Tensile and interfacial properties of polyacrylonitrile-based carbon fiber after different cryogenic treated condition

Gao

Journal of Engineered Fibers and Fabrics

et al. 2019

Self Cite

For carbon fiber-reinforced polymer composites applied in aerospace industry, the mechanical performance of carbon fiber in extreme temperature environment is of great importance. In this study, carbon fiber produced by dry-jet wet spinning and wet spinning approaches were cryogenically conditioned at different cooling rates. After cryogenically conditioned at sharp cooling rate, both fibers have around 10% decreases in tensile strength due to the huge hoop stress induced by the quenching process. However, after cryogenically conditioned at slow cooling rate, the interfacial shear strength between the two kinds of carbon fibers and epoxy resin was significantly enhanced. Furthermore, scanning electron microscopy, atomic force microscopy, and the Raman spectroscopy were conducted to detect the microstructures and surface morphologies of the cryogenically conditioned carbon fibers. This study provided fundamental data for the material design and application of the carbon fiber at extreme temperature environments such as aerospace or other industrial fields.

Section: Introductionmentioning

confidence: 99%

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

Gao

Journal of Engineered Fibers and Fabrics

et al. 2019

Self Cite

“…[7,8] Composite cryotanks filled with cryogenic propellants (fueling/ refueling) are required to be resistant to dramatic temperature change as well as long cryogenic temperature exposure. [9][10] Cryogenic conditions considerably affect the stress transferring across the carbon fiber (CF)/resin interface. The mismatch between the expansion coefficients of CF (−1~1.5 × 10 −6 / C in the axial direction and 5~10 × 10 −6 / C in the radial direction) and resin (~50 × 10 −6 / C) lead to different deformation.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the cryogenic‐interfacial‐strength of carbon fiber composites by chemical grafting of graphene oxide/attapulgite on T300

Yan

Chu

et al. 2020

Polymer Composites

A mismatch between the expansion coefficients of carbon fiber (CF, T300) and resin causes thermal deterioration at the interface of composite cryotanks. This study presents an effective method to enhance the cryogenic interfacial properties of a T300/epoxy (EP) composite, in which graphene oxide (GO)/attapulgite (ATP) hierarchical structures are chemically grafted onto the surface of T300. GO and ATP were sequentially assembled on the T300 surface, which changed the morphology of T300 and optimized the interfacial wettability of T300/EP. Surface topography and chemical bonding of grafted T300 fibers (T300-GO-ATP) were evaluated by SEM and XPS, respectively. Considering the functioning conditions of composite cryotanks, three cryogenic interfacial testing conditions were designed for the T300-GO-ATP/EP composites: −196 C, cryogenic cycling (from RT to −196 C), and immersion in liquid nitrogen (LN 2). The interfacial shear strength (IFSS) of T300-GO-ATP/EP composite at −196 C was 88.3 MPa, 53.1% stronger than that of T300/EP (57.6 MPa). Likewise, the IFSS of T300-GO-ATP/EP composites was tested under cryogenic cycling/immersion in LN 2 , which increased remarkably comparing to those of T300/EP under the same conditions. Results shows that GO/ATP suppress interfacial cracking and enhances the interfacial bonding of T300/EP at cryogenic temperatures through chemical bonding and nanointerlocking.

“…Polyimide (PI) filaments as reinforcements for advanced composites have attracted considerable research attention for their favorable thermal stability, outstanding mechanical properties, excellent chemical and radiation resistance, and special dielectric properties [1,2,3,4,5]. For composites, good interfacial adhesion between fiber and matrix facilitates the load transfer efficiency and improves the strength and toughness of the composite materials [6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, to overcome the limitations of the poor adhesion of high-performance fibers, a variety of techniques have been used, such as the acid oxidation treatment, alkali solution treatment, gas-phase oxidation, heat treatment, polymerization treatment, cryogenic treatment, and plasma treatment [5,12,13,14,15,16,17,18,19]. Among these methods (see Table S1), plasma treatment only works on the uppermost layer of the material without compromising the bulk properties.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Polyimide Filaments and Composites Improved by O2 Plasma Treatment

Lin

Tang³

et al. 2018

Polymers

Abstract:Interface issues urgently need to be addressed in high-performance fiber reinforced composites. In this study, different periods of O 2 plasma treatment are proposed to modify twist-free polyimide (PI) filaments to improve hydrophilicity and mechanical and interfacial properties. Feeding O 2 produces chemically active particles to modify the filament surface via chemical reactions and physical etching. According to the X-ray photoelectron spectroscopy (XPS) results, the PI filaments exhibit an 87.16% increase in O/C atomic ratio and a 135.71% increase in the C-O functional group after 180 s O 2 plasma treatment. The atomic force microscope (AFM) results show that the root mean square roughness (Rq) of the treated PI filaments increases by 105.34%, from 38.41 to 78.87 nm. Owing to the increased surface oxygenic functional groups and roughness after O 2 plasma treatment, the contact angle between treated PI filaments and water reduces drastically from the pristine state of 105.08 • to 56.15 • . The O 2 plasma treated PI filaments also demonstrate better mechanical properties than the pristine PI filaments. Moreover, after O 2 plasma treatment, the adhesion between PI filaments and poly(amic acid) (PAA) is enhanced, and the tensile strength of the polyimide/poly(amic acid) (PI/PAA) self-reinforced composites increases from 136 to 234 MPa, even causing the failure mode of the composite changes from adhesive failure to partly cohesive failure.