Modification of tensile, wear and interfacial properties of Kevlar fibers under cryogenic treatment

3D printing-directed auxetic Kevlar aerogel architectures with multiple functionalization options

“…Like most conventional materials, Kevlar bres or bulk materials have a positive Poisson's ratio. 50 On the other hand, auxetic materials with a negative Possion's ratio have been achieved through design and fabrication of specic internal structures, and the latest advancement of design and modelling also enabled the prediction and control of the polarity (negative or positive) and value of the Poisson's ratio of a newly designed material. [18][19][20] To explore the feasibility of controlling Poisson's ratio and understand the response of Kevlar aerogel-based auxectic materials in a scalable manner, ve types of porous architectures with predicted values of the Poisson's ratio from À0.8 to 0.4 over large tensile deformations 19,20,29 were designed and digitally fabricated by optimised 3D cryo-printing, and were validated against the numerically predicted behaviour ( Fig.…”

Semi-interpenetrating network composites reinforced with Kevlar fibers for dental post fabrication

“…Kevlar, on the hand, has extremely good mechanical properties, however, its use in endodontic fiber posts is very limited with one study by Kim et al 22) , where Kevlar, glass and UHMWP fibers were used to reinforce thermosetting resin matrices fabricating three kinds of experimental FRC posts. The flexural properties of Kevlar posts obtained were between glass and polyethylene, however, the high performance of the Kevlar fibers with respect to high tensile strength and modulus was not fully utilized because of the surface inertness 23) . Hu et al recently reported the feasibility of applying a high-performance fiber, poly p-phenylene-2,6-benzobisoxazole (PBO), in FRCs as a new option to develop posts with improved flexural strength using a combination of coupling agent and argon plasma methods to treat the fibers 24) .…”

Tensile and interfacial properties of dry-jet wet-spun and wet-spun polyacrylonitrile-based carbon fibers at cryogenic condition

“…Considerable attentions have been paid to CFRP to explore the mechanical property and failure mode at cryogenic temperatures or after cryogenic conditioning. [5][6][7] By investigating the properties of cryogenically conditioned CFRP, some scholars observed micro-cracked interface between fiber and polymer. The micro-cracking happened as a response to thermal residual stresses generated through cryogenic cycling, which resulted from large differences of the coefficient of thermal expansion between the carbon fiber and the matrix.…”