RT info:eu-repo/semantics/article T1 Improvement of the thermal conductivity of micronized nanocellular poly(methyl-methacrylate) (PMMA) by adding infrared blockers A1 Sánchez Calderon, Ismael A1 Lizalde Arroyo, Félix A1 Martín de León, Judith A1 Rodríguez Pérez, Miguel Ángel A1 Bernardo García, Victoria K1 Thermal conductivity K1 Poly(methyl-methacrylate) K1 Micronized nanocellular polymer K1 Infrared blockers K1 VIP K1 23 Química AB Micronized nanocellular polymers show great potential to be used as core materials for vacuum insulation panels due to their reduced thermal conductivity under vacuum. However, as a result of their nanocellular structure, these materials are characterized by thermal radiation contributions higher than 4 mW/(m·K). This work studies how to further enhance their thermal insulation behavior by adding infrared blockers to reduce thermal radiation. Three different opacifiers (titanium(IV) oxide, graphene nanoplatelets, and silicon carbide) are used in different contents (2.5, 5, 10, 15, and 20 wt%). The obtained powders are characterized to determine the apparent density, the particle size distribution, and the thermal conductivity. The addition of infrared blockers leads to an increase in apparent density which is also related to the opacifier’s particle size. For each infrared blocker, there is an optimum concentration to achieve the minimum thermal conductivity. Finally, compacted panels are produced to analyze their behavior as VIP cores by measuring thermal conductivity under vacuum conditions. A minimum thermal conductivity of 9.6 mW/(m·K) is obtained for the compacted panel containing 10 wt% of silicon carbide, a reduction of 2 mW/(m·K) regarding the sample without opacifier. PB Elsevier SN 0950-0618 YR 2025 FD 2025 LK https://uvadoc.uva.es/handle/10324/76995 UL https://uvadoc.uva.es/handle/10324/76995 LA eng NO Construction and Building Materials, 2025, vol. 489, p. 140522 NO Producción Científica DS UVaDOC RD 06-sep-2025