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
Abolfazl Hemmatian, Meysam Jalali, Hosein Naderpour, Moncef L. Nehdi
Summary: This study presents a computational model for predicting the maximum fiber pull-out force and corresponding bond slip in fiber-reinforced cementitious composites. Through the development and training of an Artificial Neural Network (ANN) model using an extensive experimental database, it was found that the geometric shape of the fibers and the fiber tensile strength have the greatest impact on the outputs.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Polymer Science
Christian Kahl, Julius Bagnucki, Jan-Christoph Zarges
Summary: Hybrid fiber reinforcement, combining glass and regenerated cellulose fibers, is a promising technique due to the complementary properties of the fibers. This study demonstrates the interaction of the two fiber types in a composite through fiber pull-outs. The use of coupling agent and UV light treatment can increase the interfacial shear stress.
Article
Construction & Building Technology
Xuefeng Xu, Sheng'ai Cui, Lilin Xu, Guang Zeng, Xuewei Wang
Summary: The interfacial bonding performance between basalt fiber and cement-based materials with different sizing agents under various curing environments was investigated. The mechanical development of basalt fiber reinforced concrete (BFRC) with different sizing agents was studied. It was found that low temperature significantly deteriorates the bonding properties, and the effect of bonding strength varies with the type of sizing agent used. The type of sizing agent also affects the volume dose of basalt fiber and the formation of the interface transition zone.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Polymer Science
Robert Vardai, Thomas Lummerstorfer, Claudia Pretschuh, Michael Jerabek, Markus Gahleitner, Gabor Faludi, Janos Moczo, Bela Pukanszky
Summary: Polypropylene hybrid composites were prepared using a combination of traditional reinforcements and PET fibers, with improved interfacial adhesion through the use of maleated PP. Impact strength was enhanced by the presence of stiff fibers, particularly PET, with up to 15 kJ m(-2) achievable. Local deformation processes initiated by polymeric fibers contribute to the overall impact resistance, with debonding and pullout of PET fibers facilitating plastic deformation of the matrix polymer. Different reinforcement types and interfacial adhesion influence overall composite properties.
POLYMER INTERNATIONAL
(2021)
Article
Chemistry, Physical
Nuo Xu, Yingze Li, Ting Zheng, Lin Xiao, Yingyi Liu, Shaohua Chen, Dongxing Zhang
Summary: A mussel-inspired nondestructive method was used to introduce carbon nanotubes onto carbon fiber surfaces, improving the mechanical properties of CFRP composites. The modified CF exhibited increased roughness and better wettability with the epoxy matrix, resulting in enhanced tensile strength and interfacial shear strength. This study provides a convenient and environmentally friendly surface treatment approach for improving the mechanical properties of CFRP composites.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Multidisciplinary
Ziwen Zhang, Chong Cheng
Summary: Dynamic covalent polymeric networks (DCPNs) were synthesized using hindered urea bonds and free thiol groups. These materials exhibited enhanced mechanical properties and excellent self-healing performance due to the catalyst-free conversion of dynamic hindered urea bonds to dynamic thiourethane bonds triggered by time or elevated temperature.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Composites
Sujit S. Pawar, Sally A. Hutchinson, Daniel J. Eyckens, Filip Stojcevski, David J. Hayne, Thomas R. Gengenbach, Joselito M. Razal, Luke C. Henderson
Summary: The optimization of fiber-matrix adhesion is a persistent challenge in fiber-based composite materials. In this study, naturally derived terpenes were chemically modified and used as sizing agents to improve the interfacial shear strength between carbon fibers and epoxy resin.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Gyuho Kim, Kyeongeun Song, Martin Byung-Guk Jun, Young Hun Jeong, Tae-Gon Kim, Byung-Kwon Min
Summary: Fiber bending by the cutting tool is a major cause of fiber pull-out during CFRP milling. The shear stress on the polymer matrix between fibers leads to debonding, and the strain energy absorbed by the deformed matrix is released into fiber-matrix debonding, causing fiber pull-out on the machined surface.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Kyeongeun Song, Gyuho Kim, Huitaek Yun, Byung-Kwon Min, Martin Byung-Guk Jun
