Morphological and Mechanical Characterization of Pinus radiata  Wood Treated with Two Organic Phase Change Materials via Vacuum Impregnation

Morphological and Mechanical Characterization of Pinus radiata Wood Treated with Two Organic Phase Change Materials via Vacuum Impregnation | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Morphological and Mechanical Characterization of Pinus radiata Wood Treated with Two Organic Phase Change Materials via Vacuum Impregnation Esteban Hermosilla-Dote, Franco Fuentes-Rampoldi, Tomás Venegas, and 4 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7870003/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract The present study examines the mechanical and morphological properties of Pinus radiata wood impregnated with two different organic phase change materials (PCM). Specifically, paraffin-type aliphatic PCM and fatty acid PCM were used to impregnate the samples in the tangential flow direction. The first aim is to analyze the effect of impregnation with a fatty acid on the morphological properties of wood, such as cell wall thickness, lumen diameter, tracheid diameter, and open ray pit diameter. Moreover, the research emphasizes wood's transport properties, such as longitudinal permeability—measuring fluid flow along the wood's longitudinal axis—and tangential permeability, which quantifies fluid flow perpendicular to the growth rings. These properties are correlated with the impregnation ratio using Pearson's correlation. Additionally, the study focuses on how impregnation with an aliphatic and fatty acid PCMs affects the mechanical properties of wood, specifically the variation in the longitudinal Young's modulus. The Young’s modulus was measured using the impulse excitation technique, following ASTM E1876. Experiments were conducted at three manometric pressures (55, 70, and 85 kPa) at two constant temperatures (30 \((^{\circ})\) C and 70 \((^{\circ})\) C). PCM incorporation ranged from 18 Wt.% to 80 Wt.% depending on pressure and time. The longitudinal Young’s modulus increased by up to 29.99%. Microscopic analysis showed a homogeneous distribution of PCM within the cellular microstructure. These findings suggest that O-PCM impregnation alters the mechanical properties of Pinus radiata wood by increasing stiffness and promoting uniform PCM distribution, supporting its potential application in passive thermal conditioning systems. Organic Phase Change Materials textit{Pinus radiata} Wood Anatomy Mechanical properties Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7870003","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":546378373,"identity":"76ae113b-da5c-42fb-80f0-cb9f467dd724","order_by":0,"name":"Esteban Hermosilla-Dote","email":"","orcid":"","institution":"Universidad de Santiago de Chile","correspondingAuthor":false,"prefix":"","firstName":"Esteban","middleName":"","lastName":"Hermosilla-Dote","suffix":""},{"id":546378374,"identity":"2a2bc0e2-75d8-4e3b-a8a0-9d5ebf223989","order_by":1,"name":"Franco Fuentes-Rampoldi","email":"","orcid":"","institution":"Universidad de Santiago de Chile","correspondingAuthor":false,"prefix":"","firstName":"Franco","middleName":"","lastName":"Fuentes-Rampoldi","suffix":""},{"id":546378375,"identity":"2c6134ef-92ef-4209-b05b-07fe12a4a97e","order_by":2,"name":"Tomás Venegas","email":"","orcid":"","institution":"Universidad de Santiago de Chile","correspondingAuthor":false,"prefix":"","firstName":"Tomás","middleName":"","lastName":"Venegas","suffix":""},{"id":546378376,"identity":"01b41af7-225d-41d3-a6d6-f6e47f39ebf1","order_by":3,"name":"Claudio García-Herrera","email":"","orcid":"","institution":"Universidad de Santiago de Chile","correspondingAuthor":false,"prefix":"","firstName":"Claudio","middleName":"","lastName":"García-Herrera","suffix":""},{"id":546378377,"identity":"d1fd9e47-8787-4c75-9b6b-cb53b059c9b5","order_by":4,"name":"Carlos Salinas-Lira","email":"","orcid":"","institution":"University of Bío-Bío","correspondingAuthor":false,"prefix":"","firstName":"Carlos","middleName":"","lastName":"Salinas-Lira","suffix":""},{"id":546378378,"identity":"a07aa3eb-2958-4229-b55e-08c58095e0dc","order_by":5,"name":"Erick Saavedra Flores","email":"","orcid":"","institution":"Universidad de Santiago de Chile","correspondingAuthor":false,"prefix":"","firstName":"Erick","middleName":"Saavedra","lastName":"Flores","suffix":""},{"id":546378379,"identity":"10c11f95-3b3d-44b5-bbee-8e9656d9e4a8","order_by":6,"name":"Diego A. 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Impregnation","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"Organic Phase Change Materials, textit{Pinus radiata}, Wood Anatomy, Mechanical 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Specifically, paraffin-type aliphatic PCM and fatty acid PCM were used to impregnate the samples in the tangential flow direction. The first aim is to analyze the effect of impregnation with a fatty acid on the morphological properties of wood, such as cell wall thickness, lumen diameter, tracheid diameter, and open ray pit diameter. Moreover, the research emphasizes wood's transport properties, such as longitudinal permeability\u0026mdash;measuring fluid flow along the wood's longitudinal axis\u0026mdash;and tangential permeability, which quantifies fluid flow perpendicular to the growth rings. These properties are correlated with the impregnation ratio using Pearson's correlation. Additionally, the study focuses on how impregnation with an aliphatic and fatty acid PCMs affects the mechanical properties of wood, specifically the variation in the longitudinal Young's modulus. The Young\u0026rsquo;s modulus was measured using the impulse excitation technique, following ASTM E1876. Experiments were conducted at three manometric pressures (55, 70, and 85 kPa) at two constant temperatures (30 \u003cspan class=\"InlineEquation\"\u003e\u003cspan class=\"mathinline\"\u003e\\((^{\\circ})\\)\u003c/span\u003e\u003c/span\u003eC and 70 \u003cspan class=\"InlineEquation\"\u003e\u003cspan class=\"mathinline\"\u003e\\((^{\\circ})\\)\u003c/span\u003e\u003c/span\u003eC). PCM incorporation ranged from 18 Wt.% to 80 Wt.% depending on pressure and time. The longitudinal Young\u0026rsquo;s modulus increased by up to 29.99%. Microscopic analysis showed a homogeneous distribution of PCM within the cellular microstructure. These findings suggest that O-PCM impregnation alters the mechanical properties of \u003cem\u003ePinus radiata\u003c/em\u003e wood by increasing stiffness and promoting uniform PCM distribution, supporting its potential application in passive thermal conditioning systems. \u003c/p\u003e","manuscriptTitle":"Morphological and Mechanical Characterization of Pinus radiata Wood Treated with Two Organic Phase Change Materials via Vacuum Impregnation","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-11-18 06:57:12","doi":"10.21203/rs.3.rs-7870003/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"8a720db3-77cf-48d8-a222-7f9f6db4a497","owner":[],"postedDate":"November 18th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2026-02-04T15:34:27+00:00","versionOfRecord":[],"versionCreatedAt":"2025-11-18 06:57:12","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-7870003","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7870003","identity":"rs-7870003","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}