亚微米纤维多孔材料热辐射性能的实验与理论  

Experimental and Calculation of Radiative Thermal Characteristics of Submicron Fibrous Materials

作　　者：杨建明[1] 吴会军[1,2] 何石泉[2] 黄华锟 丁云飞[1] 

机构地区：[1]广州大学土木工程学院 [2]广州大学建筑节能研究院,广东广州510006

出　　处：《高分子材料科学与工程》2016年第6期160-165,共6页Polymer Materials Science & Engineering

基　　金：广东省自然科学杰出青年基金资助项目(S2013050014139)

摘　　要：采用静电纺丝技术制备出几种不同直径的亚微米纤维多孔材料（纤维直径分别为0.52μm,0.63μm和0.65μm）,通过傅里叶变换红外光谱测试了各材料的红外透过率;根据实验测试数据,基于Mie散射理论、Subtractive Kramers-Kronig（SKK）关系式和Beer定律,计算了亚微米纤维多孔材料的复折射率和辐射热导率,研究了纤维直径对材料衰减系数和辐射热导率的影响,并以最小辐射热导率为目标对纤维直径进行了优化。结果表明,在300K温度下,对于纤维体积分数为0.03的多孔材料,直径为2.0μm时辐射热导率最小（0.292 m W/（m·K））,较0.52～0.65μm（实验条件）的辐射热导率降低了约25%。Submicron fiber porous materials were prepared by electrospinning technique with different diameters of0. 52 μm,0. 63 μm and 0. 65 μm,and infrared transmittance of the materials was measured by FT-IR. Based on the measured data,Mie theory,Kramers-Kronig relations and Beer＇s law,the complex refractive index and radiative thermal conductivity of submicron fiber porous materials were calculated. The effect of fiber diameter on the extinction coefficient and radiative thermal conductivity of materials was investigated,and optimized the fiber diameter for minimizing the radiative thermal conductivity. The results indicate that the fiber diameter of 2. 0 μm has the minimum radiative thermal conductivity of 0. 292 m W /（ m·K） as the fiber volume fraction is 3% at 300 K. The radiative thermal conductivity of the materials is lower by 25% than that with experimental diameter of 0. 52 ～ 0. 65 μm.

关 键 词：亚微米纤维 多孔材料 复折射率 辐射热导率 优化计算 

分 类 号：TB383[一般工业技术—材料科学与工程]