Journal ArticleDOI
Core–shell SiO2@RGO hybrids for epoxy composites with low percolation threshold and enhanced thermo-mechanical properties
TLDR
In this article, reduced graphene oxide (RGO)-encapsulated SiO2 hybrids (SiO2@RGO) were fabricated from the thermal reduction of electrostatically assembled SiO 2@GO hybrids.Abstract:
Reduced graphene oxide (RGO)-encapsulated SiO2 hybrids (SiO2@RGO) were fabricated from the thermal reduction of electrostatically assembled SiO2@GO hybrids. Then, epoxy composites, filled with SiO2, SiO2@GO and SiO2@RGO hybrids, were prepared by a solvent-free curing process, and their thermal, dielectric and thermo-mechanical properties were investigated and compared. In the SiO2@RGO/epoxy composites, the mono-dispersed SiO2 nanoparticles are firmly embedded in the thin layer of RGO nanosheets, forming unique core–shell nanostructures that effectively prevent the aggregation of RGO nanosheets in the polymer matrix, construct conductive pathways at the particle–polymer interface and afford the epoxy composites with outstanding thermo-mechanical properties. The dielectric properties of the SiO2@RGO/epoxy composites exhibit a typical percolation transition near 0.174 vol% for RGO (20 wt% of SiO2@RGO hybrids), where the dielectric constant could reach 77.23 at 1 kHz, which is 22 times that of the neat epoxy resin. Upon further increase of the loading content, the gradual contact of the filler particles leads to the formation of interfacial continuous conductive networks, and both the thermal conductivity and dielectric constant of the composites show a dramatic increase. With a filler loading of 40 wt% SiO2@RGO (0.373 vol% for RGO), a thermal conductivity of 0.452 W m−1 K−1 is obtained, which is two times larger than that of neat epoxy. In addition, SiO2@RGO/epoxy composites reveal significantly decreased coefficient of thermal expansion (CTE) and increased glass transition temperature (Tg). We believe this special core–shell SiO2@RGO structure, with its inner mechanically enhanced inorganic particles and outer interfacial conductive phase, could make full use of the enhancement effect of different components and thus endow the polymer composites with outstanding properties overall.read more
Citations
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Large-Scale Fabrication of Boron Nitride Nanosheets and Their Utilization in Polymeric Composites with Improved Thermal and Mechanical Properties
Journal ArticleDOI
Interface design for high energy density polymer nanocomposites
Hang Luo,Xuefan Zhou,Christopher Ellingford,Yan Zhang,Yan Zhang,Sheng Chen,Kechao Zhou,Dou Zhang,Christopher R. Bowen,Chaoying Wan +9 more
TL;DR: This review provides a detailed overview on the latest developments in the design and control of the interface in polymer based composite dielectrics for energy storage applications, along with an overview of existing challenges and practical limitations.
Journal ArticleDOI
Thermal transport in polymeric materials and across composite interfaces
TL;DR: In this paper, a detailed in-depth review on thermal transport in polymers and interfaces is presented, where various recent techniques to improve thermal conductivity of polymer and interfaces are illustrated through examples and case studies.
Journal ArticleDOI
Fabrication of graphene oxide–alumina hybrids to reinforce the anti-corrosion performance of composite epoxy coatings
TL;DR: Graphene oxide-alumina (GO-Al2O3) sheet hybrids were fabricated using GO as a precursor, then anchoring Al2O 3 on GO sheets with the help of 3-aminopropyltriethoxysilane as mentioned in this paper.
Journal ArticleDOI
Reduced Graphene Oxide Heterostructured Silver Nanoparticles Significantly Enhanced Thermal Conductivities in Hot-Pressed Electrospun Polyimide Nanocomposites.
Yongqiang Guo,Xutong Yang,Kunpeng Ruan,Jie Kong,Mengyao Dong,Jiaoxia Zhang,Jiaoxia Zhang,Junwei Gu,Junwei Gu,Zhanhu Guo +9 more
TL;DR: Thermal conductivities calculated by the established improved thermal conduction model were relatively closer to the experimental results than the results obtained from other classical models.
References
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Journal ArticleDOI
The reduction of graphene oxide
Songfeng Pei,Hui-Ming Cheng +1 more
TL;DR: In this paper, the state-of-the-art status of the reduction of GO on both techniques and mechanisms is reviewed, where the reduction process can partially restore the structure and properties of graphene.