Article
Materials Science, Characterization & Testing
Xukang Wang, Wei Jiang, Qiang He, Cheng Chen, Muhan Zhang, Zhigao Huang, Huamin Zhou
Summary: The interlaminar properties of carbon fiber reinforced thermoplastic composites were significantly enhanced by introducing polyether ether ketone (PEEK) films decorated with carbon nanotubes (CNT) into the interlayer. The films with a CNT surface density of 45 mg/m2 exhibited superior tensile strength and modulus due to higher crystallinity. The introduction of this modified film into CF reinforced PEEK laminates increased interlaminar fracture toughness by 101% to 1.67 kJ/m2 without affecting interlaminar shear strength.
Article
Polymer Science
Muhammad Muslim Rehman, Khubab Shaker, Yasir Nawab
Summary: This study found that adding PEEK particles to carbon/epoxy composites can significantly improve their resistance to delamination and interlaminar fracture toughness, but may cause a decrease in flexural modulus. In addition, the addition of PEEK particles can also enhance the matrix-dominated properties.
INTERNATIONAL JOURNAL OF POLYMER SCIENCE
(2022)
Article
Materials Science, Composites
Dong Quan, Han Chen, Long Qin, Jun Lin, Guiwei Dong, Guoqun Zhao
Summary: The investigation of advanced joining techniques for aerospace composites is crucial for ensuring aviation safety and improving production efficiency. This study focuses on using plain-woven PEEK and PPS meshes as joining agents for an aerospace carbon fibre/epoxy laminate through a co-cure process. An atmospheric plasma treatment is applied to the meshes to enhance the chemical bonds and interactions between the meshes and the composite during the co-curing stage. The results show that the joints formed using the plain-woven PEEK/PPS meshes exhibit excellent fracture resistance, especially those cured with PEEK.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Sangyoung Yoon, Guenil Kim, Andreas Schiffer, Wesley J. Cantwell, Eunho Kim, Tae-Yeon Kim
Summary: In this study, a non-destructive evaluation technique using highly nonlinear solitary waves (HNSWs) was experimentally investigated for detecting defects in AS4/PEEK fiber-reinforced thermoplastic composites. The characteristics of reflected HNSWs were analyzed to examine the influence of defects and their locations in the material. The experimental results demonstrate the capability of the proposed HNSW-based NDE scheme to identify defects in AS4/PEEK laminated composites.
COMPOSITE STRUCTURES
(2022)
Article
Polymer Science
Pavel Kosmachev, Vladislav O. Alexenko, Svetlana A. Bochkareva, Sergey Panin
Summary: In this study, laminated composites based on PEEK and PI matrices were compared in terms of mechanical properties and fracture surface analysis. The composites with unidirectional CF layout exhibited the maximum mechanical properties, and the PEEK-based composites showed higher flexural strength and modulus than the PI-based ones. The differences were attributed to the melt flowability of the polymer matrices and the interlayer adhesion levels.
Article
Materials Science, Composites
Weitao Wang, Boshi Yu, Yiwei Zhang, Mao Peng
Summary: Poly(p-aminophenylene aminoterephthalamide) ((NH2)(2)-PPTA), a new organo-soluble fully aminated rigid-rod aramid, has been synthesized and used as a modifier for epoxy resin (EP) and carbon fiber (CF)/EP composites. It shows excellent solubility and reactivity, and significantly improves the mechanical properties of EP and CF/EP composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Nekoda van de Werken, Pratik Koirala, Jafar Ghorbani, Derek Doyle, Mehran Tehrani
Summary: This study investigates the use of hot isostatic pressing (HIP) to post-process additively manufactured continuous carbon fiber reinforced polyetheretherketone (PEEK) composites to improve their mechanical properties. The research found that increasing the HIP treatment temperature can reduce void content but excessive crystallinity may decrease the composite properties. The study suggests that HIP is a fast and robust method to enhance the performance of AM composites, while caution should be taken to avoid excessive crystallization during post-processing.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Composites
Dong Quan, Guoqun Zhao, Gennaro Scarselli, Rene Alderliesten
Summary: A novel co-curing process using carbon fibre/PEEK tapes was proposed for bonding carbon fibre/epoxy composites, resulting in significantly improved structure integrity and thermal stability. The co-cured joints exhibited increased lap-shear strengths, extended fatigue life, and enhanced mode-I and mode-II fracture energies compared to joints bonded with traditional aerospace structural adhesives. The failure analysis revealed that plastic deformation, resin breakage, and carbon fibre delamination were the main failure mechanisms of the CF/PEEK bonded joints.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Fatima Ghassan Alabtah, E. Mahdi
Summary: The study found that fiber orientation and type significantly affect the interface bonding between steel and fiber-reinforced composites, with CFRP/steel composite exhibiting the highest toughness in both modes of testing. Among the different fabric orientations for GFRP/Steel, the 0 degrees fabric orientation showed the maximum toughness for modes I and II tests. All steel-composite specimens tested displayed matrix, debonding, fiber breakage, delamination, and fiber kinking through scanning electron microscopy.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
Abd Elmoaty M. Abd Elmoaty, Alaa M. Morsy, Abdelrhman B. Harraz
Summary: Engineered cementitious composites (ECC) is a ductile cement-based composite material reinforced with short randomly distributed fibers. This study aimed to evaluate the mechanical properties of ECC using locally available fiber instead of the expensive and less accessible polyvinyl alcohol (PVA) fiber. Results showed that increasing the fiber volume fraction and water curing enhanced the flexural and tensile strength of ECC. Lightweight fiber hybridization had no impact on compressive strength, while heavyweight fiber hybridization improved it. Hybridization improved both tensile and flexural strength of ECC. The relationship between tensile strength and flexural strength was influenced by the compressive strength.
