Surface modification of PBO fibers with random copolymer containing benzoxazole for improving surface activity, and enhancing interfacial bonding strength with cyanate ester resins
Lin Tang, Qingyi Hu, Xinyi Pan, Yu Lei, Lizhi Li, Yuanlin Wang, Wencai Zhou, Jupen Liu, Jiani Zhang, Xi Liu
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引用次数: 0
Abstract
Poly(p-phenylene-2,6-benzobisoxazole) (PBO) fibers present excellent comprehensive properties, attracting considerable attention and favor from researchers. However, the surface chemical inertia of PBO fibers limits their application in advanced composites. In this work, random copolymers (P(S-co-BCB-co-prePBO)) containing benzoxazole precursor in side chains are synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization, which are then utilized to form a polymer coating on PBO fibers by thermally cross-linking and thermal cyclization processes (PBO@PM fibers). Due to the strong π-π interactions between the random copolymer and PBO fibers, the surface roughness and surface activity of PBO@PM fibers are significantly improved, and the crystal structure are not damaged before and after modification. The surface roughness is increased from 10 nm (PBO fibers) to 68 nm, while the surface activity is increased from 39.2 mN∙m−1 (PBO fibers) to 53.7 mN∙m−1. Meanwhile, PBO@PM fibers present excellent interfacial bonding strength with bisphenol A cyanate (BADCy) resins. The single fiber pull-out strength of PBO@PM fibers/BADCy microdroplet composite is 5.1 MPa, 70% higher than that of PBO fibers/BADCy microdroplet composite. In general, the modification method effectively improves the surface activity of PBO fibers, further expanding their applications in the industrial sector.
期刊介绍:
Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field.
The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest.
Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials.
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