应用化学2025，Vol.42Issue(2)：238-248,11.DOI:10.19894/j.issn.1000-0518.240319
聚脲气凝胶的制备及其对轻质复合砂浆的影响
Preparation of Polyurea Aerogels and the Effect on Lightweight Composite Mortar
摘要
Abstract
Polyurea(PUA)aerogels were prepared by the reaction of polyhexamethylene diisocyanate(PHDI)with 4,4'-diaminodiphenyl methane(MDA)and 4,4'-diaminodiphenyl ether(ODA),respectively.MDA-PUA aerogel has lower linear shrinkage and higher porosity,with a compression modulus of 11.4 MPa and a thermal conductivity of 0.020 W/(m·K).The initial decomposition temperature of MDA-PUA aerogel is 321℃,and the carbon residue rate is 19.3%.MDA-PUA aerogel is preferred to replace sand in equal volume to make composite mortar.When the volume fraction of aerogel is higher than 30%,the mortar can reach the lightweight standard,and the thermal conductivity can be reduced to 0.097 W/(m·K),94.2%lower than that of pure mortar.Aerogel enables lightweight mortar to have excellent thermal insulation performance.The flexural strength and compressive strength of mortar decrease with the increase of the amount of aerogel,but the 28 d compressive strength of lightweight mortar can still meet the requirements of CL5-CL40 grade of lightweight aggregate concrete.关键词
聚脲气凝胶/轻质砂浆/导热系数/抗压强度Key words
Polyurea aerogels/Lightweight mortar/Thermal conductivity/Compressive strength分类
化学化工引用本文复制引用
罗玉梅,周昀,周易,邵雅菲..聚脲气凝胶的制备及其对轻质复合砂浆的影响[J].应用化学,2025,42(2):238-248,11.基金项目
国家自然科学基金(No.52073239)和四川省玄武岩纤维复合材料开发及应用工程技术研究中心开放基金(No.2022SCXWYXWFC010)资助 Supported by the National Natural Science Foundation of China(No.52073239)and the Open Fund of Sichuan Basalt Fiber Composite Material Development and Application Engineering Technology Research Center(No.2022SCXWYXWFC010) （No.52073239）
