Polyhedral Oligomeric Silsesquioxane Encountering Tannic Acid: A Mild and Efficient Strategy for Interface Modification on Carbon Fiber Composites

Abstract

Designing and controlling the interfacial chemistry and microstructure of the carbon fiber is an important step in the surface modification and preparation of high-performance composites. To address this issue, a tannic acid (TA)/polyhedral oligomeric silsesquioxane (POSS) hybrid microstructure, similar to the topological structure, is designed on the fiber surface by one-pot synthesis under mild conditions. Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) show that the functionality and surface roughness of the fiber are significantly broadened. Correspondingly, the tensile strength (TS) of CF-TA/POSS100 and interlaminar shear strength (ILSS) of CF-TA/POSS100-based composites increased by 18 and 34%, respectively. Following that, a failure mechanism study is conducted to demonstrate the interphase structure containing TA/POSS, which is quite critical in optimizing the mechanical performance of the multiscale composites. Moreover, the strategy for the use of TA for constructing a robust coating to replace the traditional modification without affecting the fiber intrinsic strength is an improved design and provides a new idea for the development of high-performance composites.

Targeted Elimination of Surface Defects in Carbon Fibers: Formation of a Hybrid Structure Combining Rigidity with Flexibility from Sonochemical-Induced Directional Growth of Nano-ZIF-8 and Subsequent Annealing

“…In order to further enhance the mechanical performance of carbon fibers, researchers have been attempting to eliminate surface defects on carbon fibers. 10,11 Numerous studies on the surface modification of carbon fibers 12,13 and a wide range of nanomaterials, such as carbon nanotubes, 14 silicon dioxide, 15 titanium dioxide, 16 and graphene, 17,18 have been conducted recently. Undoubtedly, these materials have contributed to the improvement of the practicality of carbon fibers.…”

“…Numerous studies on the surface modification of carbon fibers , and a wide range of nanomaterials, such as carbon nanotubes, silicon dioxide, titanium dioxide, and graphene, , have been conducted recently. Undoubtedly, these materials have contributed to the improvement of the practicality of carbon fibers.…”

Key Factors of Mechanical Strength and Toughness in Oriented Poly(l-lactic acid) Monofilaments for a Bioresorbable Self-Expanding Stent

“…As a biodegradable polymer, poly­( l -lactic acid) (PLLA) monofilaments can be prepared via melt extrusion and solid-state drawing, , which are increasingly applied to biomedical devices such as PLLA braided stents − and surgical sutures . Moreover, the high orientation, crystallinity, superior strength, and toughness of the monofilaments, as the fundamental element of the braided stents, are acquired. ,− Nowadays, researchers have made great progress in fabricating high-performance PLLA monofilaments especially for manufacturing technologies. − In particular, PLLA-based implants typically contact the bloodstream or other avascular tissues, which have to be sterilized to eliminate the risks of infection before clinical application. , The complex external and internal environments can also drastically influence the mechanical properties of the monofilament. Therefore, it is essential to understand and predict the changes in the mechanical strength and toughness of PLLA monofilaments in determining the shelf life of PLLA braided stents.…”

Improve the Interfacial Properties between Poly(arylene sulfide sulfone) and Carbon Fiber by Double Polymeric Grafted Layers Designed on a Carbon Fiber Surface

“…20−23 Nevertheless, there are several concerns in the above method, which was applied in the enhancement to the interface of CF/PASS composite, such as, carbon fiber will be corroded under strong acid conditions, destroying the original structure and causing the performance of carbon fiber itself to decline. 24 Therefore, in our research, a double polymeric grafted layer was constructed on carbon fiber with polydopamine (PDA) film and NH 2 −PASS molecular chains, respectively, which can act as a solid bridge to build a reliable interphase between carbon fiber and matrix by chemical and physical bonds. This perspective of double polymeric grafted layer provides advantages such as more efficiency, more environmental friendliness, low cost, as well as avoiding damage for inherent properties of carbon fiber (Figure S1 in the Supporting Information).…”

“…However, the interfacial interaction between CF and thermoplastic resin is indeed weak, which can be attributed to the lack of active groups in the thermoplastic chains as well as the extremely inert graphite structures on a carbon fiber surface, − making it very difficult to create effective physical and chemical bonding as well as outstanding interfacial properties. Similarly, the lack of reactive groups of molecular chains for a thermoplastic matrix always results in a big obstacle in the formation of chemical bonds with carbon fiber. , Consequently, in order to increase the interfacial interaction, improve the thermal and mechanical performance, and broaden the application field for the thermoplastic composite, some methods and equipment for modifying the interphase of composite have emerged as the times require, such as oxidation, γ-ray irradiation, electrochemical or grafting modification, , and some other nanoparticle modification. − Nevertheless, there are several concerns in the above method, which was applied in the enhancement to the interface of CF/PASS composite, such as, carbon fiber will be corroded under strong acid conditions, destroying the original structure and causing the performance of carbon fiber itself to decline . Therefore, in our research, a double polymeric grafted layer was constructed on carbon fiber with polydopamine (PDA) film and NH 2 –PASS molecular chains, respectively, which can act as a solid bridge to build a reliable interphase between carbon fiber and matrix by chemical and physical bonds.…”