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After systematically and quantitatively investigating thermal insulation behavior in PS\/EG foams, it was found that the inclusion of 1 wt% EG in 25-fold expanded PS\/EG foam blocks over 90% of the radiative thermal conductivity, with only a marginal increase in heat conduction. A great reduction in total thermal conductivity from 36.5 to 30.2 mW\u00b7m\u22121\u00b7K\u22121 was then achieved. By further optimization using a co-blowing agent in the supercritical CO2 foaming process, superthermal insulating PS\/EG foam with a total thermal conductivity of 19.6 mW\u00b7m\u22121\u00b7K\u22121 was achieved for the first time. This significant result implies that the composite material design together with the foaming process design is capable of obtaining a superthermal insulating composite foam by using the following strategy: using additives with high IR absorption efficiency, a foam with a large expansion ratio, and a co-blowing agent with low gas conductivity.<\/jats:p>","DOI":"10.3390\/polym17081040","type":"journal-article","created":{"date-parts":[[2025,4,11]],"date-time":"2025-04-11T10:05:51Z","timestamp":1744365951000},"page":"1040","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Thermal Insulation Foam of Polystyrene\/Expanded Graphite Composite with Reduced Radiation and Conduction"],"prefix":"10.3390","volume":"17","author":[{"given":"Pengjian","family":"Gong","sequence":"first","affiliation":[{"name":"Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King\u2019s College Road, Toronto, ON M5S 3G8, Canada"},{"name":"College of Polymer Science and Engineering, Sichuan University, 24 Yihuan Road, Nanyiduan, Chengdu 610065, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minh-Phuong","family":"Tran","sequence":"additional","affiliation":[{"name":"Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King\u2019s College Road, Toronto, ON M5S 3G8, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9287-1692","authenticated-orcid":false,"given":"Piyapong","family":"Buahom","sequence":"additional","affiliation":[{"name":"Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King\u2019s College Road, Toronto, ON M5S 3G8, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christophe","family":"Detrembleur","sequence":"additional","affiliation":[{"name":"Center of Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liege, All\u00e9e de la Chimie, B6a, Sart Tilman, 4000 Li\u00e8ge, Belgium"},{"name":"WEL Research Institute, 1300 Wavre, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jean-Michel","family":"Thomassin","sequence":"additional","affiliation":[{"name":"Center of Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liege, All\u00e9e de la Chimie, B6a, Sart Tilman, 4000 Li\u00e8ge, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1547-9125","authenticated-orcid":false,"given":"Samuel","family":"Kenig","sequence":"additional","affiliation":[{"name":"Department of Polymers and Plastics Engineering, Shenkar College, Anne Frank Street 12, Ramat Gan 52526, Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Quanbing","family":"Wang","sequence":"additional","affiliation":[{"name":"Jiangxi Tongyi Polymer Material Technology Co., Ltd., Jiangxi Tongyi New Material Industrial Park, Xinfeng County, Ganzhou City 341600, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1702-1268","authenticated-orcid":false,"given":"Chul B.","family":"Park","sequence":"additional","affiliation":[{"name":"Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King\u2019s College Road, Toronto, ON M5S 3G8, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"856","DOI":"10.1007\/BF03218626","article-title":"Effects of nucleating agents on the morphological, mechanical and thermal insulating properties of rigid polyurethane foams","volume":"17","author":"Kang","year":"2009","journal-title":"Macromol. 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