Wrong expectation of superinsulation behavior from largely-expanded nanocellular foams.
作者： Piyapong Buahom , Chongda Wang , Mohammed Alshrah , Guilong Wang , Pengjian Gong
DOI: 10.1039/D0NR01927E
关键词:
摘要: This work aims to predict the thermal conductivity of microcellular and nanocellular insulation foams explore correlation between cellular structure insulating properties. Closed-cell foam consisting cell walls struts was used as base geometry for modeling. The mathematical correlations calculate thickness diameter a given size, void fraction volume polymer located in were investigated. Then, model conductive including dependency on fraction, strut Knudsen effect gas introduced. radiative determined by analyzing attenuation energy absorption scattering based Mie's theory together with electromagnetic wave interference, well interference propagating waves tunneling evanescent cells. validated experimental data polystyrene (PS) poly(methyl methacrylate) (PMMA) at various sizes expansion ratios. It found that plays crucial role foam. trade-off size wall when become thinner highly transparent radiation demonstrated, leading optimal ratio which conductivities minimized. Perspectives manufacture high-performance are also discussed.
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