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Flexible and Transparent High-Dielectric-Constant Polymer Films Based on Molecular Ferroelectric-Modified Poly(Vinyl Alcohol)
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-03-27 , DOI: 10.1021/acsmaterialslett.0c00086 Yunyun Yang 1, 2 , Yusen Zhao 2 , Jun Liu 3 , Zekun Nie 1 , Jun Ma 1 , Mutian Hua 2 , Yucheng Zhang 2 , Xufu Cai 1 , Ximin He 2
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-03-27 , DOI: 10.1021/acsmaterialslett.0c00086 Yunyun Yang 1, 2 , Yusen Zhao 2 , Jun Liu 3 , Zekun Nie 1 , Jun Ma 1 , Mutian Hua 2 , Yucheng Zhang 2 , Xufu Cai 1 , Ximin He 2
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Organic ferroelectrics with high dielectric constant have received substantial attention for sustainable and flexible energy storage. Here, we report a high-κ dielectric, optically transparent, mechanically strong and flexible dielectric polymer produced by in situ formation of biaxial ferroelectric-molecule-modified poly(vinyl alcohol) (PVA). The composite film was fabricated by solution casting of a PVA solution containing water-soluble dielectric crystals [Hdabco]ClO4. Atomic force microscopic and polarized optical microscopic studies showed a uniform dispersion of TEDA.C crystals with tunable rod-like or dendritic microstructures in the PVA matrix. Because of the good compatibility and hydrogen bonds between PVA and TDEA.C, the modified PVA films presented a significant enhancement of the dielectric constant and energy storage density by 10–100-fold over neat PVA. The polarization-electric loops indicated that the PVA composite films possessed increased saturation polarization in comparison to neat PVA film. The remnant polarization of PVA composite films was improved by around 3200 times with 9 wt % TEDA.C. Also, the TEDA.C@PVA films exhibited 85% transparency throughout the visible spectrum, 116% increase in storage modulus, and 274% elongation at fracture. These unprecedented high-κ dielectric, optical, and mechanical properties may break the restrictions in the applications of traditional ferroelectric materials and greatly expand the usage of dielectric polymers in broad fields.
中文翻译：
基于分子铁电改性的聚乙烯醇的柔性透明高介电常数聚合物薄膜
具有高介电常数的有机铁电材料已受到可持续性和柔性能量存储的广泛关注。在这里，我们报告了通过原位形成双轴铁电分子改性的聚乙烯醇（PVA）制成的高κ电介质，光学透明，机械强度高和柔性的电介质聚合物。通过溶液浇铸含有水溶性介电晶体[Hdabco] ClO 4的PVA溶液来制造复合膜。。原子力显微镜和偏光显微镜研究表明，TEDA.C晶体在PVA基质中具有均匀的棒状或树突状微结构均匀分散。由于PVA与TDEA.C之间的良好相容性和氢键，改性PVA膜的介电常数和储能密度比纯PVA显着提高了10-100倍。极化电回路表明，与纯净的PVA薄膜相比，PVA复合薄膜的饱和极化强度更高。使用9 wt％的TEDA.C，PVA复合膜的剩余极化率提高了约3200倍。另外，TEDA.C @ PVA薄膜在整个可见光谱中显示85％的透明度，116％的储能模量增加和274％的断裂伸长率。这些空前的高κ介电，光学，
更新日期：2020-03-27
中文翻译：
基于分子铁电改性的聚乙烯醇的柔性透明高介电常数聚合物薄膜
具有高介电常数的有机铁电材料已受到可持续性和柔性能量存储的广泛关注。在这里，我们报告了通过原位形成双轴铁电分子改性的聚乙烯醇（PVA）制成的高κ电介质，光学透明，机械强度高和柔性的电介质聚合物。通过溶液浇铸含有水溶性介电晶体[Hdabco] ClO 4的PVA溶液来制造复合膜。。原子力显微镜和偏光显微镜研究表明，TEDA.C晶体在PVA基质中具有均匀的棒状或树突状微结构均匀分散。由于PVA与TDEA.C之间的良好相容性和氢键，改性PVA膜的介电常数和储能密度比纯PVA显着提高了10-100倍。极化电回路表明，与纯净的PVA薄膜相比，PVA复合薄膜的饱和极化强度更高。使用9 wt％的TEDA.C，PVA复合膜的剩余极化率提高了约3200倍。另外，TEDA.C @ PVA薄膜在整个可见光谱中显示85％的透明度，116％的储能模量增加和274％的断裂伸长率。这些空前的高κ介电，光学，
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