Article
Polymer Science
Donglu Wei, Yizhuo Gu, Hanrui Zhu, Min Li, Shaokai Wang
Summary: This study investigates the resistance welding of carbon-fiber-reinforced polyetheretherketone (PEEK) composite laminate using different types of stainless steel meshes. The results show that power density plays a crucial role in determining the welding time, heat concentration, and deformation of the laminate. The bonding between the metal mesh and polymer, as well as the size and load-bearing capacity of the metal mesh, also affect the shear strength of the weld.
Article
Engineering, Multidisciplinary
Denizhan Yavas
Summary: This study investigates the influence of temperature and layer height on the mechanical and fracture properties of CF-PEEK composites produced through additive manufacturing. The results reveal pronounced orthotropic mechanical behavior with significant variations in Young's modulus and yield strength across orientations. Increasing temperatures make crack initiation easier, while layer height has a relatively minor impact on initiation toughness. Moreover, fracture energy for crack growth is less sensitive to temperature but depends on layer height.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Manufacturing
Jinxing Sun, Shixiang Yu, James Wade Zhu, Xiaoteng Chen, Jon Binnner, Jiaming Bai
Summary: Inspired by biological materials, this study presents a 3D printing approach for layered ceramics that achieves both high strength and toughness. The resulting composite materials exhibit an excellent combination of high strength, fracture toughness, and work of fracture, attributed to multiple toughening mechanisms.
ADDITIVE MANUFACTURING
(2022)
Article
Energy & Fuels
N. Prabhushankar, N. Balaji, S. Kaliappan
Summary: In this study, the mechanical, wear, fracture toughness, drop load impact, and hydrophobicity behavior of the kevlar/sisal fiber composite laminates with cellulose addition were examined. The results showed that composite designation C3 exhibited the highest improvement in mechanical properties, while composite designation C4 had the lowest wear rate and coefficient of friction. Additionally, the addition of cellulose and the fiber stacking order influenced higher penetration resistance in drop load impact toughness.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Materials Science, Composites
A. P. Arun, S. Kaliappan, L. Natrayan, Pravin P. Patil
Summary: This research aimed to investigate the effects of Artocarpus heterophyllus fruit seed husk biochar and twill weaved bamboo fiber on the mechanical properties and fracture toughness behavior of epoxy-based composites. The results showed that the incorporation of twill weaved bamboo fiber improved the mechanical properties of the composites and enhanced the bonding between the matrix and fibers.
POLYMER COMPOSITES
(2022)
Article
Polymer Science
Shangying Zhang, Qi Wang, Fengna Dai, Yangyang Gu, Guangtao Qian, Chunhai Chen, Youhai Yu
Summary: The study successfully prepared TiNPs/PSF composite microspheres with good ability to degrade methyl blue, and the porosity, density, and photoactivity of the composite microspheres are influenced by the loading amount of TiO2.
Article
Chemistry, Analytical
Chenjie Zhu, Haiquan Chen, Chunhai Chen, Youhai Yu
Summary: The research successfully prepared porous polyamide films using electrostatic spray deposition method for the first time, which improved ion transmission rate by forming porous structure. Introducing silver nanowires also effectively improved the electrochromic response time of the film, resulting in better electrochromic properties.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Polymer Science
Haiquan Chen, Fengna Dai, Mengjie Hu, Chunhai Chen, Guangtao Qian, Youhai Yu
Summary: By investigating the effects of DPABZ and PABZ content on the properties of polyimide films, it was found that DPABZ has the potential to prepare a new generation of flexible display substrates with higher thermal stability and lower coefficient of thermal expansion.
JOURNAL OF POLYMER SCIENCE
(2021)
Article
Environmental Sciences
Shangying Zhang, Fengna Dai, Zhao Ke, Qi Wang, Chunhai Chen, Guangtao Qian, Youhai Yu
Summary: Porous hollow carboxyl-polysulfone (PH-CPSF) microspheres were synthesized through non-solvent-induced phase separation (NIPS) method, showing high adsorption capacity for cationic dyes. The microspheres exhibit a hollow core structure, high surface area, and strong adsorption ability due to inter-molecular interactions.
