scholarly journals One Surface Treatment, Multiple Possibilities: Broadening the Use-Potential of Para-Aramid Fibers with Mechanical Adhesion

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3114
Author(s):  
Sarianna Palola ◽  
Farzin Javanshour ◽  
Shadi Kolahgar Azari ◽  
Vasileios Koutsos ◽  
Essi Sarlin
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Matrix Material ◽  
Fiber Surface ◽  
Industrial Applications ◽  
Interfacial Shear ◽  
Full Potential ◽  
Aramid Fibers ◽  
Adhesion Properties ◽  
Mechanical Adhesion

Aramid fibers are high-strength and high-modulus technical fibers used in protective clothing, such as bulletproof vests and helmets, as well as in industrial applications, such as tires and brake pads. However, their full potential is not currently utilized due to adhesion problems to matrix materials. In this paper, we study how the introduction of mechanical adhesion between aramid fibers and matrix material the affects adhesion properties of the fiber in both thermoplastic and thermoset matrix. A microwave-induced surface modification method is used to create nanostructures to the fiber surface and a high throughput microbond method is used to determine changes in interfacial shear strength with an epoxy (EP) and a polypropylene (PP) matrix. Additionally, Fourier transform infrared spectroscopy, atomic force microscopy, and scanning electron microscopy were used to evaluate the surface morphology of the fibers and differences in failure mechanism at the fiber-matrix interface. We were able to increase interfacial shear strength (IFSS) by 82 and 358%, in EP and PP matrix, respectively, due to increased surface roughness and mechanical adhesion. Also, aging studies were conducted to confirm that no changes in the adhesion properties would occur over time.

scholarly journals Effect of Argon Plasma Pre-Treatment on adhesion of Epoxy to Aramid Fibers Treated with Oxygen Plasmas

1993 ◽  
Vol 2 (6) ◽  
pp. 096369359300200 ◽  
Author(s):  
A. Knickrehm ◽  
W. Rehm ◽  
P. Schwartz
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Argon Plasma ◽  
Interfacial Shear ◽  
Aramid Fibers ◽  
Argon Gas ◽  
Plasma Treatments ◽  
Oxygen Treatment ◽  
Pre Treatment

Microbond techniques are used to evaluate the interfacial shear strength ( IFSS) of epoxy on aramid fibers after plasma treatments. Argon gas plasmas are used to prepare the surface of the fibers for treatment using oxygen plasmas. Improvements in IFSS are shown to occur with both argon and oxygen treatment, and with the combination of oxygen and argon.

Study on 2-D Multi-Fiber Arrange Model Composites

2005 ◽  
Vol 297-300 ◽  
pp. 219-224
Author(s):  
Chang Kwon Moon ◽  
Ki Woo Nam
Keyword(s):  
Shear Strength ◽  
Surface Treatment ◽  
Interfacial Shear Strength ◽  
Fiber Surface ◽  
Interfacial Properties ◽  
Interfacial Shear ◽  
Two Dimensional ◽  
Fragmentation Test ◽  
Fiber Fragmentation ◽  
Fiber Surface Treatment

The effect of interfiber distance on the interfacial properties in two dimensional multi-Eglass fiber/epoxy resin composites has been investigated using fragmentation test. In additions, the effect of the fiber surface treatment on the interfacial properties has been studied. We found that the interfacial shear strength decreased with the decreasing of the interfiber distance at the range of under 50µm and the extent of the decreasing was more serious as the increasing of the number of adjacent fiber. This is probably that the interface between the fiber and the resin was damaged by the adjacent fiber breaks and the damage increased with closing the interfiber spacing and the number of adjacent fiber. We can guess from this interfacial shear strength in real composites is much smaller than that of multi-fiber fragmentation sample with touched fiber. It was seen that the interfacial shear strengths saturated when the interfiber distance was over 50µm, the ones were saturated regardless of fiber surface treatment and the ones were in close agreement with those of the single fiber fragmentation test. Finally, the interfacial shear strength evaluated using two dimensional fragmentation tests are shown as real values in-site regardless of fiber surface treatment, interfiber distance and existing of matrix cracks.

