Supercritical fluid foaming of nanoscale phase patterned structures: An approach to lightweight hierarchical porous foams with superior thermal insulation

被引：0
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作者：
Zhang, Ruiyan [1 ]
Kim, Eric S. [1 ]
Romero-Diez, Sandra [1 ]
Wang, Yaxian [2 ]
Huang, Gang [2 ]
Li, Ke [2 ]
Yang, Yong [3 ]
Lee, Patrick C. [1 ]
机构：
[1] Multifunctional Composites Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto,Ontario,M5G3G8, Canada
[2] ExxonMobil Asia Pacific Research and Development Company, 1099 Zixing Road, Shanghai,200241, China
[3] ExxonMobil Fuels and Lubricants Company, 22777 Springwoods Village Parkway, Texas,77389, United States
来源：
Chemical Engineering Journal | 2022年 / 431卷
关键词：
Hierarchically porous (HP) design provides an effective alternative to develop lightweight thermal insulation (T-I) materials; which play an important role in efficient energy management. Unlike elaborate synthetic methods; achieving HP features via supercritical fluid (SCF) techniques is still at an early stage. In this study; a facile and effective approach is reported to develop tailored HP foams via SCF foaming of binary blends with nanoscale phase separation patterns. The resultant cyclic olefin copolymer (COC) blend foams are extremely lightweight (50 kg m−3) and have excellent thermal conductivity of 25.8 mW m-1K−1; which is on par with the thermal conductivity of air. Through the SCF foaming process; tunable HP structures can be created from COC blends with nanoscale phase patterns (phase size from ∼ 150 to 240 nm). Different from traditional T-I polystyrene foams; chemical resistant COC blend foams are good candidates for durable coatings; and a dual-mode thermal device was successfully assembled with active photothermal conversion functionality and passive T-I performance; which exhibited a temperature difference of 32 °C between the two surfaces under illumination (2.4 × 105 lx). This opens up a new perspective for the development of lightweight; chemically resistant and highly thermally insulating foams for thermal management applications. © 2021;
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