Facile Adjusting for Cells of Lightweight Isocyanate-based Polyimide Foam and Operable Combination between Different Distinctive Acoustic Foams for Higher Performance

• 作者: Xiao-He Ren Gao-Hui Sun Lei-Chao Wang Rong-Rong Chen Jun Wang Shi-Hui Han
• 来源期刊: 高分子科学（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: ARTICLES
• 页码范围: 237-248
• 页数: 12页
• 语种: 英文

摘要

New ambient sound absorption material,lightweight isocyanate-based polyimide foam(IBPIF),was fabricated by operable combi-nation between different distinctive acoustic IBPIF.Cellular structure of IBPIF was facilely and obviously adjusted by increased slurry temperature corresponding to change in distinctive acoustic properties.Moreover,density of all IBPIF kept at only 12-17 kg/m3.With increasing slurry temperature from 0 °C to 40 °C,cell size and window opening rate gradually increased from 553 pm to 791 pm and from 6.85％to 58.46％,respectively.In this study,IBPIF generated by slurries at 0 °C(marked as PIF-2)and 40 °C(marked as PIF-6)showed best and distinctive acoustic behavior in 315-800 Hz and 800-6300 Hz regions,respectively.After acoustic behavior study of combined IBPIF prepared by stitching combination between two distinctive acoustic IBPIFs,results showed that only when PIF-6 sheet used as sound receiving surface even though with thickness of only 10 mm could the combined IBPIF possess the best acoustic level in 800-6300 Hz region as PIF-6.Furtherly,acoustic be-havior in 315-800 Hz region could be significantly enhanced by increasing thickness of PIF-2 and could reach or close to the best acoustic level.