Article
Materials Science, Composites
Yannick Bloessl, Gergely Hegedus, Gabor Szebenyi, Tamas Tabi, Ralf Schledjewski, Tibor Czigany
Summary: This article explores the use of fiber Bragg grating sensors in resin transfer molding processes for cure monitoring, focusing on the correlation between strain response and the actual cure state of the resin system. By testing different installation approaches and analyzing the strain changes related to sol-gel conversion of the thermoset polymer, the study demonstrates the capability of providing in-situ information of the cure state beyond the gelation point with the most reliable strain response achieved by installing the sensor inside a controllable, capsuled resin volume.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2021)
Article
Materials Science, Composites
Bo Li, Xiaoqian Xu, Dengxun Ren, Zexu Fan, Mingzhen Xu
Summary: In this study, a BA-ph/BPA-PEN composite film was prepared by modifying BA-ph resin with BPA-PEN. The introduction of BPA-PEN facilitated the polymerization reaction of BA-ph resin and directly affected the polymerization reaction of the benzoxazine ring and the cross-linking reaction of the nitrile group. The increase in BPA-PEN content led to the appearance of a phase reversion structure, promoting the improvement of mechanical properties. The system exhibited good thermal performance, with a higher Td5 and char yield compared to the pure BA-ph system.
COMPOSITES COMMUNICATIONS
(2023)
Article
Engineering, Manufacturing
Peiling Kang, Zhibo Jin, Shuangqiao Yang, Qi Wang
Summary: A novel epoxy composite was successfully prepared with partially decrosslinked waste epoxy resin (WEP) powder and graphite nanosheet (GNP) through a facile processing strategy, which exhibited excellent thermal conductivity, electrical conductivity, and electromagnetic shielding efficiency, showing great potential for thermal management and electromagnetic shielding application.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Characterization & Testing
Andrew J. Parsons, Aleksandra Gonciaruk, Xuesen Zeng, Fernando Sarce Thomann, Peter Schubel, Julien Lorrillard, Michael S. Johnson
Summary: This study investigated the use of a certified aerospace resin (RTM 6) for vacuum infusion. By simulating vacuum infusion conditions using thermogravimetric analysis, it was found that full vacuum could be used as long as the temperature was kept below 130 degrees C. Higher temperatures could be used, but with reduced applied vacuum. The pressure-enhanced TGA method can be considered to provide supplemental processing conditions.
Article
Polymer Science
Timofey Kolesnikov, Alexandra M. Orlova, Anna Y. Tsegelskaya, Georgij Cherkaev, Alexander S. Kechekyan, Alexander Buzin, Petr Dmitryakov, Sergey Belousov, Igor G. Abramov, Olga Serushkina, Alexander A. Kuznetsov
Summary: The study synthesized an oligoimide containing both propargyl and phthalonitrile groups, which demonstrated the potential for cross-linking at temperatures between 300-350 degrees Celsius. With good solubility in solvents and low melt viscosity, this compound exhibited excellent thermal and mechanical properties.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Thermodynamics
Wissam Bessa, Ahmed Fouzi Tarchoun, Djalal Trache, Mehdi Derradji
Summary: Microcrystalline cellulose was extracted from Arundo donax L. and functionalized with amine groups to reinforce bisphenol A aniline based benzoxazine. The incorporation of amino-functionalized MCC led to a decrease in activation energy and preexponential factor of the cure process. The systems studied followed an Avrami-Erofeev reaction mechanism, indicating autocatalytic polymerization behavior.
THERMOCHIMICA ACTA
(2021)
Article
Polymer Science
Gabriele Voto, Leela Sequeira, Alexandros A. Skordos
Summary: This study introduces a cure kinetics methodology for tailoring initial matrix formulations focusing on matrix constituents reactivity. The method has been validated on a wide range of epoxy/amine formulations, allowing the design of customized matrix systems with specific reactivity and cure time.
Article
Materials Science, Composites
Qiheng Tang, Miao Zou, Shuangyong Wang, Lu Fang, Wenjing Guo
Summary: This study presents a method to manufacture high-performance wood fiber-reinforced composites with high mechanical properties, water stability, and aging resistance. By utilizing hot-pressing and resin curing reaction, the wood fibers are reinforced, resulting in composites with superior performance.
