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Supporting Information Mechanically strong and thermally insulating polyimide aerogels by homogeneity reinforcement of electrospun nanofibers Xingyu Zhao a , Fan Yang a , Zicheng Wang b , Piming Ma b , Weifu Dong b , Haoqing Hou c , Wei Fan a,* , and Tianxi Liu a,b,* a State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Innovation Center for Textile Science and Technology, Donghua University, 2999 North Renmin S1
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Transcript of ars.els-cdn.com · Web viewStress-strain curve of NRPI-10 aerogel with a high strain (90%). Inset...

Supporting Information

Mechanically strong and thermally insulating polyimide aerogels by homogeneity reinforcement of electrospun nanofibers

Xingyu Zhao a, Fan Yang a, Zicheng Wang b, Piming Ma b, Weifu Dong b, Haoqing Hou c, Wei Fan a,*, and Tianxi Liu a,b,*

a State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Innovation Center for Textile Science and Technology, Donghua University, 2999 North Renmin Road, Shanghai 201620, China.

b Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.

c Department of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China.

* Corresponding Author.

E-mail: [email protected] or [email protected] (T. X. Liu), [email protected] (W. Fan)

Experimental details

Characterization

The morphologies of the short polyimide nanofibers and aerogels were observed by scanning electron microscope (SEM, HitachiS-8010, Japan). Thermogravimetric analysis (TGA) was performed on a NETZSCH TG 209 F1 Libra under air with a heating rate of 10 °C/min from 100 to 800 °C. The mechanical property test was performed on a universal testing machine (SANS UTM2102, China) equipped with a 100 N sensor at a compression rate of 40 mm min-1. Thermographic images were taken by an infrared thermal camera (TiS40, Fluke Co., Ltd, USA). The thermal conductivity was measured by a Hot Disk Thermal Constants Analyzer (Hot Disk TPS 2500S, Sweden) with a Kapton sensor (Hot Disk 5465). The applied measurement time and heating power were 10 s and 10 mW, respectively.

Figure captions

Fig. S1. SEM images of short polyimide nanofibers (A) before and (B) after dispersion.

Fig. S2. SEM images of (A) NRPI-5 and (B) NRPI-20.

Fig. S3. Stress-strain curve of NRPI-10 aerogel with a high strain (90%). Inset shows the digital photos of NRPI-10 before and after compression.

Fig. S4. SEM image of NRPI-20 with clear nanofiber agglomeration.

Fig. S5. Stress-strain curve of NRPI aerogels with different short polyimide nanofiber lengths.

Fig. S6. The relative modulus (defined as the measured Young’s modulus E divided by the Young’s modulus of the constituent solid Es) of NRPI aerogels with or without polyimide nanofibers.

Fig. S7. Compressive cycles of NRPI-10 aerogels at the strain of 25% for 100 cycles. Fig. S8. Finite element method (FEM) model of NRPI-0.

Fig. S9. Finite element method (FEM) model of NRPI-10.

Fig S10. Thermal conductivity of NRPI-0 and NRPI-10 aerogels in axial and radial directions.

Fig. S11. TGA curve of NRPI-10 under air atmosphere.

Fig. S1. SEM images of short polyimide nanofibers (A) before and (B) after dispersion.

Fig. S2. SEM images of (A) NRPI-5 and (B) NRPI-20.

Fig. S3. Stress-strain curve of NRPI-10 aerogel with a high strain (90%). Inset shows the digital photos of NRPI-10 before and after compression.

Fig. S4. SEM image of NRPI-20 with clear nanofiber agglomeration.

Fig. S5. Stress-strain curve of NRPI aerogels with different short polyimide nanofiber lengths.

Fig. S6. The relative modulus (defined as the measured Young’s modulus E divided by the Young’s modulus of the constituent solid Es) of NRPI aerogels with or without polyimide nanofibers.

Fig. S7. Compressive cycles of NRPI-10 aerogels at the strain of 25% for 100 cycles.

Fig. S8. Finite element method (FEM) model of NRPI-0.

Fig. S9. Finite element method (FEM) model of NRPI-10.

Fig S10. Thermal conductivity of NRPI-0 and NRPI-10 aerogels in axial and radial directions.

Fig. S11. TGA curve of NRPI-10 under air atmosphere.

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