Xu Kangming, Hu Qiaoman, Wu Hong, Guo Shaoyun, Zhang Fengshun
College of Materials Science and Engineering, Chongqing University of Arts and Sciences, Yongchuan, Chongqing 402160, China.
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.
Polymers (Basel). 2020 Feb 14;12(2):446. doi: 10.3390/polym12020446.
Though hindered phenol/polymer-based hybrid damping materials, with an excellent loss factor, attract more and more attention, the significantly decreased mechanical property and the narrow damping temperature range limit the application of such promising materials. To solve the problems, a polyurethane (hindered phenol)/polyvinyl acetate multilayer system with varied layer numbers was prepared in this study. The multilayer microstructures were first verified through the scanning electron microscopy. A subsequent molecular dynamics simulation revealed the promoted diffusion of polyurethane (hindered phenol) and polyvinyl acetate layers, the compact chain packing of the polyurethane (hindered phenol) layer, the extended chain packing of the polyvinyl acetate layer, the intermolecular hydrogen bonds among the three components and the enhanced interface interactions between the two layers in a quantitative manner. Further the mechanical and dynamic mechanical analysis detected the successful preparation of the multilayer hybrids with simultaneously improved mechanical and damping properties. Then, by a combination of molecular dynamics simulation and experiment, the relationship between the structure evolution and the properties of the multilayer hybrids was established, which was expected to have some guiding significance for industrial production.
尽管具有优异损耗因子的受阻酚/聚合物基杂化阻尼材料越来越受到关注，但其显著降低的力学性能和狭窄的阻尼温度范围限制了这类有前景材料的应用。为了解决这些问题，本研究制备了具有不同层数的聚氨酯（受阻酚）/聚醋酸乙烯酯多层体系。首先通过扫描电子显微镜验证了多层微观结构。随后的分子动力学模拟定量揭示了聚氨酯（受阻酚）层和聚醋酸乙烯酯层之间促进的扩散、聚氨酯（受阻酚）层紧密的链堆积、聚醋酸乙烯酯层伸展的链堆积、三种组分之间的分子间氢键以及两层之间增强的界面相互作用。此外，力学和动态力学分析检测到成功制备了同时具有改善的力学和阻尼性能的多层杂化材料。然后，通过分子动力学模拟与实验相结合，建立了多层杂化材料的结构演变与性能之间的关系，这有望对工业生产具有一定的指导意义。