POLYMER COMPOSITES
(2021)
Article
Engineering, Manufacturing
Kaiyue Deng, Chunyan Zhang, Xiangyang Dong, Kun Kelvin Fu
Summary: A novel thermoset prepreg fabrication strategy utilizing viscosity controlled by thermal gradient and gravity is proposed in this paper, achieving fast and energy-efficient manufacturing of thermoset prepreg to address current challenges in prepreg manufacturing.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Arinola Isa Olamilekan, Hyeonuk Yeo
Summary: A new type of liquid crystal epoxy resin was synthesized with double mesogenic structures connected by aliphatic spacers, enhancing its self-assembling properties and achieving remarkably high thermal conductivity.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Engineering, Manufacturing
Hafezeh Nabipour, Shuilai Qiu, Xin Wang, Lei Song, Yuan Hu
Summary: Adenine was used as an efficient adsorbent to prepare a bio-based metal-organic framework (bioMOF), which was further utilized as flame retardant additives to enhance the fire safety of polymers. The study demonstrated improved char yield, flame resistance, and mechanical properties of the composites.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Engineering, Multidisciplinary
Jong-Ho Back, Chiwon Hwang, Dooyoung Baek, Dongwoo Kim, Youngchang Yu, Wonjoo Lee, Hyun-Joong Kim
Summary: This study investigates epoxy composites with tunable mechanical properties, including toughened polymers, elastomers, and pressure-sensitive adhesives, by adjusting the ratio of different types of epoxy resins. The results show that these epoxy composites can be used in structural adhesives and flexible electronics, exhibiting performance comparable to traditional tapes.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Engineering, Manufacturing
Xiao-Hui Shi, Shi-Jie Wu, Wei-Min Xie, Xue-Lin Li, Qing-Yun Liu, Jimena De La Vega, De-Yi Wang
Summary: A hybrid architecture (LDH@PZE-Fe) was synthesized for flame retardant epoxy resin through intercalation by surfactant and interfacial modification by ferric decorated and amino groups-containing polyphosphazene (PZE). The introduction of 2.5 wt% LDH@PZE-Fe enabled the EP/LDH@PZE-Fe composite to achieve UL-94 V-0 rating with a LOI value of 27.5%. The superior flame retardancy of EP/LDH@PZE-Fe was attributed to its combined action in both condensed and gaseous phases. Additionally, EP/LDH@PZE-Fe showed satisfactory impact strength and enhanced glass transition temperature due to good compatibility with EP matrix.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Polymer Science
Kohei Takahashi, Kazuki Nagura, Masumi Takamura, Teruya Goto, Tatsuhiro Takahashi
Summary: This study developed an electrically conductive thermosetting resin composite that can transition from liquid to solid state without solvents by adjusting temperature. It has applications as a matrix for carbon fiber reinforced plastics and achieves high electrical conductivity through particle size reduction and temperature optimization.
Article
Chemistry, Physical
Hassaan A. Butt, Ilya V. Novikov, Dmitry V. Krasnikov, Artem V. Sulimov, Amit K. Pal, Stanislav A. Evlashin, Anton M. Vorobei, Yaroslav I. Zuev, Dmitry Ostrizhiniy, Dmitry Dzhurinskiy, Yuri A. Popov, Olga O. Parenago, Albert G. Nasibulin
Summary: In this work, pre-consolidated form of single-walled carbon nanotubes (SWCNT) - SWCNT briquettes - are proposed as a material for manufacturing electrically and thermally conductive thermoset nanocomposites. The briquettes provide similar performance to other forms of SWCNTs in the nanocomposites, with low percolation thresholds. Compared to other forms of SWCNTs, the pre-consolidated briquettes have lower cost and better dispersibility, making them suitable for large scale production and small scale laboratories.
