{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T20:55:20Z","timestamp":1790110520449,"version":"4.0.1"},"reference-count":51,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2023,4,30]],"date-time":"2023-04-30T00:00:00Z","timestamp":1682812800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Coordination for the Improvement of Higher Education Personnel (CAPES), Brazil (Finance Code 001) and the Brazilian National Council of Scientific Technological and Innovation Development (CNPq)","award":["403140\/2019-6"],"award-info":[{"award-number":["403140\/2019-6"]}]},{"name":"Coordination for the Improvement of Higher Education Personnel (CAPES), Brazil (Finance Code 001) and the Brazilian National Council of Scientific Technological and Innovation Development (CNPq)","award":["E-26\/202.045\/2020"],"award-info":[{"award-number":["E-26\/202.045\/2020"]}]},{"name":"State of Rio de Janeiro Research Support Foundation","award":["403140\/2019-6"],"award-info":[{"award-number":["403140\/2019-6"]}]},{"name":"State of Rio de Janeiro Research Support Foundation","award":["E-26\/202.045\/2020"],"award-info":[{"award-number":["E-26\/202.045\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Natural fibers have some advantages in comparison to synthetic fibers, especially because they are more environmentally friendly. For this reason, using them as a reinforcement for polymeric matrices is growing exponentially. However, they present the disadvantage of having the hydrophilic nature, which strongly reduces the interface interaction. Sedge fibers have been investigated when reinforcing an epoxy matrix in terms of ballistic properties and mechanical performance. Aiming to enhance the fiber\u2212matrix interface, an alkali treatment was proposed. The group conditions were divided into three NaOH concentrations (3%, 5%, and 10%), as well as the three periods of immersion (24, 48, and 72 h). Therefore, nine different conditions were investigated in terms of their thermal behaviors, chemical structures, physical structures, and morphological aspects. Based on TGA curves, it could be noticed that treatments related to 3% NaOH for 24 h and 48 h exhibited better thermal stability properties. For the time of 48 h, better thermal stability with for a decay of the thermal DSC curve was shown for all treatment conditions. The FTIR spectra has shown a reduction of waxes for higher NaOH concentrations. The XRD diffractogram exhibited an increase in the crystallinity index only for 5% NaOH and an immersion time of 48 h. The morphological aspects of fibers treated with 5% and 10% of NaOH have shown that the treatments have damaged the fiber, which highlighted the crystallinity index reductions.<\/jats:p>","DOI":"10.3390\/polym15092153","type":"journal-article","created":{"date-parts":[[2023,5,1]],"date-time":"2023-05-01T12:10:03Z","timestamp":1682943003000},"page":"2153","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Alkaline Treatment Investigation for Sedge Fibers (Cyperus malaccensis): A Promising Enhancement"],"prefix":"10.3390","volume":"15","author":[{"given":"Lucas de Mendon\u00e7a","family":"Neuba","sequence":"first","affiliation":[{"name":"Department of Materials Science, Military Institute of Engineering, Rio de Janeiro 22290-270, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ra\u00ed Felipe Pereira","family":"Junio","sequence":"additional","affiliation":[{"name":"Department of Materials Science, Military Institute of Engineering, Rio de Janeiro 22290-270, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andressa Teixeira","family":"Souza","sequence":"additional","affiliation":[{"name":"Department of Materials Science, Military Institute of Engineering, Rio de Janeiro 22290-270, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yago Soares","family":"Chaves","sequence":"additional","affiliation":[{"name":"Department of Materials Science, Military Institute of Engineering, Rio de Janeiro 22290-270, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sheron","family":"Tavares","sequence":"additional","affiliation":[{"name":"Materials Science and Engineering Program, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexandre Alvarenga","family":"Palmeira","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, University of Rio de Janeiro State, Resende 27537-000, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1208-1234","authenticated-orcid":false,"given":"Sergio Neves","family":"Monteiro","sequence":"additional","affiliation":[{"name":"Department of Materials Science, Military Institute of Engineering, Rio de Janeiro 22290-270, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5882-9781","authenticated-orcid":false,"given":"Artur Camposo","family":"Pereira","sequence":"additional","affiliation":[{"name":"Department of Materials Science, Military Institute of Engineering, Rio de Janeiro 22290-270, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Rocha, D.L., J\u00fanior, L.U.D.T., Marvila, M.T., Pereira, E.C., Souza, D., and Azevedo, A.R.G. 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