Effect of process variable on production of thermoplastic vulcanizates based on SEBS/PP/LLDPE via reactive extrusion

Effect of process variable on production of thermoplastic vulcanizates based on SEBS/PP/LLDPE via reactive extrusion | 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 Effect of process variable on production of thermoplastic vulcanizates based on SEBS/PP/LLDPE via reactive extrusion Mehri Dana, Mohammad Reza Nabid, Gholam Hossein Zohuri, Saeid Asadi Shahidi, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4598315/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 15 Jan, 2025 Read the published version in Polymer Bulletin → Version 1 posted 9 You are reading this latest preprint version Abstract Properties of thermoplastic vulcanizates (TPVs) depend on their microstructure. Processing conditions including shear rate, processing temperature and shearing time can affect the final microstructure of TPVs. Morphological study of resultant TPVs was carried out using a scanning electron microscope (SEM). The object of this study is to investigate the effect of temperature (210–230°C, 170–190°C, 150–170°C and 140–160°C) and speed of production process on the properties of TPV based on poly(styrene-b-(ethylene-co-butylene)-b styrene) triblock copolymer (SEBS)/polypropylene (PP)/linear low-density polyethylene (LLDPE) prepared via reactive extrusion. Melt flow index (MFI) of the prepared samples was sharply decreased (from 24.4 to 2.63 g/10 min at 190°C, 10 kg) with decreasing temperature (from 210–230°C to 170–190°C). However, hardness of the prepared TPVs was increased to a limiting value (80 shore A) with decreasing the process temperature. Compression set sharply decreased (from 70–49% at 120°C, 70 h) and it has reached to a limiting value (46%). The process temperature, however, is not significantly affected on the tensile strength and tensile strength at 20% extension of the TPV. The elongation has the lowest value in 170–190°C. Result of elongation at break after aging was improved (from 12.2–3.3%) with decreasing process temperature (from 140–160°C to 210–230°C). The lowest value of tensile strength (4.1%) was obtained in 170–190°C after aging. Due to the increase in speeds of the twin screw extruder (180 to 250 rpm, in 140–160°C) surface quality was suitable and smooth. Also TPV samples were prepared by either one-step or two-step reactors using the extruder system and the results were compared. In the one-step method, a pronounced higher value in elongation at break (897%) and MFI (6.8 g/10 min at 190°C, 10 kg) were observed. It was found that the results of heat aging were improved using the two-step process. The two-step process led to higher tensile stress at 20% extension (from 2.7 to 3.3 MPa), too. In addition, a comprehensive experimental study was carried out to achieve the optimal process conditions for the production of TPVs using the two-step process. In one method (method A), the curing agent was added in the first step of the production. Other components such as PP, antioxidant, which may interfere with the peroxide curing were mixed in the second step of the process. In another method (method B), thermoplastic elastomer (TPE) was produced in the first step, and then curing agent was added in the second step of the productions. The TPV then was prepared in the second step of the process. Generally, the results show that the properties of the prepared TPV with the method B are superior to the method A. TPV SEBS peroxide curing temperature profiles extrusion speed surface quality twin screw extruder Full Text Additional Declarations No competing interests reported. Supplementary Files Highlights.docx Cite Share Download PDF Status: Published Journal Publication published 15 Jan, 2025 Read the published version in Polymer Bulletin → Version 1 posted Editorial decision: Revision requested 13 Nov, 2024 Reviewers agreed at journal 03 Nov, 2024 Reviews received at journal 03 Nov, 2024 Reviewers agreed at journal 02 Nov, 2024 Reviewers agreed at journal 04 Oct, 2024 Reviewers invited by journal 16 Sep, 2024 Editor assigned by journal 18 Jun, 2024 Submission checks completed at journal 18 Jun, 2024 First submitted to journal 18 Jun, 2024 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. 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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-4598315","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":316227994,"identity":"91eece03-d224-47af-8d54-bfe92c2bae09","order_by":0,"name":"Mehri Dana","email":"","orcid":"","institution":"Shahid Beheshti University","correspondingAuthor":false,"prefix":"","firstName":"Mehri","middleName":"","lastName":"Dana","suffix":""},{"id":316227995,"identity":"f695bfc0-39d3-4677-a381-cd15536021ab","order_by":1,"name":"Mohammad Reza Nabid","email":"","orcid":"","institution":"Shahid Beheshti 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Processing conditions including shear rate, processing temperature and shearing time can affect the final microstructure of TPVs. Morphological study of resultant TPVs was carried out using a scanning electron microscope (SEM). The object of this study is to investigate the effect of temperature (210\u0026ndash;230\u0026deg;C, 170\u0026ndash;190\u0026deg;C, 150\u0026ndash;170\u0026deg;C and 140\u0026ndash;160\u0026deg;C) and speed of production process on the properties of TPV based on poly(styrene-b-(ethylene-co-butylene)-b styrene) triblock copolymer (SEBS)/polypropylene (PP)/linear low-density polyethylene (LLDPE) prepared via reactive extrusion. Melt flow index (MFI) of the prepared samples was sharply decreased (from 24.4 to 2.63 g/10 min at 190\u0026deg;C, 10 kg) with decreasing temperature (from 210\u0026ndash;230\u0026deg;C to 170\u0026ndash;190\u0026deg;C). However, hardness of the prepared TPVs was increased to a limiting value (80 shore A) with decreasing the process temperature. Compression set sharply decreased (from 70\u0026ndash;49% at 120\u0026deg;C, 70 h) and it has reached to a limiting value (46%). The process temperature, however, is not significantly affected on the tensile strength and tensile strength at 20% extension of the TPV. The elongation has the lowest value in 170\u0026ndash;190\u0026deg;C. Result of elongation at break after aging was improved (from 12.2\u0026ndash;3.3%) with decreasing process temperature (from 140\u0026ndash;160\u0026deg;C to 210\u0026ndash;230\u0026deg;C). The lowest value of tensile strength (4.1%) was obtained in 170\u0026ndash;190\u0026deg;C after aging. Due to the increase in speeds of the twin screw extruder (180 to 250 rpm, in 140\u0026ndash;160\u0026deg;C) surface quality was suitable and smooth. Also TPV samples were prepared by either one-step or two-step reactors using the extruder system and the results were compared. In the one-step method, a pronounced higher value in elongation at break (897%) and MFI (6.8 g/10 min at 190\u0026deg;C, 10 kg) were observed. It was found that the results of heat aging were improved using the two-step process. The two-step process led to higher tensile stress at 20% extension (from 2.7 to 3.3 MPa), too. In addition, a comprehensive experimental study was carried out to achieve the optimal process conditions for the production of TPVs using the two-step process. In one method (method A), the curing agent was added in the first step of the production. Other components such as PP, antioxidant, which may interfere with the peroxide curing were mixed in the second step of the process. In another method (method B), thermoplastic elastomer (TPE) was produced in the first step, and then curing agent was added in the second step of the productions. The TPV then was prepared in the second step of the process. 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