Micro/nano-porous polymeric material is considered a unique industrial material due to its extremely low thermal conductivity,low density,and high surface area.Therefore,it is necessary to establish an accurate thermal conductivity prediction model suiting their applicable conditions and provide a theoretical basis for expanding their applications.In this work,the development of the calculation model of equivalent thermal conductivity of micro/nano-porous polymeric materials in recent years is summarized.Firstly,it reviews the process of establishing the overall equivalent thermal conduc-tivity calculation model for micro/nanoporous polymers.Then,the predicted calculation models of thermal conductivity are introduced separately according to the conductive and radiative thermal conductivity models.In addition,the thermal conduction part is divided into the gaseous thermal conductivity model,solid thermal conductivity model and gas-solid coupling model.Finally,it is concluded that,compared with other porous materials,there are few studies on heat transfer of mi-cro/nanoporous polymers,especially on the particular heat transfer mechanisms such as scale effects at the micro/nanoscale.In particular,the following aspects of porous polymers still need to be further studied:micro scaled thermal radiation,heat transfer characteristics of particular morphologies at the nanoscales,heat transfer mechanism and impact factors of micro/nanoporous polymers.Such studies would provide a more accurate prediction of thermal conductivity and a broader application in energy conversion and storage systems.

Haiyan Yu;Haochun Zhang;Jinchuan Zhao;Jing Liu;Xinlin Xia;Xiaohu Wu

School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Microcellular Plastics Manufacturing Laboratory(MPML),Department of Mechanical&Industrial Engineering,University of Toronto,5 King's College Road,Toronto,M5S 3G8,Ontario,Canada;Cellular Polymer Science&Technology Laboratory,School of Materials Science&Engineering,Shandong University,Jinan 250061,China;Shandong Institute of Advanced Technology,Jinan 250100,China

物理学前沿

[1]Haiyan Yu;Haochun Zhang;Jinchuan Zhao;Jing Liu;Xinlin Xia;Xiaohu Wu-.Thermal conductivity of micro/nano-porous polymers:Prediction models and applications)[J].物理学前沿,2022(02):127-145

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