Synthesis and characterization of thermotropic liquid crystalline polyarylate with ether ether ketone segments in the main chain

Zeng, Lei; Li, Ruosong; Chen, Peng; Xu, Jianjun; Liu, Pengqing

doi:10.1002/app.43800

Cited by 16 publications

(11 citation statements)

References 21 publications

(20 reference statements)

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“…Further, thermotropic liquid crystal polyesters were added into PEEK to reduce melt viscosity and processing temperature of the blends 17 and the block copolymers. 18 With increasing polyester segment, the block copolymers could form thermotropic liquid crystal phase. The addition of liquid crystal polyester reduced melt viscosity of the blend significantly and improved processability of the blend at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of poly(phthalazinone ether ketone ketone) copolymers with 4,4′-dihydroxybiphenyls

Dong

Bin

Jian

2020

High Performance Polymers

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Meta-poly(phthalazinone ether ketone ketone) copolymers with 4,4′-dihydroxybiphenyls (meta-PPBEKK) was synthesized with 4,4′-dihydroxybiphenyls (BP), 1,3-bis(4-fluorobenzoyl)benzene (meta-DFKK) and 4-(4-hydroxyphenyl)-2,3-diazaphthalene-1-one (DHPZ). The copolymers are high-temperature resistant and have good solubility in many solvents. With increasing molar ratio of BP to meta-DFKK from 0 to 0.2, the addition of BP improves number-average molecular masses, intrinsic viscosity, mechanical properties and fluidity of meta-PPBEKKs. When the molar ratio of BP to meta-DFKK is 0.2, the intrinsic viscosity reaches 1.14 dL g−1, the number-average molecular mass reaches 44700 g mol−1, the maximum thermal elongation ratio reaches 14 with strength of 127.1 MPa and Young’s modulus of 2.4 GPa. With increasing molar ratio of BP to meta-DFKK from 0 to 0.2, meta-PPBEKKs have improved comprehensive properties, and make sense in many fields.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of poly(phthalazinone ether ketone ketone) copolymers with 4,4′-dihydroxybiphenyls

Dong

Bin

Jian

2020

High Performance Polymers

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“…These aromatic polyamides form LC states when dissolved in a solvent (lyotropic) such as sulfuric acid. In addition, commercialization of aromatic polyesters (e.g., Xydar ® and Vectra ® ) that form LC states in melts (thermotropic) in the 1980s has sparkled continued and unabated growth of the field of LC polymers (LCPs) [3,4].…”

Section: Introductionmentioning

confidence: 99%

Thermotropic Liquid Crystalline Polymers with Various Alkoxy Side Groups: Thermal Properties and Molecular Dynamics

2019

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Two series of thermotropic liquid-crystalline polymers (TLCPs) were synthesized by reacting various dialkoxy terephthalate units with hydroquinone (HQ) and 2,6-naphthalene diol (Naph). The dialkoxy terephthalate moieties used in this study include 2,5-diethoxyterephthalate, 2,5-dibutoxyterephthalate, and 2,5-dihexyloxy-terephthalate. All the TLCPs synthesized in this study formed nematic phases. The molecular motions according to the length of the dialkoxy side groups in the TLCPs were evaluated by 13C cross-polarization/magic angle spinning nuclear magnetic resonance spectroscopy. The thermal properties and molecular dynamics of the TLCPs are found to be affected by the length of the dialkoxy side group and the aromatic diol unit in the main chain. Further, the thermal behaviors, liquid crystalline mesophases, and degree of crystallinity of the two series of TLCPs, i.e., HQ- and Naph-TLCPs, are compared.

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“…Among TLCPs, polyarylates (PARs) are a unique class of semicrystalline aromatic polyesters with high mechanical strength at elevated temperatures, excellent chemical resistance, good thermal stability, low coefficient of thermal expansion, etc . Because of the excellent physical properties, PARs have been used in a variety of application area including automobiles, precision and medical devices, electronic displays and other electrical parts, semiconductor molding compounds, decorative displays, and protective coverings . Some PARs are produced as high performance technical fibers for ropes, cables, and reinforcing materials of advanced composite .…”

Section: Introductionmentioning

confidence: 99%

Effects of plasticizer on structures, non‐isothermal crystallization, and rheological properties of polyarylates

Yoo

Song

Lee³

et al. 2017

J of Applied Polymer Sci

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We herein report the effects of plasticizer content (1–5 wt %) on the structure, non‐isothermal crystallization kinetics, thermal stability, and rheological property of a new type of multicomponent polyarylate (PAR). Fourier transform infrared spectra reveal the presence of a specific interaction between plasticizer and PAR chains, indicating the good dispersion of the plasticizer at the molecular level. The plasticizer influences on the non‐isothermal crystallization behavior of the PAR in two different ways: a mobility enhancer of PAR chains and an impurity to the crystallization of PAR. The melt‐crystallization temperature (Tmc) and enthalpy (ΔHmc) of the plasticized PARs at cooling runs are higher than those of the neat PAR, which is owing to the enhanced mobility of PAR chains by the plasticizer. On the other hand, the non‐isothermal crystallization rates at different cooling rates of 5–40 °C/min are slower for the PARs with higher plasticizer contents, which is due to the impurity effect of the plasticizer on the melt‐crystallization of PARs. Although the PARs with 1–5 wt % plasticizer have lowered thermal decomposition temperatures, compared to the neat PAR, they are thermally stable up to ∼400 °C. The complex melt viscosity of PAR with only 1 wt % plasticizer is far lower than that of the neat PAR. Overall, it is found that only 1 wt % plasticizer is quite effective to facilitate the melt‐processibility and to increase the crystallinity of PAR. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45704.

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Synthesis and characterization of thermotropic liquid crystalline polyarylate with ether ether ketone segments in the main chain

Cited by 16 publications

References 21 publications

Synthesis and characterization of poly(phthalazinone ether ketone ketone) copolymers with 4,4′-dihydroxybiphenyls

Synthesis and characterization of poly(phthalazinone ether ketone ketone) copolymers with 4,4′-dihydroxybiphenyls

Thermotropic Liquid Crystalline Polymers with Various Alkoxy Side Groups: Thermal Properties and Molecular Dynamics

Effects of plasticizer on structures, non‐isothermal crystallization, and rheological properties of polyarylates

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