TY - JOUR
T1 - Dielectric Performance of Silica-Filled Nanocomposites Based on Miscible (PP/PP-HI) and Immiscible (PP/EOC) Polymer Blends
AU - He, Xiaozhen
AU - Seri, Paolo
AU - Rytoluoto, Ilkka
AU - Anyszka, Rafal
AU - Mahtabani, Amirhossein
AU - Naderiallaf, Hadi
AU - Niittymaki, Minna
AU - Saarimaki, Eetta
AU - Mazel, Christelle
AU - Perego, Gabriele
AU - Lahti, Kari
AU - Paajanen, Mika
AU - Dierkes, Wilma
AU - Blume, Anke
N1 - Funding Information:
This work was supported by the European Union's Horizon 2020 Research and Innovation Program under Grant 720858.
Funding Information:
This work was supported by the European Union’s Horizon 2020 Research and Innovation Program under Grant 720858.
Publisher Copyright:
© 2013 IEEE.
Financial transaction number:
342120799
PY - 2021/1/18
Y1 - 2021/1/18
N2 - This study compares different polymer-nanofiller blends concerning their suitability for application as insulating thermoplastic composites for High Voltage Direct Current (HVDC) cable application. Two polymer blends, PP/EOC (polypropylene/ethylene-octene copolymer) and PP/PP-HI (polypropylene/ propylene - ethylene copolymer) and their nanocomposites filled with 2 wt.% of fumed silica modified with 3-aminopropyltriethoxysilane were studied. Morphology, thermal stability, crystallization behavior dynamic relaxation, conductivity, charge trap distribution and space charge behavior were studied respectively. The results showed that the comprehensive performance of the PP/PP-HI composite is better than the one of the PP/EOC composite due to better polymer miscibility and flexibility, as well as lower charging current density and space charge accumulation. Nanosilica addition improves the thermal stability and dielectric properties of both polymer blends. The filler acts as nucleating agent increasing the crystallization temperature, but decreasing the degree of crystallinity. Dynamic mechanical analysis results revealed three polymer relaxation transitions: PP glass transition ( \beta ), weak crystal reorientation ( \alpha 1 ) and melting ( \alpha 2 ). The nanosilica introduced deep traps in the polymer blends and suppressed space charge accumulation, but slightly increased the conductivity. A hypothesis for the correlation of charge trap distribution and polymer chain transition peaks is developed: In unfilled PP/EOC and PP/PP-HI matrices, charges are mostly located at the crystalline-amorphous interface, whereas in the filled PP/EOC/silica and PP/PP-HI /silica composites, charges are mostly located at the nanosilica-polymer interface. Overall, the PP/PP-HI (55/45) nanocomposite with 2 wt.% modified silica and 0.3 wt.% of antioxidants making it a promising material for PP based HVDC cable insulation application with a reduced space charge accumulation and good mechanical properties.
AB - This study compares different polymer-nanofiller blends concerning their suitability for application as insulating thermoplastic composites for High Voltage Direct Current (HVDC) cable application. Two polymer blends, PP/EOC (polypropylene/ethylene-octene copolymer) and PP/PP-HI (polypropylene/ propylene - ethylene copolymer) and their nanocomposites filled with 2 wt.% of fumed silica modified with 3-aminopropyltriethoxysilane were studied. Morphology, thermal stability, crystallization behavior dynamic relaxation, conductivity, charge trap distribution and space charge behavior were studied respectively. The results showed that the comprehensive performance of the PP/PP-HI composite is better than the one of the PP/EOC composite due to better polymer miscibility and flexibility, as well as lower charging current density and space charge accumulation. Nanosilica addition improves the thermal stability and dielectric properties of both polymer blends. The filler acts as nucleating agent increasing the crystallization temperature, but decreasing the degree of crystallinity. Dynamic mechanical analysis results revealed three polymer relaxation transitions: PP glass transition ( \beta ), weak crystal reorientation ( \alpha 1 ) and melting ( \alpha 2 ). The nanosilica introduced deep traps in the polymer blends and suppressed space charge accumulation, but slightly increased the conductivity. A hypothesis for the correlation of charge trap distribution and polymer chain transition peaks is developed: In unfilled PP/EOC and PP/PP-HI matrices, charges are mostly located at the crystalline-amorphous interface, whereas in the filled PP/EOC/silica and PP/PP-HI /silica composites, charges are mostly located at the nanosilica-polymer interface. Overall, the PP/PP-HI (55/45) nanocomposite with 2 wt.% modified silica and 0.3 wt.% of antioxidants making it a promising material for PP based HVDC cable insulation application with a reduced space charge accumulation and good mechanical properties.
KW - charge trap distribution
KW - HVDC cable insulation
KW - nanosilica
KW - PP/EOC
KW - PP/PP-HI
KW - space charge accumulation
KW - UT-Gold-D
UR - http://www.scopus.com/inward/record.url?scp=85099723722&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2021.3052517
DO - 10.1109/ACCESS.2021.3052517
M3 - Article
AN - SCOPUS:85099723722
SN - 2169-3536
VL - 9
SP - 15847
EP - 15859
JO - IEEE Access
JF - IEEE Access
M1 - 9328245
ER -