Well‐dispersed poly(ether‐ether‐ketone)/multi‐walled carbon nanotubes nanocomposite for harsh environment applications

Abstract“One‐step polymerization method” was used to improve the thermal property of semi‐aromatic poly(ether ether amide) (PEEA). Firstly, a series of difluorobenzamide monomers containing different numbers of methylene were synthesized by the reaction of diamine and 4‐fluorobenzoic chloride using a facile interfacial reaction method. Then, these syntheses were conducted to react with bisphenol AP and 4,4′‐difluorobenzophenon to synthesize the novel poly(aryl ether ketone)/semi‐aromatic poly(ether ether amide) copolymers (PAEK/PEEA) with different chain lengths in the chain through nucleophilic substitution by a one‐step method. The obtained copolymers were amorphous with inherent viscosities of 0.373–0.433 dLg−1. They were found to have high glass transition temperatures (Tg) of 160–191°C, good thermal stability with 5% weight‐loss temperature (T5%) of 409–437°C. The tensile strengths of the copolymers were 65.0–75.8 MPa. The storage modulus were over 0.9 GPa at 120°C. At room temperature, the copolymers were soluble in NMP, slightly soluble in DMF, CH2Cl2, CH3Cl, indicating that the synthesized copolymers could be processed by solution method. The results of optical performance showed that the copolymers had good optical transmittance with the optical transmittance of 75.7%–86.1% at 450 nm. They have the potential to be applied as the novel heat‐resistance optical films as the novel copolymers.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Copolymers of poly(aryl ether ketone)/poly(ether ether amide) containing different numbers of methylene in the main chain: Synthesis and properties

Jiang,

Li,

Dai

et al. 2023

Bond strength and bond mechanism of injection over‐molded woven carbon fiber/PEEK‐short carbon fiber/PEEK composite components

Deng

Huang

Zheng

et al. 2022

A weak interface is formed between injected plastic and substrate during the injection over‐molding process. This study investigated the effects of mold temperature and melt temperature on the bond strength of injection over‐molded components, which were produced by injecting short carbon fiber reinforced polyether‐ether‐ketone (SCF/PEEK) onto the surface of woven carbon fiber reinforced PEEK (WCF/PEEK) laminate substrate. The results show that the interfacial laminar shear strength (ILSS) increases significantly from 15.8 to 50.0 MPa as the mold temperature raises from 190 to 260°C. The ILSS increases first and then decreases with melt temperature raises from 380 to 420°C, achieving a maximum value of 44.4 MPa at 410°C melt temperature. Crystallinity analysis and microscopic observations indicate different bonding modes are formed at the interface. The matrix tangling appears in the matrix enrichment area, interlocking, and tangling appear in the pits and weak tangling and cracks occur on the fiber surface. The mold temperature affects the ILSS by changing the crystallization property and the connection mode in the interface, while the melt temperature affects the ILSS by changing the area of the matrix entanglement. The relationship between the process conditions—interfacial microstructure—interfacial mechanical performance was discussed.

Multi‐walled carbon nanotubes/carbon fiber fabric multiscale hybrid materials for improving the mechanical and tribological properties of phenolic resin composites

Wang

Liu

et al. 2022

Multi‐walled carbon nanotubes (MWCNT)/carbon fiber fabric multiscale hybrid materials were prepared by grafting MWCNT on carbon fabric surface via heating grafted method to improve the mechanical and tribological properties of phenolic resin composites. Field emission scanning electron microscopy, Raman spectrometer, and X‐ray photoelectron spectroscopy were used to analyze the surface properties of carbon fiber. The results shown that the tensile strength of composites modified by 0.15 wt% MWCNT was 38% higher than that of unmodified composites. The wear rates decreased from 3.31 × 10−14 m3 (N·m)−1 for unmodified composites to 0.68 × 10−14 m3 (N·m)−1 for 0.15 wt% MWCNT reinforced composites. The reason was that the uniformly distributed MWCNT could increase interface interaction and mechanical interlocking between carbon fiber fabric and resin matrix.