Toader Gabriela, Diacon Aurel, Rusen Edina, Rizea Florica, Teodorescu Mircea, Stanescu Paul O, Damian Celina, Rotariu Adrian, Trana Eugen, Bucur Florina, Ginghina Raluca
Faculty of Weapon Systems Engineering and Mechatronics, Military Technical Academy, 39-49 George Cosbuc Boulevard, 050141 Bucharest, Romania.
Department of Bioresources and Polymer Science, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania.
Polymers (Basel). 2021 May 17;13(10):1618. doi: 10.3390/polym13101618.
This study describes a simple, practical, inexpensive, improved, and efficient novel method for obtaining polyurea-polyurethane-multiwall carbon nanotubes (MWCNTs) nanocomposites with enhanced mechanical properties, and their experimental testing in a dynamic regime. SEM and micro-CT investigations validated the homogeneity of the nanocomposite films and uniform dispersion of the nanofiller inside the polymeric matrix. The experimental measurements (TGA, DSC, DMA, and tensile tests) revealed improved thermal and mechanical properties of these new materials. To demonstrate that these nanocomposites are suitable for ballistic protection, impact tests were performed on aluminum plates coated with the polyurea-polyurethane MWCNTs nanocomposites, using a Hopkinson bar set-up. The experimental testing in the dynamic regime of the polyurea- polyurethane-coated aluminum plates confirmed that the nanocomposite layers allow the metal plate to maintain its integrity at a maximum force value that is almost 200% higher than for the uncoated metallic specimens.
本研究描述了一种简单、实用、廉价、改进且高效的新颖方法，用于获得具有增强机械性能的聚脲 - 聚氨酯 - 多壁碳纳米管（MWCNTs）纳米复合材料，并对其进行动态条件下的实验测试。扫描电子显微镜（SEM）和微型计算机断层扫描（micro - CT）研究验证了纳米复合薄膜的均匀性以及纳米填料在聚合物基体中的均匀分散。实验测量（热重分析（TGA）、差示扫描量热法（DSC）、动态热机械分析（DMA）和拉伸试验）揭示了这些新材料具有改善的热性能和机械性能。为了证明这些纳米复合材料适用于防弹保护，使用霍普金森杆装置对涂有聚脲 - 聚氨酯MWCNTs纳米复合材料的铝板进行了冲击试验。对涂有聚脲 - 聚氨酯的铝板在动态条件下的实验测试证实，纳米复合层能使金属板在最大力值下保持其完整性，该最大力值比未涂覆的金属试样高出近200%。
