{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Zhao X"],"funding":["Shandong Provincial Natural Science Foundation"],"pagination":["387"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC12899982"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["18(3)"],"pubmed_abstract":["To meet the requirements of next-generation spacecraft thermal protection systems for lightweight materials with high strength, effective thermal insulation, and superior ablation resistance, a novel POSS-modified phenolic aerogel/quartz fiber composite (POSS-PR/QF) was developed using a thiol-ene click reaction combined with a sol-gel process. Covalent incorporation of polyhedral oligomeric silsesquioxanes (POSS) into the phenolic matrix effectively eliminates nanoparticle aggregation and improves interfacial compatibility. As a result, the modified resin is suitable for resin transfer molding (RTM) processes. The resulting composite exhibited an aerogel-like porous structure with enhanced crosslinking density, thermal stability, and oxidation resistance. At 7.5 wt% POSS loading, the composite achieved low density (~0.7 g·cm<sup>-3</sup>) and outstanding mechanical properties, with tensile, flexural, compressive, and interlaminar shear strengths increased by 114%, 79%, 29%, and 104%, respectively. Its thermal conductivity (0.0619 W/(m·K)) and ablation rates were also markedly reduced. Mechanistic studies revealed that POSS undergoes in situ ceramification to form SiO<sub>2</sub> and SiC phases, which create a dense protective barrier. In addition, this ceramification process promotes char graphitization, thereby enhancing oxidation resistance and thermal insulation. This work provides a promising approach for designing lightweight, high-performance, and multifunctional thermal protection materials for aerospace applications."],"journal":["Polymers"],"pubmed_title":["Preparation of Phenolic Aerogel/Quartz Fiber Composites Modified with POSS: Low Density, High Strength and Thermal Insulation."],"pmcid":["PMC12899982"],"funding_grant_id":["ZR2024QE229"],"pubmed_authors":["Ren X","Liu J","Liu Z","Fan X","Feng J","Li D","Yu Q","Shao M","Yu G","Yuan W","Zhao X","Kong G"],"additional_accession":[]},"is_claimable":false,"name":"Preparation of Phenolic Aerogel/Quartz Fiber Composites Modified with POSS: Low Density, High Strength and Thermal Insulation.","description":"To meet the requirements of next-generation spacecraft thermal protection systems for lightweight materials with high strength, effective thermal insulation, and superior ablation resistance, a novel POSS-modified phenolic aerogel/quartz fiber composite (POSS-PR/QF) was developed using a thiol-ene click reaction combined with a sol-gel process. Covalent incorporation of polyhedral oligomeric silsesquioxanes (POSS) into the phenolic matrix effectively eliminates nanoparticle aggregation and improves interfacial compatibility. As a result, the modified resin is suitable for resin transfer molding (RTM) processes. The resulting composite exhibited an aerogel-like porous structure with enhanced crosslinking density, thermal stability, and oxidation resistance. At 7.5 wt% POSS loading, the composite achieved low density (~0.7 g·cm<sup>-3</sup>) and outstanding mechanical properties, with tensile, flexural, compressive, and interlaminar shear strengths increased by 114%, 79%, 29%, and 104%, respectively. Its thermal conductivity (0.0619 W/(m·K)) and ablation rates were also markedly reduced. Mechanistic studies revealed that POSS undergoes in situ ceramification to form SiO<sub>2</sub> and SiC phases, which create a dense protective barrier. In addition, this ceramification process promotes char graphitization, thereby enhancing oxidation resistance and thermal insulation. This work provides a promising approach for designing lightweight, high-performance, and multifunctional thermal protection materials for aerospace applications.","dates":{"release":"2026-01-01T00:00:00Z","publication":"2026 Jan","modification":"2026-07-07T03:16:20.921Z","creation":"2026-07-07T03:08:46.444Z"},"accession":"S-EPMC12899982","cross_references":{"pubmed":["41682094"],"doi":["10.3390/polym18030387"]}}