scholarly journals On the Silica Surface Modification and Its Effect on Charge Trapping and Transport in PP-Based Dielectric Nanocomposites

2020 ◽  
Vol 2 (8) ◽  
pp. 3148-3160 ◽  
Author(s):  
Amirhossein Mahtabani ◽  
Ilkka Rytöluoto ◽  
Rafal Anyszka ◽  
Xiaozhen He ◽  
Eetta Saarimäki ◽  
...  
Keyword(s):  
Surface Modification ◽  
Silica Surface ◽  
Charge Trapping ◽  
Silica Surface Modification

scholarly journals Silica Surface-Modification for Tailoring the Charge Trapping Properties of PP/POE Based Dielectric Nanocomposites for HVDC Cable Application

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 87719-87734
Author(s):  
Xiaozhen He ◽  
Ilkka Rytoluoto ◽  
Rafal Anyszka ◽  
Amirhossein Mahtabani ◽  
Eetta Saarimaki ◽  
...  
Keyword(s):  
Surface Modification ◽  
Silica Surface ◽  
Charge Trapping ◽  
Silica Surface Modification

scholarly journals Surface Modification of Fumed Silica by Dry Silanization for PP/POE-based Dielectric Nanocomposites

2019 ◽  
pp. 32-36
Author(s):  
Xiaozhen He ◽  
Ilkka Rytöluoto ◽  
Amirhossein Mahtabani ◽  
Eetta Saarimäki ◽  
Kari Lahti ◽  
...  
Keyword(s):  
Surface Modification ◽  
Dielectric Properties ◽  
High Voltage ◽  
Silica Surface ◽  
Trap Depth ◽  
Charge Trapping ◽  
Depolarization Current ◽  
Dry Process ◽  
Green Approach ◽  
Silica Surface Modification

A systematic study of the influence of surface modification of nanosilica with coupling agents having different polarities on the dielectric properties of a PP/POE/silica blend was performed. The main goal of this investigation was to tailor the chemical composition of the silica surface, in order to modify the charge trapping properties of the nanocomposites. For the modification of the silica surface, a “green” approach was utilized: a dry silanization method, which is performed without the need of a solvent. The results of the thermogravimetric analysis (TGA) indicate that the dry process is an effective method to perform silica surface modification using alkoxysilanes.The charge trapping properties were studied by Thermally Stimulated Depolarization Current (TSDC) measurements. The obtained TSDC results show significant differences in charge trapping properties of PP/POE composites filled with differently modified silicas. Polar functional groups attached to the surface of the silica appear to have a strong effect on the charge trapping properties: The trap depth distribution becomes deeper and the trap density decreases to significantly lower levels.All results show that incorporation of surface modified nanosilica into a PP/POE matrix is a promising approach to tailor its dielectric properties. Further development of these composites may lead to benefits for application in high-voltage cable and capacitor applications.Keywords: silica surface modification, dry silanization, charge trapping, PP, POE, TSDC, high voltage cable.

scholarly journals Surface Modification of Fumed Silica by Plasma Polymerization of Acetylene for PP/POE Blends Dielectric Nanocomposites

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1957 ◽  
Author(s):  
Xiaozhen He ◽  
Ilkka Rytöluoto ◽  
Rafal Anyszka ◽  
Amirhossein Mahtabani ◽  
Eetta Saarimäki ◽  
...  
Keyword(s):  
Surface Modification ◽  
Photoelectron Spectroscopy ◽  
Plasma Polymerization ◽  
Silica Surface ◽  
Plasma Reactor ◽  
Charge Trapping ◽  
Plasma Modification ◽  
Modified Silica ◽  
Depolarization Current ◽  
X Ray

