Du Jinze, Zeng Hongyan, Zhou Enguo, Feng Bo, Chen Chaorong, Xu Sheng, Hu Guo
College of Chemical Engineering, Xiangtan University, Hunan 411105, China.
J Nanosci Nanotechnol. 2019 Nov 1;19(11):7476-7486. doi: 10.1166/jnn.2019.16635.
The microcapsule nanoparticles were prepared by copolymerization of hydrotalcites (MAH) with the polymer (MF, PF, PS and PU) monomers, respectively, where the MF-wrapped MAH (MAH@MF) had the best monodispersity. The composites of the microcapsules and EVA were prepared by incorporating the microcapsule nanoparticles into ethylene vinyl acetate (EVA), respectively. To further understand the intrinsic correlation between microcapsule fillers and EVA matrix, molecular dynamics (MD) simulation was introduced to qualitatively analyze the contribution of microcapsule fillers on improving compatibility and mechanical properties of the EVA matrix. The compatibility of microcapsule nanoparticles with EVA matrix were detected in sequence through SEM, DSC and tensile strength tests. And the combustion, thermal behavior and flame retardance were also characterized by TG analyses as well as LOI and UL-94 level. As a result, the MAH@MF filler had the best performances in improving the flame retardancy and mechanical properties among the microcapsule fillers, attributed to high compatibility of the MAH@MF and EVA matrix, which made uniform distribution of the MAH@MF filler due to the reciprocity of triazine functional ring with vinyl acetate linkages.
通过水滑石（MAH）分别与聚合物（MF、PF、PS和PU）单体共聚制备微胶囊纳米粒子，其中MF包裹的MAH（MAH@MF）具有最佳的单分散性。通过将微胶囊纳米粒子分别加入乙烯 - 醋酸乙烯酯（EVA）中来制备微胶囊与EVA的复合材料。为了进一步了解微胶囊填料与EVA基体之间的内在相关性，引入分子动力学（MD）模拟来定性分析微胶囊填料对改善EVA基体相容性和力学性能的贡献。通过扫描电子显微镜（SEM）、差示扫描量热法（DSC）和拉伸强度测试依次检测微胶囊纳米粒子与EVA基体的相容性。并且还通过热重分析（TG）以及极限氧指数（LOI）和UL - 94等级来表征燃烧、热行为和阻燃性。结果，在微胶囊填料中，MAH@MF填料在提高阻燃性和力学性能方面具有最佳性能，这归因于MAH@MF与EVA基体的高相容性，由于三嗪官能环与醋酸乙烯酯键的相互作用，使得MAH@MF填料能够均匀分布。
