| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Synthesis and Characterization of the APTES Cross-linked Polyimide Aerogels |
| FEI Zhifang1,2, LI Kunfeng1,2, YANG Zichun1,2, GAO Wenjie1,2, CHEN Guobing1,2
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1 Institute of High Temperature Structural Composite Materials of Naval Ship, Naval University of Engineering, Wuhan 430033;
2 School of Power Engineering, Naval University of Engineering, Wuhan 430033; |
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Abstract Taking the low-cost 3-aminopropyltriethoxysilane (APTES) as crosslinking agent,4,4′-oxydianiline (ODA) as diamine monomer,3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) or pyromellitic dianhydride (PMDA) as dianhydride monomer, cross-linked polyimide aerogels with different dianhydride monomers were successfully synthesized by sol-gel and chemical imidization methods combined with CO2 supercritical drying technique. Then, the chemical composition, micro topography, pore structure, compressibility and thermal stability of the samples were characterized by FTIR, SEM, N2 adsorption and desorption, universal material testing machine and thermogravimetric analysis. Furthermore, the effects of dianhydride monomers on the compressibility and thermal stability of polyimide aerogels were investigated. The results showed that the polyimide aerogels with two kinds of mo-nomers both presented nanoscale fibrous network structure with low density (0.102 g/cm3 and 0.121 g/cm3) and large specific surface area (295 m2/g and 311 m2/g). The cross-linked polyimide aerogels with PMDA as monomer possessed the compressive strength and compressive modulus of 0.37 MPa and 5.3 MPa, which were higher than that of the cross-linked polyimide aerogels with BPDA as monomer (0.17 MPa and 3.0 MPa). Besides, the initial thermal decomposition temperature of the former polyimide was 543 ℃, which was higher than the initial thermal decomposition temperature of the latter polyimide (502 ℃).
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Published: 22 November 2018
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2018, Vol. 32 