scholarly journals Lignin as a Functional Green Coating on Carbon Fiber Surface to Improve Interfacial Adhesion in Carbon Fiber Reinforced Polymers

Materials ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 159 ◽  
Author(s):  
László Szabó ◽  
Sari Imanishi ◽  
Fujie Tetsuo ◽  
Daisuke Hirose ◽  
Hisai Ueda ◽  
...  
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Interfacial Adhesion ◽  
Interfacial Shear Strength ◽  
Fiber Surface ◽  
Covalent Bond ◽  
Interfacial Shear ◽  
Fiber Reinforced ◽  
X Ray ◽  
Carbon Fiber Surface

While intensive efforts are made to prepare carbon fiber reinforced plastics from renewable sources, less emphasis is directed towards elaborating green approaches for carbon fiber surface modification to improve the interfacial adhesion in these composites. In this study, we covalently attach lignin, a renewable feedstock, to a graphitic surface for the first time. The covalent bond is established via aromatic anchoring groups with amine functions taking part in a nucleophilic displacement reaction with a tosylated lignin derivative. The successful grafting procedures were confirmed by cyclic voltammetry, X-ray photoelectron spectroscopy, and field emission scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. Both fragmentation and microdroplet tests were conducted to evaluate the interfacial shear strength of lignin coated carbon fiber samples embedded in a green cellulose propionate matrix and in a commercially used epoxy resin. The microdroplet test showed ~27% and ~65% increases in interfacial shear strength for the epoxy and cellulose propionate matrix, respectively. For the epoxy matrix covalent bond, it is expected to form with lignin, while for the cellulosic matrix hydrogen bond formation might take place; furthermore, plastisizing effects are also considered. Our study opens the gates for utilizing lignin coating to improve the shear tolerance of innovative composites.

scholarly journals Growing Nano-SiO2 on the Surface of Aramid Fibers Assisted by Supercritical CO2 to Enhance the Thermal Stability, Interfacial Shear Strength, and UV Resistance

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1397 ◽  
Author(s):  
Luwei Zhang ◽  
Haijuan Kong ◽  
Mengmeng Qiao ◽  
Xiaoma Ding ◽  
Muhuo Yu
Keyword(s):  
Thermal Stability ◽  
Shear Strength ◽  
Uv Radiation ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Uv Resistance ◽  
Aramid Fibers ◽  
Premature Failure ◽  
X Ray ◽  
Nano Sio2

Aramid fibers (AFs) with their high Young′s modulus and tenacity are easy to degrade seriously with ultraviolet (UV) radiation that leads to reduction in their performance, causing premature failure and limiting their outdoor end use. Herein, we report a method to synthesize nano-SiO2 on AFs surfaces in supercritical carbon dioxide (Sc-CO2) to simultaneously improve their UV resistance, thermal stability, and interfacial shear strength (IFSS). The effects of different pressures (10, 12, 14, 16 MPa) on the growth of nanoparticles were investigated. The untreated and modified fibers were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). It was found that the nano-SiO2-decorated fibers exhibited improvement of thermal stability and mechanical properties, and the IFSS of the nano-SiO2 modified fibers increases by up to 64% compared with the untreated fibers. After exposure to 216 h of UV radiation, the AFs-UV shows a less decrease in tensile strength, elongation to break and tensile modulus, retaining only 73%, 91%, and 85% of the pristine AFs, respectively, while those of AFs-SiO2-14MPa-UV retain 91.5%, 98%, and 95.5%. In short, this study presents a green method for growing nano-SiO2 on the surface of AFs by Sc-CO2 to enhance the thermal stability, IFSS, and UV resistance.

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