Two-stage interface enhancement of aramid fiber composites: Establishment of hierarchical interphase with waterborne polyurethane sizing and oxazolidone-containing epoxy matrix

Lin, Jiawei; Wang, Lili; Liu, Limin; Lu, Kangyi; Li, Gang; Yang, Xiaoping

doi:10.1016/j.compscitech.2020.108114

Cited by 43 publications

(21 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The deformation and modulus variation at the interphase in the CF/EP composite were characterized by force modulation AFM in the scanning region of 6 μm × 6 μm at a scanning rate of 1 Hz. The actual spring constant of the AFM tip (RTESPA-525, Bruker) was corrected to 350 N/m using the aforementioned thermal-tuning method, and the thickness, deformation, and modulus of the interphase were obtained by analyzing the force-separation curves from each tapping of probe via the NanoScopeAnalysis software. ,, Four points of each sample were probed to obtain the average thickness of the interphase. Sapphire was used as the standard material for the calibration of characterization under force modulation AFM.…”

Section: Methodsmentioning

confidence: 99%

“…The stiffened modulus intermediate layer formed by TAPc would increase the cross-linking density of the interphase and shield crack propagation from touching the fiber surface, whereas the constrained plastic deformation of the interphase limited the release of thermal residual stresses during curing and the efficiency of crack blunting. − On the other hand, the flexible interphase formed using a ductile polymeric material would act as macromolecular coupling agents between the fiber and matrix, − which improves the potential energy-absorbing capacity but reduces the adhesion force between the CF and resin matrix . In view of the design of the interfacial structure with both high stiffness and suitable toughness, − the rigid-and-flexible interphase with rigid/soft structures was proposed as a prospective strategy, among which the rigid component served as the robust shielding layer to deflect the crack path and the soft component acted as a stress-relief medium by inducing viscoplastic energy dissipation. − …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Constructing a Rigid-and-Flexible Twin-Stage Gradient Interphase through Starlike Copolymer Coating on Carbon Fibers: A Route for Enhancing Interfacial Properties of Composites

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

A rigid-and-flexible interphase was established by a starlike copolymer (Pc-PGMA/Pc) consisting of one tetraaminophthalocyanine (TAPc) core with four TAPc-difunctionalized poly(glycidyl methacrylate) (PGMA) arms through the surface modification of carbon fibers (CFs) and compared with various interphases constructed by TAPc and TAPc-connected PGMA (Pc-PGMA). The increase in the content of N–CO showed that PGMA/Pc branches were successfully attached onto the CF-(Pc-PGMA/Pc) surface, exhibiting concavo-convex microstructures with the highest roughness. Through adhesive force spectroscopy by atomic force microscopy (AFM) with peak force quantitative nanomechanical mapping (PF-QNM) mode and visualization of the relative distribution of TAPc/PGMA via a Raman spectrometer, a rigid interphase with highly cross-linked TAPc and a flexible layer from PGMA arms as the soft segment were separately detected in CF-TAPc/EP and CF-(Pc-PGMA)/EP composites. The rigid-and-flexible interphase in the CF-(Pc-PGMA/Pc)/EP composite provided excellent stress-transfer capability by the rigid inner modulus intermediate layer and energy absorption efficiency from the flexible outer layer, which contributed to 64.6 and 61.8% increment of transverse fiber bundle test (TFBT) strength, and 33.8 and 40.6% enhancement in interfacial shear strength (IFSS) in comparison with those of CF-TAPc/EP and CF-(Pc-PGMA)/EP composites. Accordingly, schematic models of the interphase reinforcing mechanism were proposed. The interfacial failures in CF-TAPc/EP and CF-(Pc-PGMA)/EP composites were derived from the rigid interphase without effective relaxation of interfacial stress and soft interphase with excessive fiber–matrix interface slippage, respectively. The cohesive failure in the CF-(Pc-PGMA/Pc)/EP composite was attributed to the crack deflection through the balance of the modulus and deformability from the twin-stage gradient intermediate layer.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Constructing a Rigid-and-Flexible Twin-Stage Gradient Interphase through Starlike Copolymer Coating on Carbon Fibers: A Route for Enhancing Interfacial Properties of Composites

