Journal
POLYMERS
Volume 13, Issue 24, Pages -Publisher
MDPI
DOI: 10.3390/polym13244434
Keywords
polyimide foam; rigid closed-cell foam; high temperature; benzimidazole
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Funding
- National Natural Science Foundation of China [51803222]
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Closed-cell rigid polyimide foams with excellent thermal stability and combined properties were prepared by thermal foaming of a reactive end-capped polyimide precursor powder in a closed mold, showing outstanding thermal stability and compression creep deformation resistance.
Closed-cell rigid polyimide foams with excellent thermal stability and combined properties were prepared by thermal foaming of a reactive end-capped polyimide precursor powder in a closed mold. The precursor powder was obtained by thermal treatment of a polyester-amine salt (PEAS) solution derived from the reaction of the diethyl ester of 2,3,3 ',4 '-biphenyl tetracarboxylic dianhydride (alpha-BPDE) with an aromatic diamine mixture of p-phenylenediamine (PDA) and 2-(4-aminophenyl)-5-aminobenzimidazole (BIA) in the presence of an end-capping agent (mono-ethyl ester of nadic acid anhydride, NE) in an aliphatic alcohol. The effect of polymer mainchain structures on the foaming processability and combined properties of the closed-cell rigid polyimide foams were systematically investigated. The polyimide foams (100-300 kg/m(3)) with closed-cell rates of 91-95% show an outstanding thermal stability with an initial thermal decomposition temperature of >= 490 degrees C and a glass transition temperature of 395 degrees C. Polyimide foams with density of 250 kg/m(3) exhibited compression creep deformation as low as 1.6% after thermal aging at 320 degrees C/0.4 MPa for 2 h.
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