文献类型：期刊文献

英文题名：Direct Imaging of the Organic-Inorganic Interfacial Transformation

作者：Hong, Tianjiao[1];Tian, Pengfei[1];Xuan, Fuzhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China

年份：2025

卷号：25

期号：11

起止页码：4408

外文期刊名：NANO LETTERS

收录：;EI(收录号：20251118041718);WOS:【SCI-EXPANDED(收录号:WOS:001441186200001)】；

基金：This work was financially supported by the Basic Research Program of Science and Technology Commission of Shanghai Municipality (22JC1400600), the National Natural Science Foundation of China (22178110 and 52321002), and the Shanghai Rising-Star Program (23QA1402400).

语种：英文

外文关键词：polymer composites; organic-inorganic interfaces; in situ characterizations; cryogenictransmission electron microscopy; interfacial nanostructures

摘要：The organic-inorganic interfacial nanostructures between fillers and the matrix play a crucial role in the performance of polymer composites. Here we propose an in situ cryogenic transmission electron microscope technique (cryo-TEM) approach to directly observe the organic-inorganic interfacial transformation in a toluene diisocyanate (TDI)-based polyurethane composite during its synthesis process. Elliptical protrusions growing radially outward from the filler surface, which serve as the critical intermediate nanostructures of the interface layer, are observed by in situ cryo-TEM, indicating that the interface layer is formed through a curing reaction of the prepolymer molecules anchored on the filler surface. Both decreasing filler sizes and adding coupling agents can enhance the interfacial interactions. The addition of 0.05 wt % coupling agent increases the interface thickness from 83.93 to 129.31 nm and improves the fracture toughness of the composite by 75.1%. These findings provide new insights for rationally designing interfacial nanostructures and high-performance polymer composites.