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…The subsequent inferior interfacial bonding quality seriously affects the overall mechanical performance of composite materials of AFs. [5][6][7][8][9] As the most commonly used matrix material for engineering composites, epoxy resins are a class of reactive polymers that contain epoxide groups, crosslinked into three-dimensional networks via a chemical reaction. 10 They exhibit excellent chemical stability, high mechanical properties, strong adhesion, and low shrinkage during cure.…”

Section: Introductionmentioning

confidence: 99%

Secondary silane grafting on aramid fibers improves the interfacial bonding performance in textile composite materials

Cui

Xing

et al. 2022

Journal of Composite Materials

View full text Add to dashboard Cite

To improve the chemical and physical surface features of aramid fibers and the bonding quality at the interface, carbon nanotubes, dopamine and silane coupling reagent KH560 were used to modify the surface of aramid fibers. The fiber surface was characterized by FTIR, XPS, SEM and AFM. The single-fiber specific strength, surface roughness, wettability and interfacial shear strength of the modified fiber were quantified. Finally, the uniaxial tensile behaviour of the textile composite laminate with the modified fibers was tested. The experimental results show that: after the grafting of silane coupling reagent as a second modification step, the amount of oxygen-containing groups on the surface of aramid fibers, and the surface roughness, and the ability to impregnate resin are further improved. The single-fiber specific strength, the interfacial shear strength by fiber pull-out tests, and the tensile strength of the laminate are increased by 21.62%, 73.57%, and 51.60%, respectively. This work demonstrates a general surface modification strategy working for diverse types of fibers, synthetic or natural. The present findings help to develop a broad range of high-performance textile composites to address long-term challenges in structural engineering.

show abstract

“…However, its undesirable brittleness and a low crack resistance limit the overall performance of epoxy composites. 26 Thus, many studies have focused on the modification of epoxy resin, such as adding nanoparticles, 27,28 chain extension reaction, 29 and establishing an interpenetrating polymer network, for example, Refs. 30,31.…”

Section: Introductionmentioning

confidence: 99%

High‐performance fiber‐reinforced composites with a polydopamine/epoxy silane hydrolysis‐condensate bilayer on surface of ultra‐high molecular weight polyethylene fiber

Zhang

Cao

Zhou

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

A bilayer structure with polydopamine (PDA) transition layer and 3-glycidyl ether oxy-propyl trimethoxy silane (GOPTS) hydrolysiscondensate strengthened layer on the surface of ultra-high molecular weight polyethylene (UHMWPE) fiber is prepared to improve the damage resistance of composites and more efficient stress transmission in composites. PDA is covered on the surface of UHMWPE fiber and then GOPTS is hydrolyzed and condensed to form inorganic -O-Si-O-with epoxy groups on the PDA layer. In addition, the surface activated nano-SiO 2 is dispersed in the epoxy resin to increase the strength of the matrix resin. The results show that the interfacial shear strength (IFSS), the impact strength, the flexural strength and flexural modulus of UHMWPE-PDA-GOPTS/EP-SiO 2 increase by 99.1%, 54.1%, 76.8%, and 36.6% respectively compared with unmodified UHMWPE/EP. The chemical compositions of the treated fiber surface are characterized by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy (ATR-FTIR). With the help of the scanning electron microscopy, the interface failure and reinforcement mechanism of the composites are further explored due to UHMWPE fiber shear yield deformation, UHMWPE fiber fracture, matrix resin cracking and the relative sliding friction between the fiber and matrix.

show abstract

Two-stage interface enhancement of aramid fiber composites: Establishment of hierarchical interphase with waterborne polyurethane sizing and oxazolidone-containing epoxy matrix

Cited by 43 publications

References 42 publications

Constructing a Rigid-and-Flexible Twin-Stage Gradient Interphase through Starlike Copolymer Coating on Carbon Fibers: A Route for Enhancing Interfacial Properties of Composites

Constructing a Rigid-and-Flexible Twin-Stage Gradient Interphase through Starlike Copolymer Coating on Carbon Fibers: A Route for Enhancing Interfacial Properties of Composites

Secondary silane grafting on aramid fibers improves the interfacial bonding performance in textile composite materials

High‐performance fiber‐reinforced composites with a polydopamine/epoxy silane hydrolysis‐condensate bilayer on surface of ultra‐high molecular weight polyethylene fiber

Contact Info

Product

Resources

About