具有混合多孔结构和隔热性能的轻质超高分子量聚乙烯薄膜的制备,Journal of Applied Polymer Science

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具有混合多孔结构和隔热性能的轻质超高分子量聚乙烯薄膜的制备
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-03-24 , DOI: 10.1002/app.52403
Yulian Shen ₁ , Zhiyu Liu ₁ , Genjie Jiang ₂ , Chunhai Li ₁ , Yuhang Guo ₁ , Rong Chen ₁ , Shaoyun Guo ₁

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根据红外隐身机制，控制物体表面温度可以有效隐藏红外辐射，抵抗红外探测。本文选用高红外透明聚合物超高分子量聚乙烯（UHMWPE）作为保温材料的基体。通过热致相分离结合颗粒浸出法获得了具有高孔隙率和混合孔结构的超高分子量聚乙烯多孔薄膜。通过改变UHMWPE/液体石蜡的质量比、NaCl的用量和粒径来调整具有微孔和大孔的薄膜结构。UHMWPE薄膜的热导率低至0.034 W/(m·K)，而密度仅为54.4 mg/cm ³. 经典的 Maxwell-Eucken 模型用于讨论薄膜的孔隙结构与热导率之间的关系。确定混合多孔结构可以同时降低热传导和气固耦合效应，从而显着降低热导率。此外，多孔薄膜表现出显着的柔韧性和疏水性。基于这些特性，多孔薄膜在隔热保护和红外隐身领域具有很大的应用前景。

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Fabrication of light-weight ultrahigh molecular weight polyethylene films with hybrid porous structure and the thermal insulation properties

According to the infrared stealth mechanism, controlling the surface temperature of objects can effectively hide the infrared radiation and resist the infrared detection. In this paper, a high infrared transparent polymer ultrahigh molecular weight polyethylene (UHMWPE) is selected as the matrix of a thermal insulation material. UHMWPE porous films with high porosity and hybrid pore structure are obtained through the thermal induced phase separation combining with particle leaching method. The film structures with micropores and macropores are adjusted through the variation of the mass ratio of UHMWPE/liquid paraffin, the dosage and the particle size of NaCl. The thermal conductivity of the UHMWPE film is as low as 0.034 W/(m K), while the density is only 54.4 mg/cm³. The classical Maxwell-Eucken model is used to discuss the relationship between the pore structure and the thermal conductivity of the films. It is determined that the hybrid porous structure can reduce heat conduction and gas–solid coupling effect simultaneously, thus the thermal conductivity is significantly reduced. Moreover, the porous films exhibited remarkable flexibility and hydrophobicity. Based on these properties, the porous films are highly promising in the field of thermal insulation protection and infrared stealth.

更新日期：2022-03-24

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