Thermal–oxidative degradation and accelerated aging behavior of polyamide 6/epoxy resin‐modified montmorillonite nanocomposites

Xia, Lei; Xiong, Jinsu; Shentu, Baoqing; Wang, Zhixue

doi:10.1002/app.40825

Cited by 13 publications

(7 citation statements)

References 45 publications

(71 reference statements)

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“…652 Feldman EP/MMT prepared through solid state reaction was melt-processed with PA6. PA6/2 wt% EP-MMT and PA6 4 wt% EP-MMT showed similar thermal-oxidative aging stability, since higher content of EP-MMT caused worse dispersion and more decomposed organic surfactant thus weakened the stabilization effect (73).…”

Section: Thermoplastic-thermoset Polymer Blend Nanocompositesmentioning

confidence: 98%

Polyblend Nanocomposites

Feldman¹

2015

Journal of Macromolecular Science, Part A

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Blending polymers is used to obtain products with improved and wider range of properties. A polymer blend or polyblend is a microscopically mixture of two or more polymers. This paper deals with polyblend nanocomposites where one of the components has at least one dimension of the order of nanometer. It covers different groups of nanocomposites depending on the type of the polymer used in such mixtures, mainly:thermoplastic -thermoplastic polymer blend nanocomposites, thermoplastic -thermoset polymer blend nanocomposites, thermoplastic -elastomer polymer blend nanocomposites, biodegradable polymer blend nanocomposites.

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Section: Thermoplastic-thermoset Polymer Blend Nanocompositesmentioning

confidence: 98%

Polyblend Nanocomposites

Feldman¹

2015

Journal of Macromolecular Science, Part A

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“…In summary, in the process of thermal aging, it will be accompanied by the breaking of chemical bonds, the decomposition of macromolecules, the generation of free radicals, and the detachment of glass fibers, which together lead to the deterioration of the material. [24,25] Compared with the destruction of the glass fiber structure, the breakage of the long chain of the matrix, the change of the group content, and the decrease of the adhesion between the glass fiber and the matrix are the main reasons for the deterioration of the material.…”

Section: Characterization Of Compositesmentioning

confidence: 99%

“…At the same time, the presence of electric dipoles will increase the conductance loss, resulting in increased dielectric loss. [24,40] The increase in dielectric loss is equivalent to adding a heat source to the dry-type air-core reactor, which is detrimental to safe operation.…”

Section: Dielectric Propertiesmentioning

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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“…For example, a small amount of epoxy resin added to the GF‐PA6 composites could improve the bonding strength between GF and PA6, which can improve the overall mechanical properties and water resistance . However, a chain reaction, which is difficult to control during processing, always occurs when blending or extruding PA6 and epoxy resin . Polytetrafluoroethylene (PTFE) is a component that can be used to improve the water resistance when blending with PA6 or PA66, but there is some decline in impact strength compared with pristine Nylon resins .…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of polyfunctional silane coupling agent and styrene acrylonitrile copolymer on the water‐resistant and mechanical performances of glass fiber–reinforced polyamide 6

Wang

Yang

et al. 2019

Polymers for Advanced Techs

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Adverse effects of a high-water absorption rate on properties of a glass fiberreinforced polyamide 6 (GF-PA6) composite significantly reduce performance and limit application in humid environments. In this paper, a polyfunctional silane (PFS) coupling agent with amino (-NH 2 ) and imino (-NH) groups and styrene acrylonitrile copolymer (SAN) were added to a composite, GF-PA6, to prepare GF-PA6/SAN/ PFS composites via melt blending in a twin-screw extruder. The effects of SAN and PFS content on the static and dynamic mechanical properties of the composites before and after water absorption were investigated in detail. The microstructure of the fracture surface was analyzed by a scanning electron microscope (SEM). The results show that the addition of SAN and PFS could effectively inhibit water absorption of the GF-PA6 composites. The alkoxyl groups on PFS reacted chemically with the nitrile groups of SAN, which enriched SAN on the interface between the fiber and matrix during the extrusion and mixing process to improve the effect of water prevention. Therefore, the mechanical properties of the wet state were notably improved while preventing water from permeating the interface by only the addition of a small amount of SAN and PFS. Dynamic mechanical analysis (DMA) results showed that the addition of PFS improved the compatibility of PA6 with SAN and enhanced the interface adhesion between fiber and PA6. In terms of test result of the comprehensive performance, 10 phr SAN with 0.6 phr PFS was the best dosage. KEYWORDS glass fiber (GF), polyamide 6 (PA6), polyfunctional silane (PFS) coupling agent, styrene acrylonitrile copolymer (SAN)

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Thermal–oxidative degradation and accelerated aging behavior of polyamide 6/epoxy resin‐modified montmorillonite nanocomposites

Cited by 13 publications

References 45 publications

Polyblend Nanocomposites

Polyblend Nanocomposites

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

Synergistic effect of polyfunctional silane coupling agent and styrene acrylonitrile copolymer on the water‐resistant and mechanical performances of glass fiber–reinforced polyamide 6

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