Preparation and Properties of Flexible Cross-linked Polyimide Aerogels

doi:10.7503/cjcu20180393

Abstract

Abstract:

Polyimide aerogels were synthesized by sol-gel reaction, followed by supercritical drying. The effects of sol solid content and cross-linking agent ratio on performance of polyimide aerogels were investigated. The results showed that both the shrinkage and density of polyimide aerogels increased with increasing sol solid content and cross-linking agent ratio. With the increased sol solid content, the suitable thermal conductivity(0.026—0.033 W·m^-1·K^-1) declined at first and then increased, and the modulus and strength of polyimide aerogels was improved obviously. Introducing the cross-linking agent into molecular structure improved the toughness of polyimide aerogels, and the maximum value of break strain was 21.7%. The polyimide aerogels also showed high temperature stability. The good properties made them an ideal insulation for light weight and flexible thermal protection of advanced weapons and space vehicles.

Key words: Flexible cross-linked polyimide aerogel, High temperature stability, Mechanical property, Insulation property

CLC Number:

O631
O648.1

TrendMD:

LIU Tao,LI Wenjing,ZHANG Enshuang,ZHONG Jinyang,ZHANG Fan,LIU Yuanyuan,ZHAO Yingmin. Preparation and Properties of Flexible Cross-linked Polyimide Aerogels[J]. Chem. J. Chinese Universities, 2019, 40(2): 403.

Figures/Tables 11

Scheme 1 Procedure of flexibility polyimide aerogel preparation

Fig.1 Density(A) and shrinkage(B) of polyimide aerogels prepared from different solid contents for PI-0(a), PI-1(b) and PI-2(c)

Fig.2 FTIR spectra of PI-0(a), PI-1(b) and PI-2(c)

Fig.3 SEM images of PI-1 with 7%(A), 5%(B) and 3%(C) solid contents

Fig.4 Nitrogen sorption isotherms(A) and BJH pore size distribution(B) of polyimide aerogels(PI-1) prepared with different solid contents

Fig.5 TGA curves of polyimide aerogels

Fig.6 Thermal conductivity of polyimide aerogels with different density

Fig.7 Solid content-tensile modulus relationship(A), tensile strength(B) and strain relationship(C) of PI-0(a), PI-1(b) and PI-2(c)

Table 1 Mechanical properties of polyimide aerogels

Sample	Solid content(%)	Theoretical density/ (g·cm^-3)	Average density/ (g·cm^-3)	Tensile modulus/ MPa	Tensile strength/ MPa	Strain(%)	Compressive modulus/ MPa	Compressive strength/ MPa
PI-0	7	0.067	0.080	22.70	1.09	6.6	7.26	0.39
	5	0.047	0.066	9.09	0.53	6.7	1.82	0.21
	3	0.027	0.033	3.46	0.32	10.3	0.51	0.04
PI-1	7	0.067	0.110	44.30	3.38	16.5	8.05	0.70
	5	0.047	0.061	11.00	0.81	12.1	2.53	0.27
	3	0.027	0.035	4.01	0.40	10.9	0.95	0.06
PI-2	7	0.067	0.170	148.00	8.28	21.7	32.52	2.02
	5	0.047	0.107	34.40	2.63	20.7	8.84	0.68
	3	0.027	0.044	5.23	0.60	14.4	0.40	0.06

Fig.8 Photograph of flexibility polyimide aerogels

Fig.9 Solid content-compressive modulus(A) and compressive strength relationship(B) of PI-0(a), PI-1(b) and PI-2(c)

