期刊
ADVANCED ENGINEERING MATERIALS
卷 24, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.202101158
关键词
aramid honeycomb core; free foaming; isocyanate-based polyimide foam; sound absorption; water
资金
- Fundamental Research Funds for the Central Universities [3072021CF1016]
- Natural Science Foundation of Heilongjiang Province [LH2019E038]
- Heilongjiang Provincial Postdoctoral Science Foundation [LBH-Z19137]
By filling aramid honeycomb core with isocyanate-based polyimide foam with excellent thermal insulation and acoustic properties, the cellular structure was optimized to enhance acoustic performance, leading to a significant improvement in sound absorption and thermal insulation. The study identified an optimal formula to produce the best combination, achieving higher sound absorption coefficient and reduced thermal conductivity.
To endue sound absorption behavior for aramid honeycomb core (ARHC), isocyanate-based polyimide foam (IBPIF) with excellent thermal insulation and acoustic properties produced by a new formulation of foaming slurry is filled into ARHC by the free foaming route. As a core factor to adjust the cellular structure of IBPIF, the effect of water dosage on the acoustic behavior of IBPIF and IBPIF filled ARHC (IBPIF/ARHC) is studied, and the optimal formula to produce IBPIF/ARHC is filtered out. Results suggest that water dosage effectively regulates the cellular structure of IBPIF. When water dosage is 7.2 g, IBPIF has a large windows opening rate, which plays a positive role in sound absorption performance. IBPIF/ARHC-3 has the best sound absorption property, which possesses a maximum sound absorption coefficient (alpha) of 0.9 at 1500 Hz. Its average alpha increases to 0.78 and shows an increase of 680% compared to ARHC. Meanwhile, the density of IBPIF/ARHC is only about 59 kg m(-3). In 300-600 Hz range, IBPIF-3 and ARHC show obvious synergy effects in sound absorption behavior. The average alpha of IBPIF-3 and ARHC is only 0.3 and 0.06, respectively, and that of IBPIF/ARHC-3 reaches up to 0.42. The thermal insulation performance of ARHC is also improved, and thermal conductivity decreases from 0.067 to 0.047-0.049 W (m K)(-1).
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