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How to Install TEMPO in Dielectric Polymers—Their Rational Design toward Energy‐Storable Materials
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2018-11-26 , DOI: 10.1002/marc.201800734
Yang Feng 1 , Takeo Suga 2 , Hiroyuki Nishide 2 , Yoshimichi Ohki 3 , George Chen 1 , Shengtao Li 1
Affiliation  

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.

中文翻译:

如何在介电聚合物中安装TEMPO-他们针对储能材料的合理设计

极性基团和电荷传输能力在有机聚合物的介电性能中起着重要作用,因此在用作电容器材料时会影响电能密度。在这里,研究了一系列含有2,2,6,6-四甲基哌啶-1-氧基(TEMPO)自由基的聚合物的介电性能和电导率。净自由基聚合物聚(甲基丙烯酸TEMPO)(PTMA)具有高介电常数,但击穿强度差。引入聚甲基丙烯酸甲酯(PMMA)作为绝缘聚合物,该绝缘聚合物具有较高的击穿电阻率以及PTMA的分子设计。TEMPO甲基丙烯酸酯和甲基丙烯酸甲酯的共聚物,P(TMA- r-MMA),具有较高的击穿强度,但介电常数很低。与TEMPO混合的PMMA表现出最高的电能密度7.4 J cm -3(作为对照,PTMA的电能密度为0.48 J cm -3),同时具有高介电常数(≈6.8)和高击穿强度(≈500MV) m -1)。它受益于混合物中的远距离电荷传输,而不是散装电荷传输,这与PTMA中的批量电荷传输和P(TMA - r- MMA)中的短距离电荷传输不同。这些结果表明,位于高击穿矩阵中的TEMPO部分导致电容器中的高能量存储密度。
更新日期:2018-11-26
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