Journal
POLYMER
Volume 261, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2022.125397
Keywords
Thermal conductivity; poly(methyl-methacrylate); Nanocellular powder
Categories
Funding
- Junta of Castile and Leon grant [VA202P20]
- Spanish Ministry of Science, Innovation, and Universities [RTI2018-098749-B-I00, PTQ2019-010560, PRE2019-088820]
- European Regional Development Fund of the European Union
- European Regional Development Fund of Castile and Leon [(ICE): R&D PROJECTS IN SMEs: PAVIPEX. 04/18/VA/008, M-ERA. NET PROJECT: FICACEL. 11/20/VA/0001]
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Micronization is a promising route to reduce the thermal conductivity of nanocellular polymers by replacing the continuous solid phase with a discontinuous one, resulting in improved performance.
This work shows a route to reduce the thermal conductivity of nanocellular poly(methyl-methacrylate) (PMMA). This approach is based on micronizing to replace the continuous solid phase by a discontinuous one. PMMA powders with densities of 147-195 kg/m3, formed by particles of 100 mu m with nanometric cells inside them, are produced by milling. Micronization allows increasing the overall porosity maintaining the cell size. Results prove that after milling it is possible to obtain open cell nanoporous PMMA powders with thermal conductivity below that of the bulk materials (15% reduction). The reduction is not only due to a density decrease, but a result of the new structure of the powder material. The discontinuity of the solid phase and the increase in radiation extinction are the key factors allowing this improvement. This route is confirmed as a promising alternative to enhance the performance of nanocellular polymers.
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