Article
Biochemistry & Molecular Biology
Aurica P. Chiriac, Loredana Elena Nita, Alina Diaconu, Maria Bercea, Nita Tudorachi, Daniela Pamfil, Liliana Mititelu-Tartau
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2017)
Article
Thermodynamics
Nita Tudorachi, Aurica P. Chiriac, Loredana E. Nita, Fanica Mustata, Alina Diaconu, Vera Balan, Alina Rusu, Gabriela Lisa
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2018)
Article
Chemistry, Multidisciplinary
N. Tudorachi, F. Mustata
ARABIAN JOURNAL OF CHEMISTRY
(2020)
Article
Materials Science, Multidisciplinary
A. P. Chiriac, A. G. Rusu, A. Diaconu, N. Tudorachi, L. E. Nita, I Neamtu, D. Rusu
MATERIALS CHEMISTRY AND PHYSICS
(2018)
Article
Biochemistry & Molecular Biology
Alina Gabriela Rusu, Aurica P. Chiriac, Loredana Elena Nita, Maria Bercea, Nita Tudorachi, Alina Ghilan, Daniela Pamfil, Daniela Rusu, Florina Daniela Cojocaru
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2019)
Article
Chemistry, Physical
Fanica Mustata, Nita Tudorachi, Mihai Asandulesa, Ioan Bicu
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
(2019)
Article
Pharmacology & Pharmacy
Aurica P. Chiriac, Alina Gabriela Rusu, Loredana Elena Nita, Ana-Maria Macsim, Nita Tudorachi, Irina Rosca, Iuliana Stoica, Daniel Tampu, Magdalena Aflori, Florica Doroftei
Summary: Bio-based compounds are in demand due to environmental advantages over traditional materials. Essential oils serve as alternatives to antibiotics, with PEBSA successfully encapsulating thymol for an antibacterial system.
Article
Biochemistry & Molecular Biology
Loredana Elena Nita, Aurica P. Chiriac, Alina Ghilan, Alina Gabriela Rusu, Nita Tudorachi, Daniel Timpu
Summary: Alginate hydrogels, similar to extracellular matrix, have great potential for cell and tissue regeneration. By crosslinking with phytic acid, the properties and versatility of the hydrogels can be controlled and adjusted.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Polymer Science
Anton Airinei, Mihai Asandulesa, Maria Daniela Stelescu, Nita Tudorachi, Nicusor Fifere, Adrian Bele, Valentina Musteata
Summary: This study investigates the dielectric and sorption properties of flax fiber-reinforced ethylene-propylene-diene monomer (EPDM) composites with different fiber loadings, as well as their behavior after exposure to electron beam irradiation. The results show that increasing levels of flax fiber in the composites lead to higher water uptake.
Article
Chemistry, Applied
Fanica Mustata, Dan Rosu, Cristian-Dragos Varganici, Liliana Rosu, Irina Rosca, Nita Tudorachi
Summary: This paper investigates the preparation, characterization and behavior of a green thermoset material based on epoxidized soybean oil, castor oil maleic anhydride adduct, and methyl nadic anhydride. Different stiffness resins suitable for green thermoset coatings can be obtained by varying the ratio of MNA/COMA crosslinking agents. The crosslinking behavior, evolved gases analysis, thermal decomposition mechanisms, and kinetic parameters were determined using differential scanning calorimetry and a simultaneous TG/FT-IR/MS coupling. The thermodynamic and crosslinking kinetic models were established through multivariate linear regression, and the performance against wood decaying strains was evaluated.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Materials Science, Characterization & Testing
Aurica P. Chiriac, Mihai Asandulesa, Iuliana Stoica, Nita Tudorachi, Alina Gabriela Rusu, Loredana Elena Nita, Vlad Mihai Chiriac, Daniel Timpu
Summary: The evaluation of macromolecular compounds is crucial for understanding their potential uses. This study investigates the physical and chemical characteristics of a specific copolymer and finds a correlation between its structure and properties. The copolymer exhibits good thermal stability, which is attributed to the presence of squaric acid. Additionally, the copolymer's dielectric properties and supramolecular structure are found to be dependent on the content of squaric acid, suggesting potential applications for this new polymer system.
Article
Polymer Science
Alina Ghilan, Loredana Elena Nita, Daniela Pamfil, Natalia Simionescu, Nita Tudorachi, Daniela Rusu, Alina Gabriela Rusu, Maria Bercea, Irina Rosca, Diana Elena Ciolacu, Aurica P. Chiriac
Summary: This study focused on the preparation and characterization of a hydrogel based on natural materials, which showed improved drug release profiles and tissue-mimicking architecture. The use of phytic acid as a crosslinking agent enhanced the biological properties and stability of the hydrogel without toxicity. The hydrogel also demonstrated antibacterial effects and good biocompatibility, making it a potential therapeutic scaffold for skin tissue engineering.
