Abstract:The aim of this work is obtain multiwalled carbon nanotube reinforced poly(phenylene sulfide) (PPS) nanostructured composites by melt mixing technique and further characterization of their morphological and thermal properties. Transmission electronic microscopy and scanning electron microscopy analysis were performed to evaluate the quality of multi‐walled carbon nanotubes (MWCNT) dispersion throughout the PPS matrix. The incorporation of nanofiller in polymeric matrix was responsible for an increase in crysta… Show more
“…It is well‐known that the crystallinity affects the mechanical properties of the material. [ 39,40 ] As shown in Table 1 and Figure 2F, when the crystallinity of MACFs/PPS composite paper reaches the maximum value at 60% MACFs content, the mechanical strength also is the maximum value. This is mainly because the high crystallinity effectively improves the transfer of stress from the matrix to the fibers, thus allowing the composite paper to exhibit high mechanical strength.…”
Meta-aramid paper has been widely used in transformers because of its excellent insulation properties and thermal stability. However, with the rapid development of high-voltage transformers, higher requirements are placed on the breakdown strength of meta-aramid paper. In this study, meta-aramid chopped fibers/polyphenylene sulfide (MACFs/PPS) composite paper was prepared by a combination of wet-copying and hot-rolling technology. Then the microscopic morphology, mechanical properties, crystallization behavior, insulation properties, and thermal stability of the MACFs/PPS composite paper were studied and evaluated. The experimental results showed that the breakdown strength of the MACFs/PPS composite paper was as high as 46.46 kV/ mm, which was 2.7 times higher than the famous Nomex T410 insulating paper. Meanwhile, the MACFs/PPS composite paper presented good mechanical properties and thermal stability. This paper provides a simple and versatile method for the preparation of meta-aramid composite paper with high breakdown strength.
“…It is well‐known that the crystallinity affects the mechanical properties of the material. [ 39,40 ] As shown in Table 1 and Figure 2F, when the crystallinity of MACFs/PPS composite paper reaches the maximum value at 60% MACFs content, the mechanical strength also is the maximum value. This is mainly because the high crystallinity effectively improves the transfer of stress from the matrix to the fibers, thus allowing the composite paper to exhibit high mechanical strength.…”
Meta-aramid paper has been widely used in transformers because of its excellent insulation properties and thermal stability. However, with the rapid development of high-voltage transformers, higher requirements are placed on the breakdown strength of meta-aramid paper. In this study, meta-aramid chopped fibers/polyphenylene sulfide (MACFs/PPS) composite paper was prepared by a combination of wet-copying and hot-rolling technology. Then the microscopic morphology, mechanical properties, crystallization behavior, insulation properties, and thermal stability of the MACFs/PPS composite paper were studied and evaluated. The experimental results showed that the breakdown strength of the MACFs/PPS composite paper was as high as 46.46 kV/ mm, which was 2.7 times higher than the famous Nomex T410 insulating paper. Meanwhile, the MACFs/PPS composite paper presented good mechanical properties and thermal stability. This paper provides a simple and versatile method for the preparation of meta-aramid composite paper with high breakdown strength.
“…Differently, the second crystallization occurs in the interlaminar spherulitic region. 37 Figure 4.Differential Scanning Calorimetry results obtained for PAEK/CF and PAEK/CF-Re with a magnification in the areas corresponded to the melting and crystallization temperatures.…”
The purpose of this work is to evaluate the reconsolidation of a carbon fiber composite with poly (aryl ether ketone) (PAEK)/carbon fiber laminates after suffering impacts from different energy levels (5, 10 and 30 J) and being restored by reconsolidation. For this comparison, thermal analysis, and compression after impact tests were performed to evaluate the properties of the material before and after the reconsolidation process. According to the found results, it was observed that with small damages it is possible to fully recover the material after new consolidation and for larger damages there is also a partial recovery compared to the base laminate. The material remains thermally stable in all situations, in other words, its thermal properties remain even after impact tests and reconsolidation process.
“…Although the physical, thermal and mechanical properties of PPS are widely investigated, 1–27 very few of PPS can directly be used as plastic products 28–34 . In order to improve the physical, thermal, and mechanical properties, PPS composites reinforced by fiber 14,35–43 or filled by mineral filler 44–59 have been developed. Glass fiber reinforced PPS (GF/PPS) composites are the most successful commercialization type among all kind of modified PPS materials and are widely used in aerospace, automobiles, electronics, chemical machinery due to its excellent mechanical properties, heat resistance, flame retardancy, chemical resistance and attractive cost benefit.…”
In order to use the glass fiber reinforced polyphenylene sulfide composites (GF/PPS) in high temperature environments, thermal aging performance of two kinds of commercial grade PPS composites, reinforced by 40% glass fiber, PPS‐G40 HM and 1140L4, in thermal aging temperature of 250°C was compared by tensile strength, oxidized layer, color, crystallization and melting behavior. The results showed that tensile strength of GF/PPS composites is significantly decreased with increasing of aging time below 200 h and the tensile strength of aged PPS‐G40 HM is higher than that of aged 1140L4. The thickness of dark color area is increased with increasing of aging time. The thickness of oxidized layer of 1140L4 is thinner than that of PPS‐G40 HM. However, the color of oxidized layer of PPS‐G40 HM is lighter than that of 1140L4. The recrystallization in thermal aging results in the formation of crystal with higher melting point and increased melting temperature of GF/PPS composites. It is found that addition of epoxy resin can increase the initial mechanical property and improve the thermal aging performance of GF/PPS composites. A novel modified GF/PPS composite with higher thermal aging properties was obtained.
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