Nature of Ferroelectric Behavior in Main-Chain Dipolar Glass Nylons: Cooperative Segmental Motion Induced by High Poling Electric Field
Nature of Ferroelectric Behavior in Main-Chain Dipolar Glass Nylons: Cooperative Segmental Motion Induced by High Poling Electric Field
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DOI：
10.1021/acs.macromol.7b02719
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发表时间：
2018-02
期刊：
影响因子：
5.5
通讯作者：
Zhongbo Zhang;M. Litt;Lei Zhu
中科院分区：
文献类型：
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作者：
Zhongbo Zhang;M. Litt;Lei Zhu
由于高偶极酰胺基团的非合作振荡有限，芳香族尼龙等主链偶极玻璃聚合物在高能量密度和低损耗介电应用中很有前景。然而，据报道，淬火芳族尼龙在高场极化时表现出显着的铁电转换。人们希望抑制电能存储应用中的铁电开关，这需要对偶极玻璃尼龙中铁电行为的本质有基本的了解。在这项工作中，使用近 100% 无定形芳香族尼龙 Selar 来研究玻璃状尼龙中铁电性的起源。利用傅里叶变换红外光谱，发现氢键强度在松散堆积的玻璃基体中酰胺偶极子的铁电转换中起着重要作用。当氢键较弱时，例如在淬火膜中，会发生显着的铁电转换。相比之下，淬火和退火...
Main-chain dipolar glass polymers such as aromatic nylons are promising for high energy density and low loss dielectric applications because of the limited, noncooperative oscillation of highly dipolar amide groups. However, quenched aromatic nylons have been reported to exhibit significant ferroelectric switching upon high field poling. It is desirable to suppress ferroelectric switching for electric energy storage application, and this requires a fundamental understanding of the nature of ferroelectric behavior in dipolar glass nylons. In this work, a nearly 100% amorphous aromatic nylon, Selar, was used to investigate the origin of ferroelectricity in glassy nylons. Using Fourier transform infrared spectroscopy, it was found that hydrogen-bonding strength played an important role in the ferroelectric switching of amide dipoles in the loosely packed glassy matrix. When hydrogen bonding was weak such as in the quenched film, significant ferroelectric switching took place. In contrast, quenched and anneal...