Facile fabrication of hierarchically structured PBO-Ni(OH)₂/NiOOH fibers for enhancing interfacial strength in PBO fiber/epoxy resin composites

详细信息    查看全文

• 作者：Lei Chen^a ; Yunzhe Du^b ; Yudong Huang^b ; Pui Fai Ng^a ; Bin Fei^a ; ^{tcfeib@polyu.edu.hk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Fibres ; Polymer-matrix composites (PMCs) ; Interphase ; Interfacial strength ; Electrical properties
• 刊名：Composites Science and Technology
• 出版年：2016
• 出版时间：6 June 2016
• 年：2016
• 卷：129
• 期：Complete
• 页码：86-92
• 全文大小：2071 K

文摘

A new hierarchical reinforcement was fabricated by depositing honeycomb-like Ni(OH)₂/NiOOH coating onto poly(p-phenylene benzobisoxazole) (PBO) fibers using a facile chemical bath deposition (CBD) method. The crystal structure of Ni(OH)₂/NiOOH deposited PBO fiber, denoted as PBO-Ni(OH)₂/NiOOH, was characterized by X-ray diffractometer (XRD). Scanning electron microscopy (SEM) was employed to characterize the surface morphologies of PBO fibers and the de-bonding surface morphologies of their composites. Atomic force microscopy (AFM) and contact angle (CA) testing results demonstrated that the surface roughness (R_a) and wettability of PBO fibers increased obviously after Ni(OH)₂/NiOOH deposition due to the unique honeycomb structure of the coating. Monofilament pull-out tests showed that the interfacial shear strength (IFSS) of PBO/epoxy composite increased by 46.3%. Moreover, the possible interfacial property enhancing reasons were explored. Thermogravimetric analysis (TGA) and hydrothermal aging tests revealed that PBO-Ni(OH)₂/NiOOH had excellent thermal stability and hydrothermal aging resistance. Notably, the Ni(OH)₂/NiOOH coating on the fiber surface can be easily reduced to Ni, resulting in a highly conductive PBO fiber. Our design starts from simple chemistry and inexpensive materials, and may offer a versatile and scalable method for fabricating hierarchical reinforcements.