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In this study, the structural, thermal, mechanical, and chemical characteristics of Cyperus papyrus fibers were comprehensively evaluated to assess their potential as reinforcement materials for polymeric composites. The fibers exhibited an average diameter of 164.87 \u00b5m, with tensile strength and Young\u2019s modulus values of 141.95 \u00b1 89.33 MPa and 11.15 GPa, respectively. Scanning electron microscopy revealed a rough and irregular surface morphology characteristic of untreated lignocellulosic fibers. X-ray diffraction analysis indicated a crystallinity index of 70.15%, while thermogravimetric analysis demonstrated stability up to 220 \u00b0C. Chemical composition analysis revealed high \u03b1-cellulose content (63.3%) and moderate lignin levels, contributing to a balance between stiffness and processability. The significant relationship observed between fiber diameter and tensile behavior, together with the structural, chemical, and thermal characteristics of the fibers, provides a broader understanding of the structure\u2013property relationships relevant to their potential use as sustainable reinforcement materials. Overall, C. papyrus fibers represent a promising bio-derived material for environmentally conscious engineering applications.<\/jats:p>","DOI":"10.3390\/polym18182219","type":"journal-article","created":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T13:29:29Z","timestamp":1789133369000},"page":"2219","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Structure\u2013Property Relationships of Cyperus papyrus Fibers as Sustainable Reinforcements for Polymeric Composites"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-3032-8134","authenticated-orcid":false,"given":"Mateus Urbano do","family":"Nascimento","sequence":"first","affiliation":[{"name":"Department of Chemical Engineering, Federal University of Esp\u00edrito Santo, Alegre 29500-000, ES, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-7069-5408","authenticated-orcid":false,"given":"Felipe Gabriel Santos","family":"Ara\u00fajo","sequence":"additional","affiliation":[{"name":"Department of Forestry and Wood Sciences, Federal University of Esp\u00edrito Santo, Jer\u00f4nimo Monteiro 29550-000, ES, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hemanuelly Ferreira Breda Lan","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering, Federal University of Esp\u00edrito Santo, Alegre 29500-000, ES, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Felipe Periss\u00e9 Duarte","family":"Lopes","sequence":"additional","affiliation":[{"name":"Materials Science and Engineering Department, State University of North Fluminense, Campos dos Goytacazes 28013-602, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4948-0482","authenticated-orcid":false,"given":"Henry Alonso Colorado","family":"Lopera","sequence":"additional","affiliation":[{"name":"CCComposities Laboratory, University of Antioquia, Medellin 050010, Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9241-0194","authenticated-orcid":false,"given":"Michel Pican\u00e7o","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Department of Forestry and Wood Sciences, Federal University of Esp\u00edrito Santo, Jer\u00f4nimo Monteiro 29550-000, ES, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Priyadarshini, S., Soren, S., and Durga, G. 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