Functionalized hexagonal-shaped potassium titanate/PA66 composite for improved wear resistance

Mun, Hyung Jin; Kim, Jae Ik; Nam, Kwang Woo; Gu, Bo Ram; Ryu, Soo Hyung

doi:10.1007/s00289-020-03307-z

Cited by 5 publications

(4 citation statements)

References 35 publications

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“…The occurrence of plastic deformation has been reported because the temperature of the contact surface of the specimen is increased due to friction between specimen and roller during the wear test. 21,22 Morphology of the worn surface of MoS 2 /PA-6,6 composites is significantly affected by content and exfoliation of MoS 2 (Figure 6(b) and 6(g)). With increasing filler content, plastic deformation of the surface is reduced, and it becomes more significant for ex-MoS 2 .…”

Section: Resultsmentioning

confidence: 99%

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Wear characteristics of exfoliated MoS₂/polyamide-6,6 composite

Kim

Ryu

2021

Journal of Elastomers & Plastics

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Effect of exfoliation of MoS2 on the wear characteristics of the MoS2/PA-6,6 composite is investigated. Exfoliation of MoS2 is identified using X-ray diffraction, Raman spectroscopy, and transmission electron microscopy. Wear loss of composites is done using Taber abrasion tester with CS-17 abrasive wheel and atomic force microscope is used to characterize the worn surface. It is observed that wear loss of MoS2/PA-6,6 composite is strongly affected by content and exfoliation of MoS2. Wear loss of composites is decreased by the addition of MoS2 irrespective of exfoliation and it is improved with increasing filler content. Exfoliated MoS2/PA-6,6 composites show improved wear characteristic, that is, reduced wear loss, compared to the pristine MoS2/PA-6,6 composite. Addition of MoS2 induces less plastic deformation of the worn surface of composites, and it is more distinct for exfoliated MoS2.

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Section: Resultsmentioning

confidence: 99%

“…9 Mun also reported that agglomeration of potassium titanate at high content induced degradation of wear loss. 21 .…”

Section: Resultsmentioning

confidence: 99%

Wear characteristics of exfoliated MoS₂/polyamide-6,6 composite

Kim

Ryu

2021

Journal of Elastomers & Plastics

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“…In this study, tungsten microparticles were used as the shielding material, and polyamide nylon resin (PA66) was selected as the polymer material. When manufactured as a shielding barrier, the product must exhibit good mechanical strength, and PA66 is excellent in this respect [ 16 ]. A core tenet of the injection molding process is to set the process conditions to facilitate easy injection molding while maintaining good mechanical and chemical properties and a reliable compounding process for material mixing [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Shielding Material Dispersion Characteristics and Shielding Efficiency for Manufacturing Medical X-ray Shielding Barriers

Kim¹

2022

Materials

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During medical diagnoses, X-ray shielding barriers are used to protect against direct and indirect X-rays. Currently, lead is used as the primary material for shielding barriers; however, the demand for eco-friendly shielding barriers has been increasing. Conventionally, shielding barriers are manufactured using a mechanically bonded combination of lead and aluminum; however, in this study, a plastic-based injection-molded product was developed using tungsten as an eco-friendly alternative to lead. A new process technology was required for mixing tungsten—which can be difficult to process—with a polymer. Consequently, the mixing conditions within the injection molding machine and the related compounding technology factors were analyzed. The process technology considered the pre-mixing method using powdery polymer, particle dispersion method, number of screw rotations, and amount of filler input. The product’s shielding performance was then analyzed. The tungsten content of the 2-mm thick barrier manufactured using the proposed method was 90 wt%, and the lead equivalent was 0.321 mmPb. To increase the effectiveness of injection molding in the manufacturing process, specific hourly compounding conditions were proposed. Consequently, the process technology method developed in this study can be considered suitable for manufacturing various shielding barriers.

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“…The eco-friendly shielding materials used in this study were tungsten, which has a higher density than lead and an excellent shielding performance; and barium sulfate and bismuth oxide, which have economic advantages [18]. In addition, a polyamide nylon resin (PA66), which exhibits excellent mechanical strength, was selected as a polymer material to be mixed during the mold injection of this composite material [19,20].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation According to Polymer Encapsulation Characteristics of Eco-Friendly Plastic Gamma-Ray Shield

Kim

2022

Coatings

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To eliminate the exposure of medical staff to radiopharmaceuticals during nuclear medicine tests, a new process technology was proposed for manufacturing gamma-ray shields used in nuclear medicine. In the case of manufacturing the existing gamma-ray shield, a method of increasing the content of the shielding material in the mixed material is used to improve the shielding performance. However, it is impossible to improve the shielding performance by simply increasing the content of the shielding material. Therefore, this study aims to present the optimal conditions for improving the miscibility between composite materials. Following the additional mixing of barium sulfate and bismuth oxide with tungsten, a syringe shield was developed via a plastic injection mold process. When tungsten was solely used or in combination with other shielding materials, polymer encapsulation occurred, and miscibility between composite materials was observed. Based on these results, the optimal conditions in terms of eco-friendly materials, economic feasibility, and improvement in shielding performance were determined. The findings of this study reveal that when tungsten and the polymers are combined, the polymer encapsulation is optimal, the particles are uniformly dispersed, and the shielding performance is significantly improved. With a 99mTc source, a 6.9% improvement in the shielding performance is achieved compared with the use of lead.

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Functionalized hexagonal-shaped potassium titanate/PA66 composite for improved wear resistance

Cited by 5 publications

References 35 publications

Wear characteristics of exfoliated MoS₂/polyamide-6,6 composite

Wear characteristics of exfoliated MoS₂/polyamide-6,6 composite

Comparison of Shielding Material Dispersion Characteristics and Shielding Efficiency for Manufacturing Medical X-ray Shielding Barriers

Performance Evaluation According to Polymer Encapsulation Characteristics of Eco-Friendly Plastic Gamma-Ray Shield

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Functionalized hexagonal-shaped potassium titanate/PA66 composite for improved wear resistance

Cited by 5 publications

References 35 publications

Wear characteristics of exfoliated MoS2/polyamide-6,6 composite

Wear characteristics of exfoliated MoS2/polyamide-6,6 composite

Comparison of Shielding Material Dispersion Characteristics and Shielding Efficiency for Manufacturing Medical X-ray Shielding Barriers

Performance Evaluation According to Polymer Encapsulation Characteristics of Eco-Friendly Plastic Gamma-Ray Shield

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Wear characteristics of exfoliated MoS₂/polyamide-6,6 composite

Wear characteristics of exfoliated MoS₂/polyamide-6,6 composite