References 27

[1]	Shen D.X., Fang G. Q., Liu J. G., Yang S. Y., Proceedings of the 10th Annual Academic Conference of the Committee on Deep Space Exporation of Chinese Society of Astronautics, Taiyuan, 2013, 142-147
	(沈登雄, 房光强, 刘金刚, 杨士勇. 中国宇航学会深空探测技术专业委员会第十届学术年会论文集, 太原, 2013, 142-147)
[2]	Randall J. P., Meador M. A. B., Jana S. C., ACS Appl. Mater. Interfaces,2011, 3(3), 613-626
[3]	Chen L. W., Gan L. H., Yue T. Y., Li G. M., Wang J., Shen J., Chem. J. Chinese Universities,1995, 16(6), 840-843
	(陈龙武, 甘礼华, 岳天仪, 李光明, 王珏, 沈军. 高等学校化学学报, 1995, 16(6), 840-843)
[4]	Gan L. H., Li G. M., Zhu D. Z., Yue T. Y., Chen L. W., Chem. J. Chinese Universities,2000, 21(6), 955-957
	(甘礼华, 李光明, 朱大章, 岳天仪, 陈龙武. 高等学校化学学报, 2000, 21(6), 955-957)
[5]	Kong X. L., Lu Y., Ye G. C., Li D. H., Sun J., Yang D. J., Yin Y. F., Chem. J. Chinese Universities,2017, 38(11), 1941-1946
	(孔雪琳, 卢芸, 叶贵超, 李道浩, 孙瑾, 杨东江, 殷亚方. 高等学校化学学报, 2017, 38(11), 1941-1946)
[6]	Jones S. M., J. Sol-Gel. Technol., 2006, 40(2/3), 351-357
[7]	Meador M. A. B., Malow E. J., Silva R., Wright S., Quade D., Vivod S. L., Guo H. Q., Guo J., Cakmak M., ACS Appl. Mater. Interfaces,2012, 4(2), 536-544
[8]	Guo H. Q., Meador M. A. B., McCorkle L., Quade D. J., Guo J., Hamilton B., Cakmak M., Sprowl G., ACS Appl. Mater. Interfaces,2011, 3(2), 546-552
[9]	Guo H. Q., Meador M. A. B., McCorkle L., Quade D. J., Guo J., Hamilton B., Cakmak M., ACS Appl. Mater. Interfaces,2012, 4(10), 5422-5429
[10]	Leventis N., Sotiriou-Leventis C., Mohite D. P., Larimore Z. J., Mang J. T., Churu G., Lu H. B., Chem. Mater.,2011, 23(8), 2250-2261
[11]	Meador M. A. B., Wright S., Sandberg A., Nguyen B. N., Keuls F. W. V., Mueller C. H., Rodriguez-Solis R., Miranda F. A., ACS Appl. Mater. Interfaces,2012, 4(11), 6346-6353
[12]	Meador M. A. B., Aleman C. R., Hanson K., Ramirez N., Vivod S. L., Wilmoth N., Mccorkle L., ACS Appl. Mater. Interfaces,2015, 7(2), 1240-1249
[13]	Pei X. L., Zhai W. T., Zheng W. G., Langmuir,2014, 30(44), 13375-13383
[14]	Wu W., Wang K., Zhan M. S., Ind. Eng. Chem. Res., 2012, 51(39), 12821-12826
[15]	Fang G. Q., Shen D. X., Li F. P., Li H., Yang H. X., Liu J. G., Yang S. Y., J. Mater. Engin.,2015, 43(12), 17-23
	(房光强, 沈登雄, 栗付平, 李华, 杨海霞, 刘金刚, 杨士勇. 材料工程, 2015, 43(12), 17-23)
[16]	Ning T., Yang G., Zhao W., Liu X., Reactive & Functional Polymers,2017, 116, 17-23
[17]	Chen Y., Shao G., Kong Y., Shen X., Cui S., Chem. Engin. J.,2017, 322, 1-9
[18]	Rhine W., Wang J., Begag R., Polyimide Aerogels, Carbon Aerogels, and Metal Carbide Aerogels and Methods of Making Same, US 7074880B2,2006-07-11
[19]	Chidambareswarapatter C., Larimore Z., Sotiriou-Leventis C., Mang J. T., Leventis N. J., Mater. Chem.,2010, 20, 9666-9678
[20]	Wu T., Dong J., Gan F., Fang Y., Zhao X., Zhang Q., Applied Surface Science,2018, 440, 595-605
[21]	Xie T., He Y. L., Hu Z. J., Intern. J. Heat and Mass Transfer,2013, 58(1), 540-552
[22]	Zeng S. Q., Hunt A., Greif R., J. Heat Transfer,1995, 117, 1055-1058
[23]	Nilsson O., Rüschenphler G., Cross J., Fricke J., High Temp. High Press., 1989, 21, 267-274
[24]	Rudaz C., Courson R., Bonnet L., Calas-Etienne S., Sallée H., Budtova T., Biomacromolecules,2014, 15(6), 2188-2195
[25]	Hsu C. T., Cheng P., Wong K. W., Transactions of the ASME,1995, 117, 264-269
[26]	Wei G. S., Liu Y. S., Zhang X. X., Yu F., Du X. Z., Intern. J. Heat and Mass Transfer,2011, 54(11/12), 2355-2366
[27]	Zhao J. J., Duan Y. Y., Wang X. D., Wang B. X., J. Nanoparticle Res.,2012, 14(8), 1024-1038