Synthesis and properties of low dielectric thermotropic liquid crystal polyarylates

被引：5

作者：

He, Boang ^{[1
]}

Chen, Yufeng ^{[1
]}

Liang, Yuan ^{[1
]}

Wan, Hai ^{[1
]}

Liu, Wei ^{[1
]}

Xu, Zhongtao ^{[1
]}

Dong, Shihang ^{[1
]}

Chen, Yuwei ^{[2
]}

Wei, Peng ^{[3
]}

Huang, Shuohan ^{[1
]}

He, Yong ^{[1
]}

Wang, Yanping ^{[1
]}

Xia, Yumin ^{[1
]}

机构：

[1] Donghua Univ, Coll Mat Sci & Engn, Innovat Ctr Text Sci & Technol, Coll Phys,State Key Lab Modificat Chem Fibers & Po, Shanghai 201600, Peoples R China

[2] Qingdao Univ Sci & Technol, Key Lab Rubber Plast, Shandong Prov Key Lab Rubber Plast, Minist Educ, Qingdao 266042, Peoples R China

[3] Zhongyuan Univ Technol, Coll Text, Henan Key Lab Funct Text Mat, Zhengzhou 450007, Peoples R China

来源：

POLYMER | 2024年 / 312卷

关键词：

Low dielectric; Thermotropic liquid crystal polyarylate; Bulky monomers; Fluorinated monomers; THERMAL-BEHAVIOR; POLYIMIDES; DEGRADATION; STABILITY; POLYMERS; ACID;

D O I：

10.1016/j.polymer.2024.127626

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

In this study, a series of low dielectric liquid crystal polyarylates were designed and synthesized through the acetylation of hydroxyl-containing monomers followed by melt polycondensation with 4-hydroxybenzoic acid (HBA), 6-hydroxy-2-naphthoic acid (HNA), bisphenol A (BPA), bisphenol AF (BPAF), terephthalic acid (TA) acid and 2,3,5,6-tetrafluoroterephthalic acid (TFTA). The molar ratio of HBA to HNA was controlled at 7:3. The structures of the acetylated monomers and polyarylates were characterized using FTIR and NMR spectroscopy, while the elemental composition of the polyarylates was analysed via XPS. WAXD and POM analyses revealed that the prepared polyarylates exhibit a single crystalline form and are capable of forming liquid crystals. DSC and TGA analyses indicated that the incorporation of bisphenol-type monomers (BPA or BPAF) disrupted the regularity of the main chain, leading to a decrease in both the melting point and thermal stability. Finally, the incorporation of bulky monomers (BPA or BPAF) and fluorinated monomers (BPAF and TFTA) into polyarylates increases free volume and decreases polarization, leading to a significant reduction in the dielectric constant.

引用

页数：12