当前位置：
X-MOL 学术
›
Macromolecules
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Tuning Conformational H-Bonding Arrays in Aromatic/Alicyclic Polythiourea toward High Energy-Storable Dielectric Material
Macromolecules ( IF 5.1 ) Pub Date : 2019-11-11 , DOI: 10.1021/acs.macromol.9b01785 Yang Feng 1, 2 , Yui Hasegawa 2 , Takeo Suga 2 , Hiroyuki Nishide 2 , Liuqing Yang 1 , George Chen 1 , Shengtao Li 1
Macromolecules ( IF 5.1 ) Pub Date : 2019-11-11 , DOI: 10.1021/acs.macromol.9b01785 Yang Feng 1, 2 , Yui Hasegawa 2 , Takeo Suga 2 , Hiroyuki Nishide 2 , Liuqing Yang 1 , George Chen 1 , Shengtao Li 1
Affiliation
|
Polythioureas (PTUs) have been investigated as a dielectric material for an energy-storable capacitor in both experimental and computational approaches. However, the effect of dipolar polarization, closely associated with conformational H-bonding arrays, on dielectric properties under the operating frequency has never been studied in PTUs. Here, a series of PTUs with different spacers and additional dipoles are synthesized to explore the influence of conformations in thiourea units on their dielectric properties. The additional dipolar substituent (−COOH) contributes to a high dielectric constant, while accompanying a remarkable dielectric loss. Alternatively, a random copolymer is prepared to adjust the −COOH content, which displays a high dielectric constant and a suppressed dielectric loss. However, it requires strict control of the segmental ratio to meet the energy-storage demand. A neat alicyclic PTU with a flexible cyclohexyl spacer also exhibited a high dielectric constant and a low dielectric loss because of its rich trans/trans conformation, which brings about an increasing effective dipole moment per unit volume. Meanwhile, it retains high breakdown strength, thus leading to high electric energy density (Ue ≈ 10 J/cm3). These results suggest that tuning conformational H-bonding arrays based on molecular design is a more effective way to improve the dielectric properties of PTUs toward a very high energy storable material.
中文翻译：
将芳香/脂环式聚硫脲中的构象氢键阵列向高能存储介电材料调谐
聚硫脲（PTU）已在实验和计算方法中作为储能电容器的介电材料进行了研究。但是，从未在PTU中研究与构象H键阵列紧密相关的偶极极化对工作频率下介电特性的影响。在这里，合成了一系列具有不同间隔基和其他偶极子的PTU，以探索硫脲单元中的构象对其介电性能的影响。附加的偶极取代基（-COOH）有助于提高介电常数，同时带来显着的介电损耗。或者，制备无规共聚物以调节-COOH含量，其显示出高介电常数和抑制的介电损耗。然而，它需要严格控制分段比率，以满足储能需求。具有柔性环己基间隔基的纯脂环族PTU也具有较高的介电常数和较低的介电损耗，因为它具有丰富的反式/反式构象，这导致单位体积的有效偶极矩增加。同时，它保持高击穿强度，从而导致高电能密度（ü Ë ≈10J /厘米3）。这些结果表明，基于分子设计调整构象H键阵列是一种提高PTU介电性能的非常有效的方法，这种材料可存储的能量非常高。
更新日期：2019-11-13
中文翻译：
将芳香/脂环式聚硫脲中的构象氢键阵列向高能存储介电材料调谐
聚硫脲（PTU）已在实验和计算方法中作为储能电容器的介电材料进行了研究。但是，从未在PTU中研究与构象H键阵列紧密相关的偶极极化对工作频率下介电特性的影响。在这里，合成了一系列具有不同间隔基和其他偶极子的PTU，以探索硫脲单元中的构象对其介电性能的影响。附加的偶极取代基（-COOH）有助于提高介电常数，同时带来显着的介电损耗。或者，制备无规共聚物以调节-COOH含量，其显示出高介电常数和抑制的介电损耗。然而，它需要严格控制分段比率，以满足储能需求。具有柔性环己基间隔基的纯脂环族PTU也具有较高的介电常数和较低的介电损耗，因为它具有丰富的反式/反式构象，这导致单位体积的有效偶极矩增加。同时，它保持高击穿强度，从而导致高电能密度（ü Ë ≈10J /厘米3）。这些结果表明，基于分子设计调整构象H键阵列是一种提高PTU介电性能的非常有效的方法，这种材料可存储的能量非常高。
京公网安备 11010802027423号