An electrocalic solution was prepared by mixing an amic acid (PAA) solution with nano-silicon nitride (Si3N4).A silicon nitride/polyamic acid (Si3N4/PAA) composite nanofiber membrane was prepared by electrospinning technique.The Si3N4/PAA was subjected to high temperature imidization to obtain a silicon nitride/polyimide (Si3N4/PI) composite nanofiber membrane by applying PAA solution with the uniform thickness on the Si3N4/PI.At high temperature imidization,the polyimide (PI) film with low coefficient of thermal expansion was repared.The appearance,PAA optimal imidization temperature and the thermal expansion coefficient of Si3N4/PI nanofibers were studied by scanning electron microscopy (SEM),infrared absorption spectroscopy(FT-IR),thermomechanical analysis (TMA),and dynamic thermomechanical analysis (DMA).The results of scanning electron microscopy showed that the Si3N4/PAA prepared had uniform fiber diameter.The infrared absorption peak of the imidized PI film at different temperatures indicated that the PAA was more imidized at 300°C.The TMA analysis shown that the thermal expansion coefficient of Si3N4/PI self-reinforced film was 45.4%～56.5% times lower than that of pure PI film.Dynamic thermomechanical analysis shown that the storage modulus of Si3N4/PI was 1.36～1.78 times high than that of pure PI film.
Shi Hong, Sun Zhiteng, Liu Xueqing
. Preparation and characterization of Si3N4/PI nanofiber self-reinforced film with low thermal expansion coefficient[J]. New Chemical Materials, 2022
, 50(3)
: 100
-103
.
DOI: 10.19817/j.cnki.issn1006-3536.2022.03.020
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