Improvement of interfacial shear strengths of polybenzobisoxazole fiber/epoxy resin composite by n‐TiO₂ coating

Abstract

Smooth polybenzobisoxazole (PBO) fiber has limited interfacial interaction with resin matrix. In this article, nano-TiO 2 coating on PBO fiber is applied to improve the interfacial adhesion between PBO fiber and epoxy resin. The test results suggest that the PBO fiber had good interaction with epoxy resin matrix after its treatment with n-TiO 2 sol. Nano TiO 2 particle embedded onto PBO fiber surface, acting as a chock, which made fiber implanted into the resin better. This greatly improved the shear strengths (IFSS) of PBO fiber/epoxy resin composite. It has been found that a 56% increase in interfacial IFSS has achieved without sacrificing mechanical properties of fiber.

A facile method to prepare multifunctional PBO fibers: simultaneously enhanced interfacial properties and UV resistance

“…As shown in Fig. 19 Aer further GO graing onto the ber surface, the IFSS has a remarkable increase from 52.6 to 61.3 MPa in comparison with that of PBO-SiO 2 , which is mainly attributed to the increased quantity of oxygen-containing polar functional groups and surface roughness, as mentioned above. Aer acid treatment, the TS has a small decrease to 5.51 GPa and the IFSS has a increase to 48 MPa.…”

“…Therefore, it is a challenge to improve the interfacial properties PBO ber composites, and various approaches have been reported for modifying the PBO ber surface. 19 Chemical graing based on different bridging agents is another effective method to improve the interfacial properties of ber reinforcement. [13][14][15][16][17] Inorganic coating (e.g.…”

High‐performance copoly(benzimidazole‐benzoxazole‐imide) fibers: Fabrication, structure, and properties

“…15,16 In addition, those polymers containing benzoxazole moieties, such as polybenzoxazoles (PBOs), usually display superior mechanical properties as well as excellent thermal stability and good environmental resistance. [17][18][19][20] Thus, the incorporation of benzimidazole or benzoxazoles moieties into the polyimide main chains is expected to improve the mechanical, thermal and adhesive properties by many researchers. 2,11,[21][22][23][24][25][26][27][28] In our previous article, 27 the homopolyimide (homo-PI) fibers containing benzimidazole and containing benzoxazole were prepared and the crystallization behavior of two fibers was studied.…”

Modifying the carbon fiber–epoxy matrix interphase with graphite nanoplatelets

“…With low interfacial mechanical properties, especially low interfacial adhesion, external stress applied on the composite part cannot be efficiently transferred from the matrix to the fibers, which diminishes the mechanical properties of the composite part, especially the off‐axis strength properties . One potential way of improving the interfacial mechanical properties and the performance of the associated composite is to incorporate nanoparticles, because of their mechanical properties and high aspect ratio . It has been reported that the properties of the interphase and mechanical can be enhanced by incorporating carbon nanotubes (CNTs).…”

“…It has been reported that the properties of the interphase and mechanical can be enhanced by incorporating carbon nanotubes (CNTs). This results in better mechanical properties as compared with other types of nanoparticles such as silica , or titanium dioxide nanoparticles . However, major drawbacks related to CNTs are high cost, contamination with catalysts and toxicity .…”