| 1. |
- Badawi, Ali, et al.
(författare)
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Exploring the structural and optical properties of FeS filled graphene/PVA blend for environmental-friendly applications
- 2021
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Ingår i: Journal of Polymer Research. - : Springer Science and Business Media LLC. - 1022-9760 .- 1572-8935. ; 28
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Tidskriftsartikel (refereegranskat)abstract
- In this study, the role of iron sulfide (FeS) content on the structural and optical properties of graphene/polyvinyl alcohol (Gr/PVA) blend has been examined for environmental-friendly applications. Gr/PVA blend filled with FeS (0 to 10 wt%) were equipped using the casting technique. The prepared samples were studied via a scanning electron microscope, X-ray diffractometer, FT-IR and UV–visible-NIR spectrophotometers. XRD analysis shows that the crystallinity increases with increasing FeS concentration in the host Gr/PVA blend. UV–visible-NIR analysis shows that the direct optical bandgap of composite blends shrinks from 5.37 to 4.68eV as FeS content is increased to 10 wt%. Also, it confirms that the refractive index and optical conductivity of Gr/PVA blend could be significantly enhanced via FeS filling. FeS filled Gr/PVA blends are recommended eco-friendly applications.
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| 2. |
- Yang, Jiaojiao, et al.
(författare)
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Enhanced UV protection and water adsorption properties of transparent poly(methyl methacrylate) films through incorporation of amorphous magnesium carbonate nanoparticles
- 2021
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Ingår i: Journal of polymer research. - : Springer Nature. - 1022-9760 .- 1572-8935. ; 28:8, s. 281-
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Tidskriftsartikel (refereegranskat)abstract
- A simple solution casting approach was used to obtain transparent and flexible poly(methyl methacrylate) (PMMA) films incorporated with 1 – 4% by weight amorphous magnesium carbonate nanoparticles. Optical transparency was retained in visible wavelengths, while transmittance in the UV-B region was reduced by 22% at 310 nm and 58% at 256 nm with the addition of 4 wt. % nanoparticles. Furthermore, the incorporation of the nanoparticles was shown to provide protection for the films under UV-C irradiation (254 nm wavelength, 5 mW cm−2), with the amount of UV degradation decreasing with increasing concentration of nanoparticles. Films with incorporated nanoparticles were also shown to be able to retain adsorbed moisture much better than neat PMMA films; whereas neat PMMA films did not retain moisture, approximately 50% of the adsorbed moisture was retained in films containing 4 wt. % nanoparticles. These enhanced properties of PMMA are of great interest in applications such as flexible and transparent screens for personal electronic devices that require protection from both UV light and moisture.
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| 3. |
- Zhu, Yanji, et al.
(författare)
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Nano SiC enhancement in the BN micro structure for high thermal conductivity epoxy composite
- 2021
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Ingår i: Journal of polymer research. - : Springer. - 1022-9760 .- 1572-8935. ; 28:10
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Tidskriftsartikel (refereegranskat)abstract
- Improving the heat dissipation efficiency of electronic products is the key to the design of many modern electronic and mechanical systems. Herein, we combined the 3D network fabricating with the way of micron-nano reinforcement to prepare high thermal conductivity and excellent thermal stability composites. Epoxy resin was used as the matrix, while the silicon carbide foam (f-SiC) as skeleton and the BN/nano-SiC as thermally conductive fillers. The thermal conductivity of the EP/f-SiC/BN/nano-SiC composite reaches 3.5 W·m− 1·K− 1, which is about 16.6 times higher than that of pure epoxy resin. The characterization results of TC and infrared thermography images indicate that the EP/f-SiC/BN/nano-SiC composite possess superior heat transport performance. Meantime, the EP/f-SiC/BN/nano-SiC composite have excellent thermal stability, the THRI of EP/f-SiC/BN/nano-SiC reaches 195.8℃, which is 21.3℃ higher than that of pure EP. This work would provide a new strategy for improving the TC of polymers by using other 3D skeletons and micron-nano fillers, and is conducive to the development of high thermal conductivity and excellent thermal stability materials.
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