School of Physics and Technology and Center for Electron Microscopy, Wuhan University, Wuhan 430072, China.
ACS Appl Mater Interfaces. 2011 Feb;3(2):534-8. doi: 10.1021/am101114t. Epub 2011 Feb 3.
Interface enhancement with carbon nanotubes (CNTs) provides a promising approach for improving shock strength and toughness of glass fiber reinforced plastic (GFRP) composites. The effects of incorporating flame-synthesized CNTs (F-CNTs) into GFRP were studied, including on hand lay-up preparation, microstructural characterization, mechanical properties, fracture morphologies, and theoretical calculation. The experimental results showed that: (1) the impact strength of the GFRP modified by F-CNTs increased by more than 15% over that of the GFRP modified by CNTs from chemical vapor deposition; and (2) with the F-CNT enhancement, no interfacial debonding was observed at the interface between the fiber and resin matrix on the GFRP fracture surface, which indicated strong adhesive strength between them. The theoretical calculation revealed that the intrinsic characteristics of the F-CNTs, including lower crystallinity with a large number of defects and chemical functional groups on the surface, promoted their surface activity and dispersibility at the interface, which improved the interfacial bond strength of GFRP.
界面增强用碳纳米管（CNTs）为提高玻璃纤维增强塑料（GFRP）复合材料的冲击强度和韧性提供了一种很有前途的方法。研究了将火焰合成的 CNT（F-CNTs）加入 GFRP 中的效果，包括手糊制备、微观结构表征、力学性能、断裂形态和理论计算。实验结果表明：（1）用 F-CNTs 改性的 GFRP 的冲击强度比用化学气相沉积法改性的 CNT 的 GFRP 提高了 15%以上；（2）随着 F-CNT 的增强，在 GFRP 断裂表面的纤维和树脂基体之间的界面上没有观察到界面脱粘，这表明它们之间具有很强的粘结强度。理论计算表明，F-CNTs 的内在特性，包括低结晶度、表面存在大量缺陷和化学官能团，促进了其在界面处的表面活性和分散性，从而提高了 GFRP 的界面结合强度。
