Article
Construction & Building Technology
Gaoshang Ouyang, Lianjie Wu, Chuxiong Ye, Jingsong Wang, Teng Dong
Summary: This study explores the fluidity modification of geopolymer without changing its compositions. By optimizing the oxides molar ratios and studying the influence of silane coupling agent (SCA), it was found that a specific ratio led to the best fluidity and compressive strength. Addition of an appropriate amount of SCA can decrease viscosity and increase fluidity, while excess SCA has negative effects.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Dentistry, Oral Surgery & Medicine
Jerrin Thadathil Varghese, Kiho Cho, Raju, Paul Farrar, Leon Prentice, B. Gangadhara Prusty
Summary: This experimental investigation explores the optimization of silane treatment of surface-modified S-2 Glass fibers in restorative dental composites for improved mechanical performance. The study discovers that the proper concentration of silane can enhance the interfacial adhesion at the fiber-matrix interfaces and improve the mechanical properties of the composites.
Article
Chemistry, Multidisciplinary
Jindong Huang, Hong Chen, Guanglu Zhang, Xiaowei Fan, Juncheng Liu
Summary: The effects of the dosage of silane coupling agent KH-560 on the structure and performance of PI/SiO2 composite film were investigated. The results show that the addition of KH-560 increases the transmittance and thermal stability of the sample but has little effect on its ability to resist ultraviolet radiation.
Article
Dentistry, Oral Surgery & Medicine
Jerrin Thadathil Varghese, Kiho Cho, Raju, Paul Farrar, Leon Prentice, B. Gangadhara Prusty
Summary: This study investigates the effect of silane treatment of S-2 Glass fibres on the fracture toughness and water sorption/solubility behavior of fibre-reinforced flowable dental composites. The influence of epoxy-and methacrylate-based silane coupling agents (SCAs) on the mechanical strength and hydrolytic properties were also studied. The concentration of the selected SCAs on the mechanical and physical properties were investigated as well as the influence of molecular structure and concentration in the interfacial adhesion at the fibre-matrix interfaces.
Article
Construction & Building Technology
Changsen Zhang, Xu Wang, Zhichao Hu, Qisheng Wu, Huajun Zhu, Jinfan Lu
Summary: Adding an appropriate amount of silane coupling agent can improve the toughness and properties of geopolymer, with the best performance achieved at 0.1wt% content. The coupling agent promotes polymerization reaction, but long-term curing weakens geopolymerization reaction, leading to strength decrease.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Materials Science, Textiles
Md. Ibrahim H. Mondal, Md. Khademul Islam, Firoz Ahmed
Summary: Surface finishing of cotton fiber using silane coupling agents significantly improves textile properties such as tensile strength, wear comfortness, moisture absorption and wrinkle recovery, while also enhancing thermal stability and dye penetration, ultimately resulting in increased wear comfortness.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Polymer Science
Yan Han, Xiaoxing Yan
Summary: Fine art coating is created by combining metal filler and water-based coatings for decoration. The use of a coupling agent molecule can significantly improve the dispersion of the metal filler and the mechanical properties of the coating. In this study, a brass powder-water-based acrylic coating was modified using different silane coupling agents, and the effect on optical properties was compared. The findings provide a technical foundation for the application of wood art coatings.
Article
Polymer Science
Hyebeen Choi, Sang-Bum Kim
Summary: In this study, the effect of the silane coupling agent with different functional groups was investigated to improve the mechanical properties of glass fiber-reinforced polyurethane foam used as a cold insulation. The results showed that coupling agents with epoxy, amino, and mercapto functional groups exhibited excellent mechanical strength. This was attributed to the interfacial adhesion and additional cross-linking effects between glass fibers and polyurethane foam, as confirmed by DSC and SEM.
Article
Chemistry, Physical
Lingda Shao, Jinbo Huang, Xuhuang Feng, Zeyu Sun, Yingjie Qiu, Wei Tian, Chengyan Zhu
Summary: In this paper, glass fiber fabric reinforced polyphenylene sulfide composites were prepared by hot pressing. The effects of glass fibre modification and hot pressing temperature on the properties of the composites were investigated. The results showed that the silane coupling agent treatment improved the bonding effect between the glass fiber fabric and polyphenylene sulfide. The mechanical properties of the composites reached their best when the hot pressing temperature was 310 degrees Celsius.
Article
Materials Science, Textiles
Chenkai Zhu, Saihua Li, Xiaoye Cong, Chris Rudd, Xiaoling Liu
Summary: The research revealed that the addition of a suitable amount of coupling agent (<4 wt.%) can enhance the glass transition temperature, tensile, and flexural strengths of recycled carbon fiber reinforced bio-based epoxy composites by promoting cross-linking and curing reactions between the amino groups of the agent and the epoxy matrix, improving the interfacial bonding.
FIBERS AND POLYMERS
(2021)
Article
Materials Science, Composites
Wei Zhu, Hong Xiao, Jian Wang, Xiudong Li
Summary: Epoxy silane coupling agent and amine silane coupling agent have significant effects on the interface properties of carbon-reinforced aluminum laminates, with the best performance observed at a content of 1%.