Summary: Fiber bending during CFRP milling is a significant factor affecting surface quality. This study proposes a method to identify the machining mechanism type through sound analysis. Simulation and experiments verify the influence of chip thickness on fiber bending and cutting force.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Materials Science, Composites
Ke Duan, Li Li, Fei Wang, Sihan Liu, Yujin Hu, Xuelin Wang
Summary: Through molecular dynamics simulation, it was found that there are two different types of interfaces, weak and strong, between carbon nanotubes and epoxy matrices. The load transfer capability at the weak interface is very low, while the strong pull-out interface exhibits higher strength. Additionally, the interfacial shear strength is influenced by the diameter of the carbon nanotubes, but not by their length.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Textiles
Hongming Wu, Dinghong Xu, Ying Zhou, Jianbing Guo, Weidi He, Yong He, Yuan Yi, Shuhao Qin
Summary: In this study, hemp fibers-reinforced polypropylene composite was enhanced and toughened through chemical treatment in a melt-blending process. Various treatments on hemp fibers were conducted, with dodecyl bromide treatment showing the most significant improvement in mechanical properties and thermal stability. A possible reinforcing mechanism involving the reaction between hemp fibers and dodecyl bromide was proposed.
FIBERS AND POLYMERS
(2021)
Article
Materials Science, Multidisciplinary
Yeou-Fong Li, Jia-Yin Hung, Jin-Yuan Syu, Shu-Mei Chang, Wen-Shyong Kuo
Summary: In this study, basalt fiber reinforced concrete (BFRC) was produced by adding original basalt fiber and sizing-removed basalt fiber into normal strength concrete. The test results showed that the strength of sizing-removed BFRC specimens with 10% weight ratio was the highest. The length and weight ratio of the fiber had an impact on the properties of BFRC specimens.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Applied
Umit Tayfun
Summary: In order to overcome compatibility leakage between composite phases, additives' chemical nature needs to be optimized. The surface of basalt fiber (BF) was chemically enriched via biobased epoxy resin sizing and functional silanization process to improve its interfacial adhesion. Surface properties were examined using SEM/EDX and FTIR analyses. Findings showed that surface-modified BF improved the tensile strength and hardness of composites. The results confirmed that enhanced interfacial adhesion led to performance improvements for BF-loaded EPU composites.
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Baowei Qiu, Muxuan Li, Xueqin Zhang, Yang Chen, Shengtai Zhou, Mei Liang, Huawei Zou
Summary: The study focuses on repairing surface defects of carbon fibers and enhancing the interface properties of carbon fiber reinforced polymer composites through a self-driven method using nano-carboxymethyl cellulose (CMC). The CMC gathers at the defects on carbon fibers via polar attraction between multi-functional groups, forming a tight layer of nanofiber membrane. The repair of surface defects and introduction of multi-functional groups synergistically enhance the interface performance of epoxy-based composites.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Polymer Science
Elisabeth Rossegger, Jakob Strasser, Rita Hoeller, Mathias Fleisch, Michael Berer, Sandra Schloegl
Summary: Orthogonal photoreactions provide a unique way to locally and independently control the (thermo)mechanical properties and functionality of polymer networks simply by choice of the wavelength. In this study, a library of acrylate functional coumarin monomers is synthesized and cured by sequence-dependent wavelength orthogonality. Through well-targeted design, acrylate-based and thiol-acrylate resin formulations are prepared, enabling the one-step fabrication of multi-material structures by digital light processing (DLP) 3D printing. By using a dual-wavelength printer, objects comprising soft and stiff domains are printed with a single resin vat. The wavelength selective change in the network structure also allows for local control of the glass transition temperature in the 3D-printed objects. Soft active devices with higher T-g and the local programming of multi shapes are demonstrated.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Carina Dertnig, Gema Guedes de la Cruz, Dmytro Neshchadin, Sandra Schloegl, Thomas Griesser
