Hydrolytic and thermal oxidative degradation behavior of thermotropic aromatic–aliphatic copolyesters

Wei, Peng; Wang, Yanping; Xia, Yueyuan; He, Yong; Wang, Yimin

doi:10.1007/s10973-016-5975-8

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…The DTGA thermograms shown in Figure 6 exhibited two peaks, the first one located at 495-498 C with high intensity and the second one located at 660-670 C with wider peaks, corresponding to the chain breaking and carbonization processes. 32 These results also confirmed that these copolyesters had good thermal stability.…”

Section: Structural Characterizationsupporting

confidence: 65%

Processability‐enhanced aromatic thermotropic liquid crystalline copolyesters via the introduction of the unsymmetrical units

Pan

Gao

Zhao

et al. 2023

J of Applied Polymer Sci

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A series of ternary thermotropic liquid crystalline copolyesters was synthesized through a simple one-pot melt condensation based on 4-hydroxybenzoic acid (HBA), 6-hydroxy-2-naphthoic acid (HNA) and 4-hydroxy-2-naphthoic acid (4-HNA). The structures were modified via the introduction of the asymmetric 4-HNA unit. High glass transition temperature values (>80 C) and relatively low melting temperature values (<265 C) were achieved with 4-HNA molar fraction of over 0.5%, and the copolymer exhibited 5% degradation temperatures of 442-453 C and the char yields of 35.80%-36.74% at 800 C. This indicated that the introduction of asymmetric 4-HNA blocks into the backbone provides a "torsion axis" to regulate the dense stacking between different main-chains, which was crucial for the mobility of polyester during thermal processes. Moreover, crystallinity decreased with the increase of 4-HNA content. The incorporation of 4-HNA also endowed the obtained copolyester fiber with a skin-core structure and microfiber morphology. Due to the excellent temperature resistance and fibrous morphology of P-HBA/HNA/4-HNA. This work provided a novel strategy to synthesize aromatic thermotropic liquid crystalline copolyesters, which can be promising candidates for processing additives or reinforcing materials with improved processing properties, and potential application in processing, personal protection, and other extreme temperature environments.

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Section: Structural Characterizationsupporting

confidence: 65%