Composite heat-insulating nanofiber membrane containing hollow titania microspheres with different mass fractions is prepared by coaxial electrospinning.The morphologies of the microspheres and fibers are observed by scanning electron microscopy(SEM)and transmission electron microscopy(TEM),and the reasons for the changes in microsphere diameter and fiber diameter are analyzed.The thermal insulation performance test results show that the microspheres obtained by adding 20％tetrabutyl titanate and 2 mL ammonia solution have the highest thermal insulation temperature difference,reaching 4.2 K;By adding 2％microspheres for coaxial electrospinning,the thermal resistance of the fiber membrane can reach 0.0725 m2·K/W.The mechanical performance test results show that as the content of hollow microspheres increases,the fracture elongation and fracture strength first increase and then decrease;When the addition amount is 2％,the maximum breaking strength is 7.51 MPa.
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