High‐temperature stability of a novel phenylethynyl liquid‐crystalline thermoset

Gavrin, Arthur J.; Curts, Christine L.; Douglas, Elliot P.

doi:10.1002/(sici)1099-0518(19991115)37:22<4184::aid-pola18>3.3.co;2-h

Cited by 3 publications

(6 citation statements)

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“…It was reported that the most important factor influencing the thermal stability is the molecular structure rather than phase difference. [26][27][28][29] However, the thermal stability of liquid crystalline thermosets could be affected by network structure 28 and mesogen concentration. 16,30 Although the same LCE6 and DDM were used to preprare LCE6/DDM resin and LCE6/ DDM/CF composite, the molecule of LCE with long lateral substituent was cured with DDM along the long axis of carbon fiber, as is discussed at Figures 2 and 3.…”

Section: Fracture Morphology and Mechanismmentioning

confidence: 99%

“…And also the dense mesogen network keeps molecular chains close to each other, thus allowing recombination of the free radicals. 11,28,39 Therefore, at degradation of the initial part, LCE6/ DDM/CF composite shows higher activation energies than LCE6/DDM resin because of the alignment of LCE6 on carbon fiber surface. Once this orientation of LCE6 on carbon surface is lost (extent of conversion greater than 0.5), the energy appears no significant difference, as the alignment structure caused by carbon fiber is broken, and the E a values of the two systems converge.…”

Section: Activation Energies For Degradationmentioning

confidence: 99%

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Enhancement in the thermal and dynamic mechanical properties of high performance liquid crystalline epoxy composites through uniaxial orientation of mesogenic on carbon fiber

Guo

Liang

et al. 2014

J of Applied Polymer Sci

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In this work, a high performance liquid crystalline epoxy composite was prepared and the effect of the alignment of LCE with long lateral substituent on the carbon fiber surface curing at low temperature on fracture toughness, dynamic mechanical, and thermal properties of liquid crystalline epoxy with lateral substituent (LCE6) was investigated by polarized optical microscopy (POM), wide angle X‐ray diffraction measurements (WAXS), dynamic mechanical analysis (DMA), thermogravimetric (TGA), and scanning electron microscopy (SEM). Curing degree of the composite was observed by FTIR. The experimental results indicate that the fracture toughness, glass transition temperature (Tg), thermal stability, degradation kinetics are associated with the alignment of LCE6 along long axis of carbon fiber. The alignment of LCE6 on carbon fiber surface can increase mesogen network density, which leads to higher fracture toughness, higher thermal stability, increase of the activation energies and higher Tg of the composite. The dynamic mechanical analysis shows that the compoaite possesses extremely higher dynamic storage moduli, which indicates that this LCE6/DDM/CF composite can be a high performance composite. Thus, the compoaite can be a potential candidate for advanced composites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40363.

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Section: Fracture Morphology and Mechanismmentioning

confidence: 99%

Section: Activation Energies For Degradationmentioning

confidence: 99%

Enhancement in the thermal and dynamic mechanical properties of high performance liquid crystalline epoxy composites through uniaxial orientation of mesogenic on carbon fiber

Guo

Liang

et al. 2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

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“…There has been some research into thermal degradation of liquid crystalline materials using TGA [17,22,23]. It is known that generally LCs containing large aromatic repeating units have high thermal stability.…”

Section: Thermal Analysismentioning

confidence: 99%

“…Furthermore, by utilizing a particular curing agent, the kinetics of curing as well as the final liquid crystalline structure of LCEs can be controlled. The use of a tetrafunctional amine, sulfanilamide (SAA) is known to induce a smectic liquid crystalline structure [17]. The amine group of SAA was found to react more quickly than its sulfonamide group.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Thermal Properties of Liquid Crystalline Thermoset containing Rigid-Rod Epoxy

Cho

Lee

Douglas

2006

High Performance Polymers

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4,4 1 -diglycidyloxy-1-methylstilbene (DOMS) and a novel liquid crystalline thermoset, D2A1 which is obtained from the reaction between DOMS and aniline were synthesized. The thermosets have been characterized with cross-polarized optical microscopy, differential scanning calorimetry, thermogravimetric analysis (TGA) and other techniques. D2A1 was smectic at room temperature and turned to nematic at 85 2 C upon heating, then turned isotropic at 135 2 C. Activation energies for decomposition (E d ) using TGA were calculated according to the technique of Flynn-Wall to determine E d as a function of conversion 1 by a weight loss process.

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Study of the Preparation and Properties of Carbon Nano-Tubes Doped TiO<sub>2</sub>/Glass Fiber Reinforced Plastics

Bai

Jiang

Wang

et al. 2014

AMR

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Carbon nanotubes (CNTs) doped TiO2/glass fiber reinforced plastics (GRP) hybrid materials with different TiO2and CNTs contents were prepared by first step sol-gel and then hand lay-up method, using modified CNTs doped tetrabutyl titanate as precursor. The results showed that high TiO2and CNTs contents obtained GRP with high temperature stability and high electrical conductivity, but slowed down the solidification process of epoxy resin to obtain GRP.

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High‐temperature stability of a novel phenylethynyl liquid‐crystalline thermoset

Cited by 3 publications

References 0 publications

Enhancement in the thermal and dynamic mechanical properties of high performance liquid crystalline epoxy composites through uniaxial orientation of mesogenic on carbon fiber

Enhancement in the thermal and dynamic mechanical properties of high performance liquid crystalline epoxy composites through uniaxial orientation of mesogenic on carbon fiber

Synthesis and Thermal Properties of Liquid Crystalline Thermoset containing Rigid-Rod Epoxy

Study of the Preparation and Properties of Carbon Nano-Tubes Doped TiO<sub>2</sub>/Glass Fiber Reinforced Plastics

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