一二三四区视频,亚洲少妇熟女色,日本久热无码视频网,欧美国产日韩大尺度,亚洲a视频,久久少妇一区二区,日韩999无码视频,刺激久久久久久久,啊啊啊啊不要啊在线

ChemicalBook >> journal list >> Chemical Engineering Journal >>article
Chemical Engineering Journal

Chemical Engineering Journal

IF: 13.3
Download PDF

Superior broadband sound absorption in hydrophobicity and mechanical enhancing Poly (urethane-imide)/Melamine aerogels via ambient drying

Published:9 December 2024 DOI: 10.1016/j.cej.2024.158391
Enyuan Hu, Yingwen Zhu, Haiyun Li, Cheng Deng, Bo Cui, Lei Zhao, Jinhui Wu, Xinmiao Wang, Mengfu Zhu

Abstract

Noise pollution has been recognized as having negative impacts on human psychological and physiological health. Common porous sound-absorbing materials are often limited by low sound absorption coefficient (SAC), excessive thickness, and poor moisture resistance or mechanical properties. Herein, poly(urethane-imide) and melamine foam (MF) were successfully combined for the first time using hydrothermal synthesis and ambient drying to fabricate a poly(urethane-imide)/melamine (PUI/MA) aerogel with a multi-stage pore structure and a core–shell framework. The introduction of PUI reduces pore size and increases tortuosity, thereby enhancing thermal and viscous losses of sound waves. Compared to unmodified MF, the noise reduction coefficient of PUI/MA aerogel achieves an 80?% improvement. Furthermore, numerical microstructural modeling calculations show that the JCA model’s predictions are more consistent with the SACs of PUI/MA aerogels. In addition to significantly improving SAC, the core–shell structure endows the composite aerogels with a compressive Young’s modulus up to 30 times that of MF, a water contact angle over 120°, and a thermal conductivity of less than 60?mW/m/K at 150?°C. The facile and cost-effective fabrication process, superior broadband sound absorption, and excellent fundamental properties suggest that PUI/MA aerogel is a promising candidate for noise mitigation in residential, rail transport, and industrial applications.

Substances (1)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Hexane 110-54-3 C6H14 887 suppliers $20.00-$29350.00

Similar articles

IF:10.7

Reinforced enzyme mineralized chitosan hydrogels with superior mechanical and osteogenic properties

Carbohydrate Polymers Yao Wang, Nihui Zhang,etc Published: 19 November 2024
IF:5.4

A Poly(ethylene oxide)/Lithium bis(trifluoromethanesulfonyl)imide-Coated Polypropylene Membrane for a High-Loading Lithium-Sulfur Battery.

ACS Applied Energy Materials Li-Ling Chiu, Sheng-Heng Chung,etc Published: 11 February 2021
莎车县| 甘孜县| 会同县| 铅山县| 霍邱县| 龙泉市| 黎川县| 林芝县| 平乡县| 鹤峰县| 微博| 微博| 江山市| 吴忠市| 安达市| 闽清县| 黄冈市| 英德市| 浦北县| 兴义市| 淳化县| 当雄县| 无为县| 呼伦贝尔市| 繁昌县| 遂平县| 定陶县| 金寨县| 太和县| 桓仁| 德州市| 锡林浩特市| 阜阳市| 鄂托克旗| 绥中县| 新河县| 林芝县| 连云港市| 临沭县| 广西| 康马县|