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The objective of this work was to develop unsaturated polyester prepolymers based on building blocks derived from renewable raw materials, namely, biobased isosorbide, 1,3\u2010propanediol, and fumaric acid, with petroleum\u2010derived phthalic anhydride. The prepolymers developed herein behaved as low\u2010molecular weight macromolecules (oligoesters), with <jats:italic>M<\/jats:italic><jats:sub>n<\/jats:sub> varying between 1.2 and 1.5\u00a0kDa, but achieved a high bio\u2010content of up to 87.1\u00a0wt%. The prepolymers were incorporated into reactive diluents comprising a blend of 2\u2010hydroxyethyl methacrylate and styrene, formulated to be eco\u2010friendlier and less toxic than typical styrene\u2010only incorporation approach, thus resulting in resins with viscosities between 750 and 950\u2009cP. These resins are suitable for use in various fiber\u2010reinforced polymer production techniques, such as manual lamination, vacuum infusion, and pultrusion, having the benefit of presenting over 50\u2009wt% of bio\u2010content in some formulations. Moreover, the crosslinked polyester resins (thermosets) exhibit comparable mechanical and thermomechanical behavior to their petrochemical\u2010based counterparts, with modulus of elasticity and tensile strength of up to 3.9\u00a0GPa and 62.1\u00a0MPa, respectively, and glass transition temperatures of up to 106\u00b0C, making them greener alternatives for high\u2010performance structural applications.<\/jats:p>","DOI":"10.1002\/app.53029","type":"journal-article","created":{"date-parts":[[2022,8,29]],"date-time":"2022-08-29T11:59:07Z","timestamp":1661774347000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Development of high\u2010performance partially biobased thermoset polyester using renewable building blocks from isosorbide, 1,3\u2010propanediol, and fumaric acid"],"prefix":"10.1002","volume":"139","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4357-3840","authenticated-orcid":false,"given":"Mateus","family":"Hofmann","sequence":"first","affiliation":[{"name":"Civil Engineering Research and Innovation for Sustainability Instituto Superior T\u00e9cnico  Lisbon Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2323-0776","authenticated-orcid":false,"given":"M\u00e1rio","family":"Garrido","sequence":"additional","affiliation":[{"name":"Civil Engineering Research and Innovation for Sustainability Instituto Superior T\u00e9cnico  Lisbon Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1991-4585","authenticated-orcid":false,"given":"Marina","family":"Machado","sequence":"additional","affiliation":[{"name":"Civil Engineering Research and Innovation for Sustainability Instituto Superior T\u00e9cnico  Lisbon Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5485-136X","authenticated-orcid":false,"given":"Jo\u00e3o R","family":"Correia","sequence":"additional","affiliation":[{"name":"Civil Engineering Research and Innovation for Sustainability Instituto Superior T\u00e9cnico  Lisbon Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9832-6433","authenticated-orcid":false,"given":"Jo\u00e3o C","family":"Bordado","sequence":"additional","affiliation":[{"name":"Centro de Recursos Naturais e Ambiente Instituto Superior T\u00e9cnico  Lisbon Portugal"}]}],"member":"311","published-online":{"date-parts":[[2022,8,29]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature21001"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.biomac.7b00840"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.aat9072"},{"key":"e_1_2_8_5_1","first-page":"583","volume-title":"Advances in Engineering Fluid Mechanics: Multiphase Reactor and Polymerization System Hydrodynamics","author":"Cheremisinoff N. 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