POLYMER COMPOSITES
(2021)
Article
Nanoscience & Nanotechnology
Yixi Kuai, Feifei Wang, Jun Yang, Zhixin Xu, Hongping Li, Xiaochuan Xu, Yanna Nuli, Jiulin Wang
Summary: This study uses a coupling agent to induce in situ polymerization of VEC monomers on the surface of NCM622 to form a PVEC solid polymer electrolyte layer, which significantly improves the stability and performance of high-voltage Ni-rich cathode materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Polymer Science
Mahmoud Yousry Zaghloul, Moustafa Mahmoud Yousry Zaghloul, Mai Mahmoud Yousry Zaghloul
Summary: Fibre-reinforced polymeric composite materials are increasingly being used in the repair and replacement of metallic materials due to their high stiffness. This study investigates the effects of fibre volume fraction and stress level on the fatigue performance of glass fibre-reinforced polyester (GFRP) composites, and validates prediction models for fatigue life.
Article
Engineering, Electrical & Electronic
Yunpeng Liu, Mingjia Zhang, Hechen Liu, Yu Sun, Wanxian Wang, Jie Liu
Summary: Basalt fibre composite materials have shown good application prospects in electrical equipment, but their reliability can be affected by damp-heat ageing. In this study, three different coupling agents were compared in terms of their effects on the interface, mechanical, and electrical properties of basalt fibre composites after damp-heat ageing. Molecular simulations were conducted to understand the mechanism of damp-heat ageing in the composites. The results indicate that gamma-aminopropyl triethoxy silane (KH-550) and gamma-glycidoxy propyl trimethoxy silane (KH-560) form stronger bonds with the matrix resin, leading to better performance compared to gamma-methacryloxy propyl trimethoxy silane (KH-570). After damp-heat ageing, the KH-550-treated sample showed significant weakening of mechanical and insulation properties due to hydrolysis of amino group defects in the interface, while the interface layer of the KH-560-treated sample remained stable with carbon-oxygen single bonds and methylene groups, resulting in better stability of mechanical and insulating properties. Therefore, KH-560 is considered to be a more suitable coupling agent for basalt fibres in electrical equipment applications.
Article
Materials Science, Multidisciplinary
Chen Zhao, Lijuan Li, Xiaoyang Li, Wuxin Chen, Yongquan Li
Summary: This study investigates the influence of a silane coupling agent on the modified PVA fibers through experimental and molecular dynamics simulations. The results show that the mechanical properties of PVA fiber concrete are significantly improved after modification with the silane coupling agent. Microscopic tests reveal that the modified polymer film acts as a bridging ligament in the interfacial transition zone, effectively preventing crack extension and enhancing the interfacial adhesion between the organic components of the PVA fibers and the cement matrix.
FRONTIERS IN MATERIALS
(2023)
Article
Polymer Science
James L. Thomason, Jose L. Rudeiros-Fernandez
Summary: This paper investigates date palm and coir fibers as potential reinforcement for polypropylene composites, with a focus on the thermal and mechanical degradation. Lower processing temperatures are found to be more favorable for maintaining fiber performance, as thermal degradation can affect mechanical properties.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Materials Science, Multidisciplinary
David Nash, Grant Leishman, Cameron Mackie, Kirsten Dyer, Liu Yang
Summary: The study revealed that splitting the wind turbine leading-edge erosion progression into discrete stages provides a comprehensive understanding of the changes in the erosion mechanism, particularly with notable changes observed at Stages 2 and 4.
Article
Materials Science, Composites
James L. Thomason, Peter G. Jenkins, Georgios Xypolias
Summary: Careful sample preparation is crucial in ensuring that the results obtained from the microbond test accurately reflect the true material characteristics, and are not influenced by artifacts of preparation techniques. Higher IFSS values were achieved by adjusting the cure schedule and using glass fibers with a full sizing treatment.
COMPOSITE INTERFACES
(2022)
Article
Engineering, Mechanical
Wichain Chailad, Liu Yang, Vince Coveney, Chris Bowen, Alan Bickley
Summary: This study developed a slurry-jet erosion test rig and characterisation procedure for investigating the slurry erosive wear behaviour of elastomeric materials. The results demonstrated excellent control over key parameters and reliable testing of erosion processes, making it possible to evaluate the erosive wear resistance of different elastomers under varied test conditions. The experimental results were compared with theoretical models to validate the findings.
Article
Materials Science, Characterization & Testing
James Thomason
Summary: This paper reviews the potential scaling issues in microbond tests of polymer composites and highlights the differences in structure and properties between microdroplets and macroscale samples.
Article
Materials Science, Multidisciplinary
Grant Leishman, David Nash, Liu Yang, Kirsten Dyer
Summary: By analyzing photographs, microscopy images, mass data, and gloss data, this study found that gloss measurements can effectively quantify changes in coating microstructure as a result of rain erosion. This novel technique is more accurate in representing erosion stages than current industry methods, and can assist wind turbine owners and operators in efficiently managing erosion repairs and future inspections.
