Effect of thermotropic liquid crystalline poly(ether ketone)arylates on the processibility and properties of poly(ether ether ketone)s fibers

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To improve the processability and properties of the poly(phenylene sulfide) (PPS) fibers at room temperature and high temperatures, a series of composite fibers based on PPS and multiwalled carbon nanotubes were prepared by melt spinning. We researched the processability with a high‐pressure capillary rheometer, and the properties of the composite fibers were investigated in detail by scanning electron microscopy, differential scanning calorimetry, fiber sonic velocity measurement, and single‐fiber strength testing. The results show that the carbon nanotubes (CNTs) had good interfacial adhesion with PPS and dispersed homogeneously in the PPS matrix. When the shear rate was higher than 500 s−1, the oriented CNTs induced the orientation of PPS molecular chains; this resulted in a decline in the apparent viscosity and an increase in the orientation degree of the molecular chains. Meanwhile, the CNTs acted as nucleating agents to effectively improve the crystallization of PPS. The strength of the fibers at room temperature were improved by 28.8% after the addition of 0.2% CNTs, and the initial modulus was also significantly enhanced. The strength retention at 160 °C was promoted from 60.58 to 88.32% with the addition of 1.0% CNTs. The shrinking percentage decreased to almost zero from higher than 15%; this suggested that the CNTs could efficiently improve the dimensional stability at high temperatures. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44609.

X_{c} = \frac{Δ H_{m} + Δ H_{r c}}{w Δ H^{θ}} \times 100 %

Section: Methodsmentioning

confidence: 99%

“…The X c of cooling from DSC testing was calculated according to the following equation:

X_{c} = \frac{Δ H_{c}}{w Δ H^{θ}} \times 100 %

where Δ H c is the crystallization enthalpy of the sample.…”

Section: Methodsmentioning

confidence: 99%

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Processing, structure, and properties of multiwalled carbon nanotube–poly(phenylene sulfide) composite fibers

Zeng

Mou

Qiao

et al. 2016

Self Cite

“…The viscosity of the melt can also be reduced through the addition of compatible plasticizers, such as thermotropic liquid crystalline polymers and macrocyclic compounds, and thereby reduce the required processing temperatures. For example, addition of thermotropic liquid crystalline poly(ether ketone)acrylates to PEEK reduced the melt viscosity and allowed the polymer to be processed at 365°, which is lower than the required temperature for neat PEEK (380°) . Similarly, temporary fourfold reduction of viscosity for PEEK was achieved by melt blending with macrocyclic aromatic thioetherketones .…”

Section: Mechanical Properties Of Paek‐carbon Fiber Compositesmentioning

confidence: 99%

Next generation high‐performance carbon fiber thermoplastic composites based on polyaryletherketones

Veazey

Hsu²,

Gomez

2016

Interest in carbon fiber reinforced composites based on polyaryl ether ketones (PAEKs) continues to grow, and is driven by their increasing use as metal replacement materials in high temperature, high-performance applications. Though these materials have seen widespread use in oil, gas, aerospace, medical and transportation industries, applications are currently limited by the thermal and mechanical properties of available PAEK polymer chemistries and their carbon fiber composites as well as interfacial bonding with carbon fiber surfaces. This article reviews the state of the art of PAEK polymer chemistries, mechanical properties of their carbon fiber reinforced composites, and interfacial engineering techniques used to improve the fiber-matrix interfacial bond strength. We also propose a roadmap to develop the next generation of high-performance long fiber thermoplastic composites based on PAEKs.

“…This is because Vectra has poor compatibility with PEEK. Our previous works have reported two modification strategies to modify TLCPs for improving the compatibility between PEEK and TLCP . However, the synthesized TLCPs and PEEK are just partially compatible, so they are not highly effective processing agent for PEEK.…”

Section: Introductionmentioning

confidence: 99%

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

Zeng

Chen

et al. 2016

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A series of thermotropic liquid crystalline poly(ether ether ketone) arylates (PEEKARs) were synthesized by combining the synthetic oligomeric poly(ether ether ketone) with terminal acetoxyls (PEEK-A) and oligomeric Polyester with terminal carboxyl (PES-C). The structures of the synthesized monomers and oligomerics were characterized by Fourier transform infrared spectroscopy and 1 H Nuclear magnetic resonance spectroscopy, which indicated that the products were successfully synthesized as designed, and three kinds of PEEKARs with different legend of polyester segments were synthesized. The morphologies and properties of PEEKARs were measured by differential scanning calorimetry, wide-angle X-ray diffraction, thermal gravimetric analysis and polarized optional microscopy. The results show that PEEKAR with the minimum polyester segments has the best crystallization properties, but the flowability of which is rather poor and the liquid crystal character is unobvious; meanwhile, PEEKAR with more polyester segments can form a thermotropic liquid crystal intermediate state, and PEEKAR with maximum polyester segments has a somewhat humble crystallization property; as the content of polyester segments increases, the crystal form of PEEKARs changes and the char yields at 600 8C is reduced.