Aramid fiber coated with aramid nanofiber coating to improve its interfacial properties with polycarbonate

Abstract

This study addresses the effect of the coatings prepared from aramid nanofibers (ANFs) on the surface treatment of aramid fiber and reinforced polycarbonate (PC) composite (AF/PC). Aramid fiber's smooth, inert surface bonds poorly with polycarbonate. In this research, the PC‐ANF coating was made by the PC/CH2Cl2 solution, which was modified by aramid nanofibers to improve the interfacial adhesion and compatibility of aramid fiber/PC composites. What's more, the silane (KH570) was added to improve the dispersion and interfacial strength of ANF and PC. The results showed the water contact angle of the aramid fiber modified by PSi‐ANF coating was reduced, indicating the modified fiber has a better wettability. The interfacial bonding strength between PC and aramid fiber increased by 77.2%. The AF/PC composites were prepared by hot‐compression, which the aramid fiber wovens treated with P‐ANF coating, PSi‐ANF coating. The tensile strength, flexural strength, interlaminar shear strength, and impact strength of the AF/PC composite reinforced by AF treated with PSi‐ANF containing 2.0 wt% ANF increased by 62.0%, 81.9%, 49.5%, and 27.6%, respectively. Therefore, this study demonstrates that incorporating ANF interphase may offer an innovative and practical way for enhancing the interface bonding properties of aramid‐reinforced composites.

Synthesis and modification of poly (p‐phenylene terephthalamide) for production of light‐weight hybrid composite armors reinforced with polymer composite nanofiber mats

“…BPPTA compared to the neat PAN nanofiber mat, indicating a promising improvement in stiffness and then decreased with further BPPTA loading. The strong intermolecular interactions between the matrix and the additive polymer molecules result in improved mechanical and thermal properties due to the effective load transfer as well as the enhanced interfacial adhesion and connectivity of the resulting network 40,76,78 . However, after an optimal filling ratio, over‐fusion of the nanofibers may have negative effects on the tensile and flexural properties 85 .…”

“…The strong intermolecular interactions between the matrix and the additive polymer molecules result in improved mechanical and thermal properties due to the effective load transfer as well as the enhanced interfacial adhesion and connectivity of the resulting network. 40,76,78 However, after an optimal filling ratio, over-fusion of the nanofibers may have negative effects on the tensile and flexural properties. 85 While the increase in mechanical performance is expected to continue due to the decrease in average fiber diameter and increase in inter-chain interactions as the additive ratio increases, it is observed that the mechanical properties decrease with additive loading higher than an optimal filling ratio, which is 3%, 5%, and 1% for tensile strength, toughness, and elastic modulus, respectively.…”

“…[34][35][36][37][38] Research efforts are therefore underway to develop different designs to improve the energy absorption capacity of para-aramid fabrics through interply/intraply hybridization with different types of synthetic and natural fibers, layering of different materials or matrices and impregnation with STF, micro/nano-particles or the combination of these. [39][40][41] However, the contribution of polymer-based nanofiber mats to the ballistic impact response of the textile laminated armor system has not yet been reported in the open literature, despite the promising improvement in the mechanical properties of composites with a very small nanofiber reinforcement (<10 wt%) due to their extremely high surface area/mass ratio.…”

Thermal oxygen aging mechanism and assessment of aramid chopped fibers/polyphenylene sulfide composite paper

“…Para‐aramid fibers are high‐performance fibers composed of highly oriented and rigid poly(terephthaloyl‐p‐phenylenediamine) with strong hydrogen bonding which exhibits considerably high strength and modulus, acid and alkali resistance, durability, flame, and heat resistance 1–5 . Para‐aramid paper, which is normally prepared with aramid chopped fibers (ACFs) and fibrid or pulp fiber by wet papermaking and hot‐pressing, 6–8 is widely used in national defense, aerospace, electromechanical components, automotive parts, high‐temperature fume filtration, and other areas 9–15 .…”

Protect aramid materials from UV‐induced damage by ANF and ANF/light stabilizer composites

“…ANFs may also improve the interfacial properties of aramid materials. 21 With the help of ANF, ZnO nanoparticles can be better incorporated into aramid materials. The combination of ANF and nanomaterials could be achieved more easily, thanks to the nanoscale dimension and the higher number of active functional groups of ANF.…”