A high dielectric constant copolyamide based on high dipole density

Lv, Jiahao; Huang, Lei; Ning, Jingyi; Tian, Chong; Chen, Honggang; Zeng, Fanhao; Kong, Weibo; Cai, Xufu

doi:10.1007/s10965-021-02877-4

Cited by 5 publications

(3 citation statements)

References 53 publications

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“…Furthermore, the aromatic amide groups of TPA/PAP‐ or IPA/PAP‐derived repeat units restrict the overall chain mobility of TPEAs, leading to a decrease in dielectric constants across the applied frequency range. [ 29,31,32 ]…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the aromatic amide groups of TPA/PAP-or IPA/PAP-derived repeat units restrict the overall chain mobility of TPEAs, leading to a decrease in dielectric constants across the applied frequency range. [29,31,32] In general, dielectric loss is the dissipation of energy through the movement of charges in an alternating electric field as polarization switches direction. For neat TLCP, a broad dielectric loss peak was observed across the applied frequency range (Figure 11B), linked to energy dissipation through the movement of dipoles of ester groups in the main chains.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

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Effects of Para‐ or Meta‐Aromatic Amide Units on the Microstructure, Thermal, Mechanical, Rheological, and Dielectric Properties of Thermotropic Liquid Crystalline Poly(ester amide)s

Song,

Park,

Tang

et al. 2023

Macro Chemistry & Physics

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The impact of para‐ and meta‐aromatic amide repeat units on the microstructure, thermal behavior, mechanical properties, rheological characteristics, and dielectric properties of thermotropic liquid crystalline poly(ester amide)s (TPEAs) is reported. For this purpose, two distinct series of TPEAs are synthesized using 75.0 mol% of 4‐hydroxybenzoic acid (HBA) and 25.0–17.5 mol% of 6‐hydroxy‐2‐naphtoic acid (HNA) with 0.0–7.5 mol% terephthalic acid/para‐acetylaminophenol (TPA/PAP) or isophthalic acid/para‐acetylaminophenol (IPA/PAP) are synthesized via bulk polycondensation reaction. Infrared and electron microscopic data reveal the existence of intermolecular hydrogen bonds and associated fibrillar structures of TPEAs with TPA/PAP‐ or IPA/PAP‐based aromatic amide units. Accordingly, the glass transition temperatures, dynamic storage moduli, and melt viscosities of TPEAs increased with the increment of the aromatic amide units, although they are higher for TPEAs with IPA/PAP‐derived units, compared to TPEAs with TPA/PAP‐derived units. The melting temperatures of TPEAs increase with the para‐aromatic amide unit owing to the intermolecular hydrogen bonding and the rigid linearity, whereas the melting points decrease with the meta‐aromatic amide unit due to the structural nonlinearity. Interestingly, the dielectric constants and losses of TPEAs decrease with the aromatic amide unit content, which is even dominant for TPEAs with IPA/PAP‐based repeat units. TPEAs can be thus utilized as super‐engineering plastics, industrial fibers, printed circuit board materials, etc., requiring enhanced mechanical and thermal transition properties but lower dielectric constants and losses.

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Section: Resultsmentioning

confidence: 99%

Section: Dielectric Propertiesmentioning

confidence: 99%

Effects of Para‐ or Meta‐Aromatic Amide Units on the Microstructure, Thermal, Mechanical, Rheological, and Dielectric Properties of Thermotropic Liquid Crystalline Poly(ester amide)s

Song,

Park,

Tang

et al. 2023

Macro Chemistry & Physics

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show abstract

“…12 Generally, introducing pores and decreasing the polarity are the two most effective ways to decrease the dielectric constant of organic polymers. 13,14 Although the introduction of pores can effectively reduce the dielectric constant of the polymer films, porous films often suffer from poor thermal properties and mechanical strength due to the presence of pores, making them too fragile to be used. 15 In addition, the structure, size and distribution of pores are difficult to precisely control, and the preparation process of porous membranes is usually complicated and not suitable for large-scale preparation.…”

Section: Introductionmentioning

confidence: 99%