Article
Chemistry, Multidisciplinary
Aurica P. Chiriac, Alina G. Rusu, Nita Tudorachi, Loredana E. Nita, Alina Diaconu, Daniela Rusu, Iordana Neamtu, Mihai Asandulesa, Vlad Mihai Chiriac
REVUE ROUMAINE DE CHIMIE
(2018)
Article
Chemistry, Physical
Raluca Nicoleta Darie-Nita, Cornelia Vasile, Elena Stoleru, Daniela Pamfil, Traian Zaharescu, Liliana Tartau, Nita Tudorachi, Mihai Adrian Brebu, Gina Mihaela Pricope, Raluca Petronela Dumitriu, Karol Leluk
Article
Chemistry, Multidisciplinary
Alina G. Rusu, Alina Diaconu, Nita Tudorachi, Mihai Asandulesa, Loredana E. Nita, Mihaela Cristea, Iordana Neamtu, Aurica P. Chiriac
REVUE ROUMAINE DE CHIMIE
(2017)
Article
Engineering, Multidisciplinary
Keyu Zhu, Xitao Zheng, Jing Peng, Jiaming Sun, Ruilin Huang, Leilei Yan
Summary: This paper discusses the influence of multiple impacts on the compression strength of honeycomb sandwich structures with composite face sheets. It is found that the size of the impactor affects the turning point of the compression strength. Additionally, high impact energy leads to damage in the bottom face sheet and reduces the overall compression strength.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Danqian Wang, Yanfei Yue, Jueshi Qian
Summary: Magnesium Potassium Phosphate Cement (MKPC) as a binder for steel rebars shows improved corrosion resistance when subjected to carbonation, due to the increase in pH and the formation of a more protective oxide film.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Zhibin Li, Wenyu Wang, Pengcheng Xue, Xingyu Wei, Jian Xiong
Summary: This work proposes a design approach and manufacturing method for carbon fiber reinforced plastic (CFRP) corrugated sandwich truncated cones (CSTC) to improve their anti-debonding ability and ensure reliability. The study establishes theoretical models for CSTCs' stiffness and failure modes, which are verified through experiments and finite element analysis (FEA). The research reveals the effect of geometric parameters on failure modes and performs an optimal design for CSTC structures. The findings have significant implications for the design and application of lightweight CSTCs in constructions, such as launch vehicle adapters.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mingyu Zhang, Lei Chu, Jiahua Chen, Fuxun Qi, Xiaoyan Li, Xinliang Chen, Deng-Guang Yu
Summary: This review summarizes the different structures and construction methods of fibrous membranes with asymmetric wettability. It also reviews the biological applications of these membranes and suggests future challenges.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
E. Mofakhami, L. Gervat, B. Fayolle, G. Miquelard-Garnier, C. Ovalle, L. Laiarinandrasana
Summary: This study investigates the effects of fibre concentration on the mechanical response of welded glass-fibre-reinforced polypropylene (GF-PP). Experimental observations reveal a significant reduction in weld ratio, up to 60%, indicating a decreased strength compared to the bulk material. Increasing fibre content in the welded material results in a decrease in stress at break and strain at the maximum stress. The use of DIC technique and X-ray microtomography further confirms the localized strain amplification in the welded zone due to the significant increase in fibre density.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Emad Pourahmadi, Farjad Shadmehri, Rajamohan Ganesan
Summary: This research compares the mechanical properties of laminates manufactured using automated fiber placement and conventional autoclave curing methods. The results show that laminates manufactured using automated fiber placement have a lower interlaminar shear strength compared to laminates reconsolidated using autoclave curing. A finite element simulation method is proposed to quantitatively analyze these differences.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Johnny Jakobsen, Benny Endelt, Fahimeh Shakibapour
Summary: This study proposes a new bolted/pinned joining method for composite applications, which improves load transfer by introducing a patch-type reinforcement. Experimental results demonstrate significant improvements in both static and fatigue load conditions compared to existing methods. Finite element simulations highlight the advantage of this method, as it creates a more efficient load-transferring mechanism through different stress distributions.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Gisele G. Cintra, Janine D. Vieira, Daniel C. T. Cardoso, Thomas Keller