Summary: While latent catalysts have been used to initiate and control polymerization reactions, their application in dynamic polymer networks is still in its early stages. In this study, a temperature resistant organic phosphate with a photolabile protecting group was synthesized and introduced into a visible light curable thiol-click photopolymer. The resulting network can efficiently form at 451 nm without premature release of the catalyst, and can be spatiotemporally activated at 372 nm for transesterification reactions at elevated temperature. The formed catalyst does not affect the thermal stability of the polymer network and allows bond exchange reactions in selected areas of printed 3D objects.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Yang Li, Usman Shaukat, Sandra Schlogl, Tanlong Xue, Jingfang Li, Jun Nie, Xiaoqun Zhu
Summary: Driven by the demand for low cost and environmentally friendly curing processes, the research on synthesis of visible light absorbing photoinitiators has been significant in the field of photo-polymerization. In this study, a novel synthesis route is introduced to obtain a bifunctional pyrrole-carbazole-based photoinitiator (ECMO), which can initiate free radical polymerization upon visible light exposure. ECMO also acts as a sensitizer for triar-ysulfonium salts, extending their absorption window into the visible light region and showing superior curing performance in cationic polymerization.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
David Reisinger, Matthias Udo Kriehuber, Marcel Bender, Daniel Bautista-Anguis, Bernhard Rieger, Sandra Schloegl
Summary: This article introduces a novel strategy for temporal control of dynamic bond exchange in covalently crosslinked polymer networks using latent transesterification catalysts. The latent catalyst is designed for temperature-mediated release of a strong organic base and offers creep resistance and high bond-exchange rates. The thermally latent base catalyst is easily introduced into common building blocks and is applied in a thiol-ene network for proof of concept. Light-mediated curing is used for 3D-printing functional objects, demonstrating spatially controlled reshaping and welding based on dynamic transesterification.
ADVANCED MATERIALS
(2023)
Article
Engineering, Civil
Mathias Fleisch, Andreas Thalhamer, Gerald Meier, Philipp Arno Franz Huber, Peter Filipp Fuchs, Gerald Pinter, Sandra Schloegl, Michael Berer
Summary: Different designs of mechanical metamaterials with tunable normal-strain shear coupling effect have been demonstrated. These designs have adjustable shear deformation and can be used in soft robotics applications or structures with desired deformation behavior. The modified 2.5D and 3D chiral-based mechanical metamaterials with tunable normal-strain shear coupling effect and near-zero Poisson's Ratios are presented. The designs incorporate additional geometric freedoms to achieve a broad range of shear deformations, compression moduli, and porosities.
ENGINEERING STRUCTURES
(2023)
Article
Polymer Science
M. Azevedo, A. -M Monks, R. C. Kerschbaumer, S. Schloegl, K. Saalwaechter, M. Walluch, G. Consolati, C. Holzer
Summary: In this study, the crosslinking reaction of solid silicone rubber with dicumylperoxide (DCP) was investigated. It was found that the concentration of DCP had limited influence on the molecular dynamics of the network, which was mainly dominated by entanglements. Differences were also observed in the crystallization ability after crosslinking, with higher crosslinking points leading to lower crystallinity and less stable crystallites.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Theresa Grabmayer, Jakob Manhart, Simon Kaiser, Raimund Schaller, Armin Holzner, Sandra Schloegl
Summary: In this study, we propose an efficient curing strategy using multifunctional epoxides to cure carboxylated nitrile butadiene rubber (XNBR). By conducting prevulcanization in the latex phase and postvulcanization during drying, thin films with high tensile strength and good storage stability can be obtained. The results demonstrate that epoxy crosslinking is a promising alternative to sulfur vulcanization for preparing dipped rubber gloves.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Ivan Raguz, Michael Berer, Mathias Fleisch, Clemens Holzer, Joost Brancart, Bram Vanderborght, Sandra Schloegl
Summary: This paper presents a soft dielectric actuator fully produced by fused filament fabrication, which offers the potential for the production of personalized dielectric actuators. The 3D printed prototypes are characterized in terms of the maximum displacement depending on the electrode printing direction. A soft dielectric gripper made of two 3D printed actuators, achieving a maximum displacement of 42%, is developed as a showcase example.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Article
