Effect of crystallinity on the mechanical behavior of carbon fiber reinforced polyethylene-terephthalate (CF/PET) composites considering temperature conditions

Um, Hui Jin; Hwang, Yeon Taek; Choi, Kyung Hee; Kim, Kwang Ho

doi:10.1016/j.compscitech.2021.108745

Cited by 48 publications

(14 citation statements)

References 34 publications

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“…This is the result of a faster cooling after extrusion for the filaments with a smaller diameter, which results in less crystalline regions. [56] Depending on the degree of crystallinity, amorphous PET has a lower T g of 65 °C, while for highly semi-crystalline PET, the T g is around 92 °C. [52,[57][58][59] Table 4 shows both the initial T g from the first heating run (T g, a ) and the T g of the second heating run when the thermal history is excluded (T g, b ).…”

Section: Characterization Of the Extruded Cfr Rpet Filaments 311 Ther...mentioning

confidence: 99%

The effect of carbon fiber content on physico-mechanical properties of recycled poly(ethylene terephthalate) composites additively manufactured with fused filament fabrication

Katalagarianakis¹,

Voorde²,

Pien³

et al. 2022

Additive Manufacturing

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Section: Characterization Of the Extruded Cfr Rpet Filaments 311 Ther...mentioning

confidence: 99%

The effect of carbon fiber content on physico-mechanical properties of recycled poly(ethylene terephthalate) composites additively manufactured with fused filament fabrication

Katalagarianakis¹,

Voorde²,

Pien³

et al. 2022

Additive Manufacturing

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“…In addition, VPIM samples below 1 Hz are identified as amorphous structures in XRD measurement while crystallinity is acquired in DSC measurement because of unequal ΔH c and ΔH m , which originates from different definitions of crystalline and amorphous regions in different methods. 29 The crystalline region is defined as a three-dimensional crystal structure in Xray diffraction, but this can be regarded as the ordered organization in DSC. Thus, the crystallinity of VPIM samples below 1 Hz is attributed to the formation of ordered mesophase.…”

Section: Resultsmentioning

confidence: 99%

Regulating Mesophase via Melt Volume Pulsation on an Industrial Scale for Self-Toughening and Self-Reinforcing of Polyethylene Terephthalate

Yuan

Zhang

Qin

et al. 2022

Ind. Eng. Chem. Res.

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The enhanced toughness and balanced strength without sacrificing transparency can be achieved in polyethylene terephthalate (PET) injection-molded products by constructing ordered mesophase, but it is difficult for the present approaches to directly fabricate injection-molded products with ordered mesophase from melt because of the metastable microstructure of ordered mesophase. To address the challenge, this study employs volume-pulsation injection molding (VPIM) to introduce a vibration force field to achieve ordered mesophase formation of PET directly from melt via melt volume pulsation. According to wide-angle X-ray diffraction, differential scanning calorimetry, small-angle X-ray scattering, and dynamic mechanical analysis, molecular chains are induced to form ordered mesophase below 1 Hz, while the ordered mesophase is further developed into crystallite above 1 Hz. The ordered mesophase formed below 1 Hz is ascribed to the moderate collision of disentangled oriented PET chains under the low-frequency force field. Mechanical properties were improved, resulting from the formation of ordered mesophase. The tensile modulus and toughness of VPIM samples at 0.7 Hz are increased by 11.11 and 149.74%, respectively, compared with those of conventional injection molding specimens. The ductile−brittle transformation was observed above 1 Hz because of the transition from ordered mesophase to crystallite. This paper provides new insights into the precise regulatory mechanism of the condensed state structure and gives scientific guidance in the advanced processing of polymeric materials.

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“…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. [41,42] However, the increase in crystallinity of the composite paper does not imply an increase in mechanical properties. When MACFs content increased from 30% to 40%, the crystallinity of composite paper decreased, but the tensile strength increased.…”

Section: Crystallization Behavior Of Macfs/ Pps Composite Papermentioning

confidence: 99%

Preparation of high breakdown strength meta‐aramid composite paper reinforced by polyphenylene sulfide superfine fiber

Zhao

Yao

Xiong

et al. 2023

Polymer Engineering & Sci

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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.

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Effect of crystallinity on the mechanical behavior of carbon fiber reinforced polyethylene-terephthalate (CF/PET) composites considering temperature conditions

Cited by 48 publications

References 34 publications

The effect of carbon fiber content on physico-mechanical properties of recycled poly(ethylene terephthalate) composites additively manufactured with fused filament fabrication

The effect of carbon fiber content on physico-mechanical properties of recycled poly(ethylene terephthalate) composites additively manufactured with fused filament fabrication

Regulating Mesophase via Melt Volume Pulsation on an Industrial Scale for Self-Toughening and Self-Reinforcing of Polyethylene Terephthalate

Preparation of high breakdown strength meta‐aramid composite paper reinforced by polyphenylene sulfide superfine fiber

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