in the mid\u2010to\u2010low end and disposable centimetre wave radio frequency device substrate fields.\n                  <\/jats:p>","DOI":"10.1002\/adma.202507704","type":"journal-article","created":{"date-parts":[[2025,9,24]],"date-time":"2025-09-24T12:39:16Z","timestamp":1758717556000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["One\u2010Step Preparation of Ethyl Cellulose Films with Asymmetric Graded Pores for Low Dielectric Printing Substrates"],"prefix":"10.1002","volume":"38","author":[{"given":"Fukun","family":"Niu","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 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