Chemistry, Applied
Daniel Bautista-Anguis, Archim Wolfberger, Michael Rabe, Stanislaw Tomaszczyk, Sandra Schloegl
Summary: In this study, thermo-responsive functional coatings were developed to indirectly detect critical temperatures by metal oxide (MOx) sensors. The coatings released volatile cleavage products at specific temperatures, and the released gases could be successfully monitored by MOx gas sensors. This work paves the way towards functional coatings that can trace critical temperatures and hot spots of sensitive electronic-based systems on large and non-conformal surfaces.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Engineering, Chemical
Florian Wanghofer, Archim Wolfberger, Gernot Oreski, Lukas Neumaier, Sandra Schlogl
Summary: This study aims to develop disbonding concepts for adhesive connections used in PV modules to improve their recyclability and repairability. Stimuli-responsive adhesive connections were achieved by incorporating thermally expandable fillers in a condensation-curing alkoxy-based silicone adhesive. The addition of functional fillers significantly decreased the bond strength of the adhesive layers, but for specific fillers such as thermally expandable microspheres, it increased the bond strength. Temperature cycling tests had no influence on the strength of the adhesive, while damp heat tests resulted in a decrease in bond strength for all samples.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Materials Science, Multidisciplinary
Amir Rezvan, Elham Sharifikolouei, Viktor Soprunyuk, Wilfried Schranz, Juraj Todt, Alice Lassnig, Christoph Gammer, Nikolaus August Sifferlinger, Atacan Asci, Ilya Okulov, Sandra Schlogl, Jozef Keckes, Ziba Najmi, Andrea Cochis, Alessandro Calogero Scalia, Lia Rimondini, Baran Sarac, Juergen Eckert
Summary: The application of highly biocompatible advanced materials leads to fewer complications and more successful medical treatments. This study proposes a new type of metallic glass that can be used as an oral implant material, and it explores the processing methods to improve its specific properties. The results show that the processed material has higher thermomechanical stability and better cytocompatibility.
MATERIALS & DESIGN
(2023)
Article
Polymer Science
David Reisinger, Alexander Hellmayr, Matthias Paris, Michael Haas, Thomas Griesser, Sandra Schloegl
Summary: The covalently cross-linked network structure of vitrimeric polymers can be reorganized through the thermoactivated exchange of covalent bonds. This study demonstrates the use of a photolatent transesterification catalyst to selectively rearrange the network topology in a thiol-ene polymer matrix. The spatially resolved catalyst activation allows for spatial control and reshaping of the 3D-printed polymer structure.
Article
Chemistry, Multidisciplinary
Ines Cazin, Elisabeth Rossegger, Ignazio Roppolo, Marco Sangermano, Petra Granitzer, Klemens Rumpf, Sandra Schloegl
Summary: Additive manufacturing is a promising technique for fabricating customized 3D objects. Interest is growing in using magnetic materials for 3D printing functional devices. In this study, magnetic Fe3O4 nanoparticles were introduced into a dynamic photopolymer network, which allowed for thermo-activated bond exchange reactions and the healing of 3D-printed structures. The magnetically responsive composites showed potential for use in healable soft devices activated by external magnetic fields.
Article
Polymer Science
Elisabeth Rossegger, Usman Shaukat, Khadijeh Moazzen, Mathias Fleisch, Michael Berer, Sandra Schloegl
Summary: The use of photolatent transesterification catalysts allows for local control of dynamic bond exchange reactions. In the non-illuminated state, the polymer network behaves like a permanent crosslinked duromer. Upon light exposure, the catalyst is formed, facilitating topology arrangements below the network's topological freezing temperature.
Article
Computer Science, Interdisciplinary Applications
Andreas Thalhamer, Mathias Fleisch, Clara Schuecker, Peter Filipp Fuchs, Sandra Schlogl, Michael Berer
Summary: A Finite Element simulation-based optimization framework is proposed to create a predefined deformation behavior in metamaterials. The framework includes numerical homogenization, interpolation, and black-box optimization. The framework is tested on tri-antichiral metamaterials, exploring various combinations of optimization objectives and constraints.
ADVANCES IN ENGINEERING SOFTWARE
(2023)
