Facile strategy and mechanism of preparing high performance intrinsic flame retarding foams based on reactive end-capped liquid crystalline all-aromatic polyester without incorporating additional flame retardants

Tang, Yanfu; Yuan, Li; Liang, Guozheng; Gu, Aijuan

doi:10.1016/j.compositesb.2019.107554

Cited by 10 publications

(5 citation statements)

References 39 publications

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“…As shown in Figure 3b, due to a liquid crystal feature of the LCT polymer resin, melted chains were aligned along the flow direction. [ 20 ] In addition, these orientations are maintained due to the cross‐linking behavior of the polymer matrix (inset image in Figure 3b). When the sample is exposed to fire, the fusion of the aromatic rings leads to carbonaceous char barrier formation (inset images in Figure 3c,d) on the surface of the LCT‐2@BCF composite (Figure 3c,d).…”

Section: Resultsmentioning

confidence: 99%

Liquid Crystalline Thermosetting Composites‐Based Triboelectric Nanogenerators with Intrinsic Flame Retardancy

Qadeer

Guan

Guo

et al. 2022

Adv Materials Technologies

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Triboelectric nanogenerators (TENGs) have drawn essential interest as highly sensitive sensors that can function efficiently in harsh conditions, which can be life‐saving but challenging to accomplish. Herein, this work explores carbon fiber (CF)‐reinforced liquid crystalline thermosetting (LCT) triboelectric composites as flame retardant triboelectric nanogenerators (FR‐TENGs). FR‐TENGs with controlled structural and chemical properties exhibit not only outstanding flame resistance but also excellent triboelectric performance and can be utilized in the oil drilling industry and space applications under extreme temperatures. This FR‐TENG is incombustible even after 60 s of trying, where most traditional triboelectric materials were burnt completely under similar conditions. The self‐powered FR‐TENG exhibits high thermal resistance and strong mechanical strength and generates Voc (125.7 V), Qsc (14 nC), and Isc (0.8 µA) as electrical performances. In addition, the developed carbon fiber reinforced liquid crystalline thermosetting (LCT‐2@BCF) composite also poses a shape memory effect (SME), which can be employed for early fire alarm sensors. This work manifests the bright prospect of applying CF/LCT composites in fields that require light weight, high strength, high temperature resistance, and flame retardancy.

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Section: Resultsmentioning

confidence: 99%

Liquid Crystalline Thermosetting Composites‐Based Triboelectric Nanogenerators with Intrinsic Flame Retardancy

Qadeer

Guan

Guo

et al. 2022

Adv Materials Technologies

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“…Synthesis and Characterization of RLCP and Cured RLCP. In our previous research, six monomers were used to prepare a curable liquid crystalline oligomer with excellent thermal resistance, 36 but they could not be reprocessed. To make a breakthrough in developing polymers with reprocessability, triple-shape-memory behavior, and high thermal resistance, herein, we used seven all-aromatic monomers to facilely synthesize a new phenylethynylterminated liquid crystalline polyester amide oligomer (RLCP) through a one-pot melt condensation.…”

Section: Resultsmentioning

confidence: 99%

Reprocessable Triple-Shape-Memory Liquid Crystalline Polyester Amide with Ultrahigh Thermal Resistance

Tang

Yuan

Liang

et al. 2020

Ind. Eng. Chem. Res.

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It is still an enormous challenge to develop reprocessable polymers with ultrahigh thermal resistance and multiple-shape-memory behavior through a facile strategy. Herein, a new phenylethynyl-terminated all-aromatic liquid crystalline polyester amide (RLCP) with good processability was synthesized using six all-aromatic monomers and 4,4′-diacetamido-diphenyl sulfide as reactants and then a unique thermosetting liquid crystalline polymer (cured RLCP) with high thermal resistance and versatility was prepared through curing RLCP. Cured RLCP not only shows reprocessability and triple-shape-memory behavior but also has ultrahigh thermal resistance. Its initial thermal decomposition temperature (T di = 457.1 °C) and glass-transition temperature (T g = 224, 340 °C) are the highest among all reprocessable thermosetting polymers containing S–S bonds reported so far. The reversible dynamic exchange of S–S bonds and double-glass-transition behavior are the key reasons that endow cured RLCP with good reprocessability and triple-shape-memory behavior.

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“…This causes the material to absorb water, resulting in a deterioration of the dielectric properties. Tang et al [ 13 ] synthesized phenylethynyl‐terminated liquid crystal polyesters and prepared LCP foams using byproduct acetic acid as a foaming agent, the cell size of the samples prepared by this method had different shapes and uneven sizes, and it was difficult to control the cell structure by this method. Brian G. et al [ 14 ] synthesized liquid crystal polymers with different branched structures by using AB‐type monomers and branching agents, and the LCP foams with cell sizes of 200–400 μm were prepared using the method of heating up foaming, which has a long saturation time and relatively low efficiency.…”

Section: Introductionmentioning

confidence: 99%

Structural Regulation of Microcellular Thermotropic Liquid Crystalline Polymer with Low‐Dielectric Properties During Supercritical Fluid Foaming Process

Zhao,

Chen,

et al. 2024

Adv Eng Mater

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The rapid development of wireless communication technology is increasing the requirements for 5G electronic devices, especially the lining materials for RF (radio frequency) components. Thermotropic liquid crystal polyester (TLCP) with microcellular structure attracts attention due to its excellent performance. However, in 5G applications, the uniformity and controllability of the cellular morphology is very important, as it directly affects the quality and performance stability of TLCP foams. Accordingly, in this paper, the melting behavior and rheological behavior of TLCP were investigated, and the supercritical fluid foaming behavior of TLCP in the isotropic state was studied. The TLCP foams were prepared by a one‐step rapid depressurization foaming method at different temperature and pressure, with cell diameter in the range of 67.5‐283.9 μm and the material density in the range of 0.37‐0.25 g/cm3. In order to broaden the distribution of cell diameter and the density of TLCP foams, the mixture foaming agent of N2 and CO2 was used in foaming process. The TLCP foaming material with a cell diameter of 40.5 μm was obtained with pure N2 at 330 °C and 10 MPa. When the N2 to CO2 partial pressure ratio was 3:7, the maximum cell diameter was 139.2 μm at the same temperature and pressure. When mixture foaming agents were used, the cell diameter was widened to the range of 40.5‐283.9 μm, and the material density was widened to the range of 0.70‐0.25 g/cm3, which realized the controllable preparation of cell diameter and material density of TLCP. The dielectric constant and dielectric loss of TLCP foams can be as low as 1.35 and 0.85‰ at 10 GHz, respectively. The structural regulation of low‐dielectric TLCP microcellular materials was achieved for the first time by way of varying the temperature, pressure, and co‐blowing agent ratio.This article is protected by copyright. All rights reserved.

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Facile strategy and mechanism of preparing high performance intrinsic flame retarding foams based on reactive end-capped liquid crystalline all-aromatic polyester without incorporating additional flame retardants

Cited by 10 publications

References 39 publications

Liquid Crystalline Thermosetting Composites‐Based Triboelectric Nanogenerators with Intrinsic Flame Retardancy

Liquid Crystalline Thermosetting Composites‐Based Triboelectric Nanogenerators with Intrinsic Flame Retardancy

Reprocessable Triple-Shape-Memory Liquid Crystalline Polyester Amide with Ultrahigh Thermal Resistance

Structural Regulation of Microcellular Thermotropic Liquid Crystalline Polymer with Low‐Dielectric Properties During Supercritical Fluid Foaming Process

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