期刊
RSC ADVANCES
卷 4, 期 102, 页码 58252-58259出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra08846h
关键词
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资金
- National Natural Science Foundation of China [51102184, 51172163, 51302040]
- National Key Technology Research and Development Program of China [2013BAJ01B01]
- National High Technology Research and Development Program of China [2013AA031801]
- Science and Technology Innovation Fund of Shanghai Aerospace, China [SAST201254, SAST201321]
- Shanghai Municipal Science and Technology Commission Nano Special Project, China [12nm0503001, 11nm0501600]
Polyimide cross-linked silica gels with different weight percentages of solid precursors and different volumes of MTMS were prepared by using bis(trimethoxysilylpropyl) amine (BTMSPA) cross-linked polyamide acid, synthesized by 4,4'-oxydianiline (ODA), p-phenylenediamine (PPDA) and biphenyl-3,3',4,4'- tetracarboxylic dianhydride (BPDA), compounding with a silica network which was hydrolysed by MTMS, then supercritically dried to produce a hybrid aerogel. The obtained aerogels exhibit striking properties such as low density (as low as 90 mg cm(-3)), a large surface area (up to 582 m(2) g(-1)), lower shrinkage (up to 20%) and are more easily accessible than those previous reported. Formulations made of 8.7% and 11.72% solid precursors never collapsed under compression. Furthermore, the latter shows the maximum modulus (up to 17 MPa) and a higher sound absorption coefficient (more than 0.8) with a thickness of 3 cm in a specific range of frequencies.
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