Article
Chemistry, Multidisciplinary
Sara T. R. Velasquez, Daseul Jang, Peter Jenkins, Peng Liu, Liu Yang, LaShanda T. J. Korley, Nico Bruns
Summary: Amphiphilic polymer conetworks (APCNs) are polymer networks composed of hydrophilic and hydrophobic chain segments. The mechanical properties of APCNs can be improved by incorporating PBLA peptides, and the secondary structure of the peptide chains can be tailored to enhance toughness and extensibility. This bio-inspired approach paves the way for applications that benefit from significantly increased mechanical properties.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Composites
James L. Thomason, Georgios Xypolias
Summary: The study investigates the effects of environmental ageing on the interfacial shear strength of glass fiber-vinyl ester microbond samples. It reviews and discusses the scale-related issues of estimating water absorption levels in microbond samples and proposes a solution based on Fickian diffusion. The research finds that the interphase strength of microdroplets aged in water at different temperatures varies, with immediate loss observed in higher temperatures. Electron microscope images suggest the development of a bi-phasic microstructure in the aged microdroplets, which is confirmed by DMA analysis on thin films.
COMPOSITE INTERFACES
(2023)
Article
Engineering, Manufacturing
Ross F. Minty, Liu Yang, James L. Thomason
Summary: The paper investigates the impact of epoxy chemistry and testing temperature on the stress-transfer capability of the fibre-matrix interface in a glass fibre reinforced epoxy composite. The interfacial shear strength (IFSS) is found to depend on the hardener-to-resin ratio, testing temperature, and fibre silane coating. The IFSS values decrease with increasing testing temperature, but when the temperature exceeds the glass transition temperature, ratios with excess amine hardener exhibit higher IFSS values. The study suggests that the matrix system's chemistry affects the residual radial compressive stresses at the interface, which relax at higher testing temperatures.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Chemistry, Multidisciplinary
Shima Dayarian, Hojat Majedi Far, Liu Yang
Summary: It is beneficial to synthesize polyimide aerogel powder for its specific applications and potential to reduce cost and cycle time in producing polyimide aerogel monolith. Wet gel grinding and emulsion methods are introduced to prepare polyimide aerogel powders under ambient pressure drying. The fabricated microparticles exhibit thermal stability up to 500 degrees C, with a size range of 7-20 mu m and porosity range of 65-85%, along with desirable microscopic and macroscopic properties.
Article
Engineering, Manufacturing
James L. Thomason
Summary: This paper explores the potential effects of non-circular fiber shapes on the micro-mechanics of stress transfer at the fiber-matrix interface and the resulting changes in composite strength performance. Analytical modelling shows that composites with non-circular fibers have a lower critical fiber length compared to circular fibers with equal cross-sectional area, resulting in significant changes in strength performance. Additionally, non-circularity in fiber cross section can have important consequences for the characterization of interfacial strength using single fiber micromechanical tests.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Chemistry, Applied
Shima Dayarian, Liu Yang, Hojat Majedi Far
Summary: Polyimide aerogels have excellent thermal and mechanical properties. This study developed two alternative techniques using dimethyl sulfoxide solvent and epoxy to consolidate the polyimide aerogel particles into blocks or stock shapes. The techniques significantly reduced the process time and improved the appearance and mechanical properties of the samples made using epoxy. The samples made using dimethyl sulfoxide exhibited higher thermal stability and porosity compared to directly made stock shapes.
JOURNAL OF POROUS MATERIALS
(2023)
Review
Polymer Science
James Thomason, Georgios Xypolias
Summary: The use of glass fiber-reinforced polymer (GFRP) composites in load-carrying constructions has increased significantly in recent decades. Vinyl ester (VE) resins are being increasingly used in these structural composites, and their long-term environmental exposure consequences need better understanding. Testing the environmental durability of new VE-based GFRPs is time-consuming and costly, and accelerated hydrothermal aging is often used. This paper reviews the literature on hydrothermal aging of VE-based GFRP, focusing on moisture-induced aging, voids, and the fiber-matrix interface on composite mechanical performance.
Article
Mechanics
Yang Huang, Qing Xiao, Guillermo Idarraga, Liu Yang, Saishuai Dai, Farhad Abad, Feargal Brennan, Saeid Lotfian
Summary: The use of flexible materials in wave energy converters has attracted attention due to their potential to enhance reliability and conversion efficiency. Existing models for fluid-structure interaction in flexible wave energy converters lack accuracy and general applicability, necessitating a high-fidelity approach. In this study, a computational fluid dynamics and finite element analysis-based framework is developed to provide detailed flow field and structural response information. This tool accurately captures the nonlinear phenomena associated with wave-structure interaction in wave energy converters.
Article
Polymer Science
Stewart J. Taylor, Liu Yang, Ashleigh J. Fletcher
Summary: The role of cation species in the gelation processes of resorcinol-formaldehyde xerogels was investigated. The study found that the composition of the catalyst affected the stability of clusters formed in the system, leading to changes in pore size and distribution of the xerogels.