Article
Chemistry, Physical
Shangying Zhang, Fengna Dai, Qi Wang, Guangtao Qian, Chunhai Chen, Youhai Yu
Summary: Porous hollow polysulfone microspheres were prepared using PEG as a porogen, with the molecular weights of PEG influencing the morphology and porous structure of the microspheres. The study showed that higher Mw of PEG led to increased viscosity and larger microsphere size with reduced porosity. The PHPSF microspheres demonstrated higher separation efficiency and reusability compared to original PSF microspheres, indicating potential for water organic pollution treatment.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Polymer Science
Haiquan Chen, Fengna Dai, Xiaoying Yan, Chunhai Chen, Guangtao Qian, Youhai Yu
Summary: Novel isomeric diamines and derived polyimides with outstanding heat resistance and dimensional stability were successfully synthesized in this study, showing lower CTE compared to traditional PABZ-based PIs. These high-performance PI films with matching CTE of copper have potential applications in flexible display substrates and printed circuit boards.
JOURNAL OF POLYMER RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Fengna Dai, Shangying Zhang, Qi Wang, Haiquan Chen, Chunhai Chen, Guangtao Qian, Youhai Yu
Summary: The novel reduced graphene oxide/TiO2-polyphenylenesulfone (rGO/TiO2-PPSU) hybrid ultrafiltration membrane exhibits efficient visible-light-driven photocatalytic degradation of organic pollutants and superior antifouling properties. Compared to membranes prepared with graphene oxide and TiO2 separately, the rGO/TiO2-PPSU membrane showed significantly improved photodegradation of phenazopyridine hydrochloride solution under UV and visible light.
FRONTIERS IN CHEMISTRY
(2021)
Article
Polymer Science
Haiquan Chen, Fengna Dai, Mengxia Wang, Xiaoying Yan, Zhao Ke, Chunhai Chen, Guangtao Qian, Youhai Yu
Summary: A series of novel spirobisbenzoxazole-based polyimides were synthesized, which exhibited good organic solubility, improved gas permeability, ultra-micropore distribution and high BET surface areas, as well as excellent thermal and mechanical properties. The effects of rotation restriction and thermal annealing process on gas permeation behavior were also studied.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Zhu Chenjie, Chen Haiquan, Yu Youhai
Summary: This study prepared polymer films with multi-level pore structure and excellent electrochromic properties by electrostatic spray technology and in-situ elution method, and found that the film had the best performance when the electrolyte content was 33.3%.
CAILIAO GONGCHENG-JOURNAL OF MATERIALS ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Haiquan Chen, Fengna Dai, Mengxia Wang, Chunhai Chen, Guangtao Qian, Youhai Yu
Summary: The novel diamine DBOA and its derived polyimides exhibit enhanced thermal properties and improved molecular packing, making them ideal for applications in OLED displays due to their high glass transition temperature and low coefficient of thermal expansion.
Article
Chemistry, Multidisciplinary
Qi Wang, Fengna Dai, Shangying Zhang, Mengxia Wang, Chunhai Chen, Youhai Yu
Summary: In this study, zwitterionic nano-silica was used as a filler to prepare a PEN nanocomposite membrane, resulting in significantly improved properties such as porosity, water content, and permeability. The introduction of zwitterionic SiO2 NPs effectively inhibited irreversible fouling and enhanced the antifouling ability of the membrane.
Article
Polymer Science
Haiquan Chen, Fengna Dai, Mengxia Wang, Chunhai Chen, Guangtao Qian, Youhai Yu
Summary: In this study, a pair of isomer diamines containing both benzimidazole and benzoxazole were successfully synthesized and used to prepare homopolyimides. The resulting polyimides exhibited outstanding thermal properties and ideal mechanical properties, making them suitable for flexible display substrate materials in the next generation.
JOURNAL OF POLYMER SCIENCE
(2021)
Article
Polymer Science
Guangtao Qian, Fengna Dai, Haiquan Chen, Mengxia Wang, Mengjie Hu, Chunhai Chen, Youhai Yu
Summary: Three novel diamines were designed and synthesized, leading to the preparation of high-performance poly(benzimidazole-amide-imide) films with high glass transition temperatures and excellent mechanical properties, making them promising candidates for flexible-display substrates.
JOURNAL OF POLYMER SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Guangtao Qian, Fengna Dai, Haiquan Chen, Mengxia Wang, Mengjie Hu, Chunhai Chen, Youhai Yu
Summary: A novel N-phenyl-poly(benzimidazole imide) was successfully synthesized, addressing the issues of high water-absorption and retaining superheat resistance. The resulting polymer had a high glass-transition temperature and increased optical transparency due to its loose molecular packing and noncoplanar structures.
Article
Polymer Science
Mengjie Hu, Haiquan Chen, Mengxia Wang, Gang Liu, Chunhai Chen, Guangtao Qian, Youhai Yu
Summary: Novel low-dielectric PI films were designed with the introduction of fluorene and pyridine ring, exhibiting low-dielectric constant, excellent organic solubility, high tensile strength, and excellent optical transparency. These high-performance films are expected to be applied in the field of microelectronics.
JOURNAL OF POLYMER SCIENCE
(2021)