Summary: This paper proposes a novel approach to assess multi-crack behavior in layered fiber-polymer composites. The generated Compliance and R-curves provide useful insights into understanding the multiple delamination process and allow for separate evaluation of strain energy release rate (SERR) for each crack. The developed cohesive zone model successfully simulates the failure process zone of three parallel cracks, showing good agreement between the numerical model and experimental results.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Renil Thomas Kidangan, Sreedhar Unnikrishnakurup, C. Krishnamurthy, Krishnan Balasubramaniam
Summary: The induction heating process can accurately identify fiber orientation and stacking order, making it a valuable tool for large-area inspection and quality control in manufacturing fiber-reinforced composites.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Sungjun Hwang, Yousoo Han, Douglas J. Gardner
Summary: Bleached Kraft pulp, unbleached Kraft pulp, and old corrugated cardboard pulp are suitable for producing cellulose nanofibril suspensions. Spray drying is a fast, simple, cost-effective, and scalable drying method. Spray-dried cellulose nanofibrils can be used as reinforcing materials in polypropylene matrices. The particle size of cellulose nanofibrils affects the material properties.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mehdi Mahdavi, Abbas Zolfaghari
Summary: This study aims to improve the recovery forces of shape memory polymers (SMPs) through material extrusion additive manufacturing. By using glass fiber (GF) as reinforcement and manufacturing multi-layer composite specimens, it was found that PLA with 6.62% GF exhibited the best recovery force, which was further optimized through annealing heat treatment.
COMPOSITES PART B-ENGINEERING
(2024)
Review
Engineering, Multidisciplinary
Xiang Ao, Antonio Vazquez-Lopez, Davide Mocerino, Carlos Gonzalez, De-Yi Wang
Summary: The vulnerability of natural fibers to heat and fire poses a significant challenge for their substitution of traditional fiber reinforcements in composite materials. Natural fiber/polymer composites (NFCs) are regarded as potential candidates for engineering applications due to their environmental friendliness and low-impact sourcing. Thus, appropriate approaches need to be implemented to enhance the fire safety of NFCs. This review summarizes and discusses the latest understanding of flammability and thermal properties of natural fibers, with a special focus on their interaction with polymer matrix in fire behavior. Additionally, the latest developments in flame-retardant approaches for NFCs are reviewed, covering both flame retardancy and fire structural integrity. Finally, future prospects and perspectives on fire safety of NFCs are proposed, providing insights into further advancements of NFCs.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Cheng Wang, Siqi Huo, Guofeng Ye, Bingtao Wang, Zhenghong Guo, Qi Zhang, Pingan Song, Hao Wang, Zhitian Liu
Summary: The demand for multifunctional, transparent epoxy resin with superior dielectric, mechanical, and fire-safety performances is increasing in modern industries. Researchers have developed an epoxidized, phosphaphenanthrene-containing poly(styrene butadiene styrene) (ESD) for advanced fire-safe epoxy resin, which maintains high transparency and improves UV-blocking property. The addition of 10 wt% ESD results in improved mechanical properties, decreased dielectric constant and loss, and outperformance compared to other fire-safe epoxy resins. This research provides an effective method for developing multifunctional flame-retardant epoxy resin.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Bo Pang, Heping Zheng, Zuquan Jin, Dongshuai Hou, Yunsheng Zhang, Xiaoyun Song, Yanan Sun, Zhiyong Liu, Wei She, Lin Yang, Mengyuan Li
Summary: This study develops an internal superhydrophobic material (ISM) using waste denitrification fly ash, which maintains stable hydrophobicity under harsh conditions of use and does not rely on expensive fluor-based surface modifications. The synthesized ISM has excellent matrix strength, strong waterproof properties, and retains superhydrophobicity even at damaged or friction interfaces.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Meirbek Mussatayev, Qiuji Yi, Mark Fitzgerald, Vincent K. Maes, Paul Wilcox, Robert Hughes
Summary: Real-time monitoring of carbon fibre composites during Automated Fibre Placement (AFP) manufacturing remains a challenge for non-destructive evaluation (NDE) techniques. This study designed a directional eddy-current (EC) probe to evaluate the detectability of out-of-plane wrinkles. Experimental evaluations and finite element modeling were conducted to better understand the relationship between eddy-current density and defect detection. The findings suggest that the probe configuration with an asymmetric driver coil and differential pickup coils shows the best capability for wrinkle detection.
COMPOSITES PART B-ENGINEERING
(2024)
