Effect of thermal aging on microstructures of aramid composites

Li, Changsheng; Huang, Xiaoguang; Li, Yan; Zhou, Hong; Shen, Zhihao; Fan, Xinghe

doi:10.1002/pc.23582

Cited by 8 publications

(3 citation statements)

References 41 publications

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“…Furthermore, composites can be used at various temperatures that may cause degradation in matrix material and fiber/matrix interface. 38 To the best of authors’ knowledge, despite a great deal of study presented on the quasi-static testing of thermoset composites reinforced with CFs and AFs, there is no study related to the investigation of hybrid TPCs especially at elevated temperatures. Hence, the aim of the current research is to quantitatively evaluate the influence of hybridization on the quasi-static perforation response of the TPCs as a function of temperature.…”

Section: Introductionmentioning

confidence: 99%

Quasi-static perforation response of inter-ply hybrid polypropylene composites at various temperatures

Öztoprak

Özdemir

Kandas

2021

Journal of Composite Materials

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This study is motivated by the lack of knowledge in the research of mechanical characterization of thermoplastic composites (TPCs) with additional fiber hybridization. To enhance the mechanical properties of long glass fiber-reinforced polypropylene (PP) composite, hybridization via alkaline-treated aramid and carbon fabrics is performed. High performance fabrics modified with 10 wt.% sodium hydroxide (NaOH) aqueous solution are incorporated into the PP composite as reinforcements. Herewith, four arrangements (hybrid composites) for two different reinforcements and two different stacking configurations and the monolithic composite are separately investigated in terms of quasi-static perforation behavior. Failure mechanisms are also evaluated at macro level by visual observations and micro scales through a scanning electron microscopy (SEM). The experimental results provide a basis for selecting fiber-enabled hybridization and lay-up configuration with improved perforation resistance. Moreover, the influence of test temperature is reported for three different values as 20°C, 60°C, and 100°C. Based upon the results, the maximum penetration force of hybrid configuration with single-layered aramid fabric reinforcements is approximately 15.5% higher than that of single-layered carbon fabric reinforcements at 60°C test temperature. It is further observed that the absorbed energy improves as the number of fabrics is increased in both aramid and carbon reinforcements. The test temperatures significantly affect the failure mechanisms of TPCs. A smaller damaged area at the penetrated faces of the hybrid structures is obtained by comparison with the monolithic TPCs.

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Section: Introductionmentioning

confidence: 99%

Quasi-static perforation response of inter-ply hybrid polypropylene composites at various temperatures

Öztoprak

Özdemir

Kandas

2021

Journal of Composite Materials

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“…Currently, the epoxy resin/glass fiber composite material made by blending, dipping, and so forth has been extensively applied in the fields of power electronics, automotive parts, turbine blades as well as pipeline transport. [8][9][10] For the application of high-voltage insulation such as dry-type air-core reactors, the glass fiber-reinforced epoxy resin composite materials are often selected to ensure their operational safety and reliability required. However, during the real-time operation of dry-type air-core reactors, their windings and wiring arms may inevitably generate heat, which results in gradually deteriorating the insulation of the materials over its lifespan and influencing the continuous secure operation of the power grid.…”

Section: Introductionmentioning

confidence: 99%

Thermal‐aging characteristics of epoxy/glass fiber composite materials fordry‐typeair‐core reactors

Bian

Xia

et al. 2021

Polymer Composites

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In recent years, dry-type air-core reactors have frequently experienced inter-turn short circuits due to the aging of the inter-turn insulation. In this paper, we prepared epoxy/glass fiber samples and carried out an accelerated thermal aging test up to 840 hours. In different stages of aging, we tested the surface insulation properties, dielectric properties, thermal and mechanical properties of the samples. The results show that: Flashover voltage drops significantly, and when aging for 35 days, it has dropped by 12.4%. This is because aging is accompanied by the conversion of shallow traps to deep traps and the reduction of conductive channels, which slows down the charge dissipation rate and decreases the flashover voltage. Dielectric, thermal, and mechanical properties also show a deteriorating trend. Through the analysis of the changes in thermal and mechanical properties, it is inferred that thermal aging will damage the epoxy matrix more than the glass fiber. In addition, combined with the scanning electron microscope, Fourier transform infrared spectrometer, and X-ray photoelectron spectrometer characterization results, we believed that the main reason for the material deterioration is the detachment of the glass fiber and the break of the long chain of the matrix. This article has certain reference value for the subsequent engineering application and online monitoring of this material.

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“…Although many composites have been prepared reported based on polyurethane and lignin with wide variety of materials, quite surprisingly, at least according to our knowledge, no attempt has been made to combine them with an ionomers. Na ionomers have been reported to be compatible with polyurethane materials and also maintain biodegradability at low concentrations …”

Section: Introductionmentioning

confidence: 99%

Flexible and compatible polymer composite blends based on polyurethane/sodium ionomer/lignin and their properties

Rukmanikrishnan

Kim

Lee

2020

J of Applied Polymer Sci

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Polyurethane, sodium ionomer (Surlyn 8150), and lignin (PSL)-based composite films were prepared by the solution casting method with different weight percentages of lignin. The relationships among the morphology, thermal resistance, mechanical, and dynamic mechanical properties for all composites were characterized. The structural interactions, microstructure, and optical properties of the composite were studied by Fourier transform infrared, scanning electron microscopy (SEM), X-ray diffraction, and ultraviolet (UV) spectroscopy. The mechanical and UV absorbance properties of the composite films improved significantly with the addition of lignin particles. The tensile strength increased from 42.5 to 57.2 MPa. Dynamic mechanical analysis results show that the storage modulus of the composites increased and exhibited a single T g . PSL composite films show excellent water barrier properties, with improved surface hydrophobicity. SEM images revealed that a relatively uniform phase morphology and good interfacial compatibilization wereachieved. These results suggest that all of the composite films with PU, Na ionomers, and lignin materials exhibited good compatibility and miscibility.

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Effect of thermal aging on microstructures of aramid composites

Cited by 8 publications

References 41 publications

Quasi-static perforation response of inter-ply hybrid polypropylene composites at various temperatures

Quasi-static perforation response of inter-ply hybrid polypropylene composites at various temperatures

Thermal‐aging characteristics of epoxy/glass fiber composite materials fordry‐typeair‐core reactors

Flexible and compatible polymer composite blends based on polyurethane/sodium ionomer/lignin and their properties

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