TY - JOUR
T1 - How to Install TEMPO in Dielectric Polymers—Their Rational Design toward Energy-Storable Materials
AU - Feng, Yang
AU - Suga, Takeo
AU - Nishide, Hiroyuki
AU - Ohki, Yoshimichi
AU - Chen, George
AU - Li, Shengtao
N1 - Funding Information:
This research was partly supported by 111 Project (No. B17036) from Ministry of Education and State Ministration of Foreign Experts Affairs, China and by a Grant-in-Aid for Scientific Research (No. 18H03921) from MEXT, Japan. Y.F. acknowledges support from the China Scholarship Council (No. 201606280068).
Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/2/1
Y1 - 2019/2/1
N2 - Polar groups and the charge-transport capability play significant roles in the dielectric properties of organic polymers, and thus influence the electric energy density upon application as a capacitor material. Here, the dielectric properties and electric conductivity of a series of polymers containing 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radicals are investigated. The neat radical polymer poly(TEMPO methacrylate) (PTMA) has a high dielectric constant but poor breakdown strength. Poly(methyl methacrylate) (PMMA) is introduced as an insulating polymer with high resistivity on breakdown, along with molecular design of PTMA. Copolymers of TEMPO methacrylate and methyl methacrylate, P(TMA-r-MMA), exhibit high breakdown strengths but low dielectric constants. PMMA blended with TEMPO exhibits the highest electric energy density of 7.4 J cm −3 (that of PTMA is 0.48 J cm −3 as a control), with both a high dielectric constant (≈6.8) and a high breakdown strength (≈500 MV m −1 ). It benefits from long-range but not bulk charge transport in the blends, which is different from the bulk charge transport in PTMA and the short-range charge transport in P(TMA-r-MMA). These results indicate that the TEMPO moiety located in the high breakdown matrix leads to a high energy-storage density in the capacitor.
AB - Polar groups and the charge-transport capability play significant roles in the dielectric properties of organic polymers, and thus influence the electric energy density upon application as a capacitor material. Here, the dielectric properties and electric conductivity of a series of polymers containing 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radicals are investigated. The neat radical polymer poly(TEMPO methacrylate) (PTMA) has a high dielectric constant but poor breakdown strength. Poly(methyl methacrylate) (PMMA) is introduced as an insulating polymer with high resistivity on breakdown, along with molecular design of PTMA. Copolymers of TEMPO methacrylate and methyl methacrylate, P(TMA-r-MMA), exhibit high breakdown strengths but low dielectric constants. PMMA blended with TEMPO exhibits the highest electric energy density of 7.4 J cm −3 (that of PTMA is 0.48 J cm −3 as a control), with both a high dielectric constant (≈6.8) and a high breakdown strength (≈500 MV m −1 ). It benefits from long-range but not bulk charge transport in the blends, which is different from the bulk charge transport in PTMA and the short-range charge transport in P(TMA-r-MMA). These results indicate that the TEMPO moiety located in the high breakdown matrix leads to a high energy-storage density in the capacitor.
KW - TEMPO
KW - breakdown strength
KW - dielectric polymers
KW - energy-storage capacitors
KW - radical polymers
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U2 - 10.1002/marc.201800734
DO - 10.1002/marc.201800734
M3 - Article
C2 - 30474899
AN - SCOPUS:85057331369
SN - 1022-1336
VL - 40
JO - Macromolecular Rapid Communications
JF - Macromolecular Rapid Communications
IS - 4
M1 - 1800734
ER -