纳米TiO_2/纤维复合材料的热辐射性能研究

Radiative thermal property of nano TiO_2/fiber composite

基于静电纺丝技术和逐层自组装技术制备得到了组装层数分别为0、2、4和6的纳米TiO_2/纤维复合材料。基于SEM和FT-IR等性能测试与理论计算方法,获得了纳米TiO_2/纤维复合材料的结构和热辐射性能。在结构方面,随着TiO_2组装层数的增多,纳米TiO_2/纤维复合材料的平均纤维直径增大,TiO_2在组装层中的百分比也增大;在热性能方面,纳米电纺纤维组装TiO_2(2层)后,红外光谱透过率和辐射热导率均显著减小;随着组装TiO_2层数的增多,纳米TiO_2/纤维复合材料的辐射热导率得到了进一步的减小,指出了这是由于纳米TiO_2颗粒表现出很强的散射和吸收消光的结果。

TiO_2/polyvinylidene fluoride（PVDF）composites with layers of 0,2,4and 6 were prepared based on electrospinning and self-assembled techniques.Their physical structure and radiative thermal properties were then obtained by SEM,FT-IR and theoretical calculation method.In surface structure,the average diameter and content of TiO_2 in assembled layer increased as the number of assembled layer increased.In radiative thermal properties,the infrared spectrum transmittances and radiative thermal conductivities of the second assembly obviously decreased comparing to those of the zeroth assembly.And the radiative thermal conductivities of composites could obtain further decreases with increasing assembled TiO_2 layer.The mechanism of thermal attenuation was analyzed aiming at the strongly scattering and absorption of nano TiO_2 particles.