采用静电纺丝技术,通过调节电压、供液速率和电场间距3个工艺参数,制备出的4组直径<1 μm的电纺PVDF亚微米纤维,实验表征和测试了纤维的微观形貌和热辐射性能.结果表明,4组纤维中平均直径的最小为449 nm,且直径分布较窄;在常温300 K温度下,当纤维直径从499 nm增大到774.8 nm时, PVDF纤维膜的辐射热导率从0.095×10-3W/(m·K)降低至0.037×10-3W/(m·K),研究结果可用于改善PVDF纤维膜的保温性能优化.%The radiative heat flux through fibrous insulations could be reduced by adjusting fibre diameters.In this paper, four kinds of lectrospun PVDF submicro fibre whose diameters were less than 1 μm were obtained by electrospinning technique.The microstructure and thermal radiation properties of electrospun microano fibers were investigated.The results showed that, the finest fibers of 449 nm could be obtained.The radiant thermal conductivity of PVDF fibers respectively decreased from 0.095×10-3 to 0.037×10-3 W/(m·K) at 300 K when the diameter increased from 499 to 774.8 nm.The results could be used to improve the shielding properties of the fiber material for thermal radiation.
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