Novel nanocomposites for dielectric applications-based polypropylene/poly(ethylene-co-octene) (PP/POE) blends filled with nano silica are developed in the framework of the European ‘GRIDABLE’ project. A tailor-made low-pressure-plasma reactor was applied in this study for an organic surface modification of silica. Acetylene gas was used as the monomer for plasma polymerization in order to deposit a hydrocarbon layer onto the silica surface. The aim of this modification is to increase the compatibility between silica and the PP/POE blends matrix in order to improve the dispersion of the filler in the polymer matrix and to suppress the space charge accumulation by altering the charge trapping properties of these silica/PP/POE blends composites. The conditions for the deposition of the acetylene plasma-polymer onto the silica surface were optimized by analyzing the modification in terms of weight loss by thermogravimetry (TGA). X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray fluorescence spectroscopy (EDX) measurements confirmed the presence of hydrocarbon compounds on the silica surface after plasma modification. The acetylene plasma modified silica with the highest deposition level was selected to be incorporated into the PP/POE blends matrix. X-ray diffraction (XRD) showed that there is no new crystal phase formation in the PP/POE blends nanocomposites after addition of the acetylene plasma modified silica. Differential scanning calorimetry results (DSC) show two melting peaks and two crystallization peaks of the PP/POE blends nanocomposites corresponding to the PP and POE domains. The improved dispersion of the silica after acetylene plasma modification in the PP/POE blends matrix was shown by means of SEM–EDX mapping. Thermally stimulated depolarization current (TSDC) measurements confirm that addition of the acetylene plasma modified silica affects the charge trapping density and decreases the amount of injected charges into PP/POE blends nanocomposites. This work shows that acetylene plasma modification of the silica surface is a promising route to tune charge trapping properties of PP/POE blend-based nanocomposites.

Single-ion conductors for lithium batteries via silica surface modification

2008 ◽  
Vol 177 (2) ◽  
pp. 561-565 ◽  
Author(s):  
Hanjun Zhang ◽  
Xiangwu Zhang ◽  
Eric Shiue ◽  
Peter S. Fedkiw
Keyword(s):  
Surface Modification ◽  
Lithium Batteries ◽  
Silica Surface ◽  
Silica Surface Modification ◽  
Single Ion Conductors ◽  
Ion Conductors

scholarly journals The effect of concentration and silica surface modification on the poly(butyl acrylate-co-methyl methacrylate) properties

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zrinka Buhin Šturlić ◽  
Mirela Leskovac ◽  
Krunoslav Žižek ◽  
Sanja Lučić Blagojević
Keyword(s):  
Surface Modification ◽  
Emulsion Polymerization ◽  
Silica Surface ◽  
Film Formation ◽  
Content Type ◽  
Nonionic Emulsifier ◽  
The Matrix ◽  
Silica Surface Modification ◽  
Water Ratio

Purpose The purpose of this paper is to prepare stabile emulsions with 0–15% of colloidal silica and high monomer/water ratio and to investigate the influence of silica addition and surface modification on the polyacrylate properties. Design/methodology/approach Improving the properties of the composite can be achieved by optimizing the compatibility between the phases of the composite system with improving the interactions at the matrix/filler interface. Therefore, the silica surface was modified with nonionic emulsifier octylphenol ethoxylate, cationic initiator 2,2'-azobis-(amidinopropane dihydrochloride) and 3-methacryloxypropyltrimethoxysilane and polyacrylate/silica nanocomposites were prepared via in situ emulsion polymerization. Particle size distribution, rheological properties of the emulsions and morphology, thermal properties and mechanical properties of the film prepared from the emulsions were investigated. Findings Polyacrylate/silica systems with unmodified silica, silica modified with nonionic emulsifier and cationic initiator have micrometer, while pure PA matrix and systems with silica modified with silane have nanometer particle sizes. Addition and surface modification of the filler increased emulsion viscosity. Agglomeration of silica particles in composites was reduced with silica surface modification. Silica filler improves thermal stability and tensile strength of polyacrylate. Originality/value This paper provides broad spectrum of information depending on filler surface modification and latex preparation via in situ emulsion polymerization and properties with high amount of filler and monomer/water ratio with the aim that prepared latex is suitable for film formation and final application.

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