Article
Polymer Science
Anwar Shafe, Collin D. Wick, Andrew J. Peters, Xiyuan Liu, Guoqiang Li
Summary: This paper introduces a method of using polymer informatics to accelerate polymer development. By using computational and data-driven approaches, the molecular structures of specific polymers are described, as well as the fingerprints associated with shape memory properties. Through statistical analysis, this study lays a foundation for discovering new SMPs via machine learning.
Article
Materials Science, Multidisciplinary
Xavier Colin, Justine Delozanne, Gurvan Moreau
Summary: This article discusses the thermal oxidation mechanisms and kinetics of epoxy-diamine networks used in composite matrices reinforced with carbon fibers in the aeronautical field. It presents a new analytical kinetic model and resolves the system of differential equations derived from the oxidation mechanism without simplifying assumptions. The kinetic model considers the relationships between reactive species concentrations and structure/property relationships to predict the consequences of thermal oxidation on thermomechanical properties.
FRONTIERS IN MATERIALS
(2021)
Article
Construction & Building Technology
Blandine Quelennec, Zhibo Duan, Romain Delannoy, Nicolas Gay, Matthieu Briffaut, Vincent Tognetti, Nicolas Delpouve, Laurent Delbreilh, Laure Bredif, Alexis Duthoit, Emmanuel Richaud
Summary: This study describes the changes in gas permeability of epoxy coatings after thermal aging at different temperatures, and its implications for barrier properties in protecting concrete in civil engineering. The results show that with increasing time and aging temperature, epoxy coatings become more permeable, leading to a loss in its barrier properties. The loss of plasticizer was found to have only a moderate impact on barrier and mechanical properties, while thermal oxidation severely damages both barrier and mechanical properties due to chain scissions.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Polymer Science
Xavier Colin, Fatima Essatbi, Justine Delozanne, Gurvan Moreau
Summary: In this study, analytical solutions were obtained for the system of differential equations derived from the closed-loop mechanistic scheme by applying realistic proportionality assumptions. The kinetic model accurately described the thermal oxidation kinetics of epoxy-diamine matrices, and identified accelerated aging conditions representative of cruising flight. Extreme environmental conditions were defined to prevent deformation in the structural degradation state of the materials.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Materials Science, Multidisciplinary
Qi Wang, Bo Zhu, Dang Sheng Su
Summary: An efficient and eco-friendly hydrothermal oxidation process for carbon nanotubes was explored to improve their performance in epoxy matrices. Compared to concentrated nitric acid oxidation, the hydrothermal oxidation method showed better reinforcing ability, indicating its potential to replace polluting methods for fabricating high-performance CNT/epoxy composites.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Materials Science, Composites
Yuxiang Zhang, Chengwei Wu, Wei Zhang, Xue Zeng, Xiao Han
Summary: This study investigates the curing kinetics and tensile properties of magnetocured epoxy adhesive doped with magnetic nanoparticles (MNPs). It is found that the tensile modulus and strength are strongly influenced by the curing degree (CD) and mass fraction of MNPs. The curing reaction process is described using an isoconversional model. The tensile modulus of the adhesive with 15%wt and 30%wt MNPs increases significantly compared to that with 10%wt MNPs when the curing degree is 0.7, but the increase is not obvious at higher curing degrees. The same trend is observed for the tensile strength, with the samples containing 15%wt and 30%wt MNPs showing much higher strength than the one with 10%wt MNPs under 0.7 curing degree. However, the tensile strength decreases with a higher curing degree. Scanning electron microscopy observation reveals different fracture mechanisms depending on the curing degree. Failure occurs in the adhesive region when the curing degree is below 0.9, while failure initiates and propagates at the interface between adhesive and MNPs when the curing degree is above 0.9. Thus, the intrinsic property of the adhesive plays a role in determining tensile properties at lower curing degrees, while the weak interfacial interaction between adhesive and MNPs has a reverse effect at higher curing degrees.
POLYMER COMPOSITES
(2023)
Article
Chemistry, Applied
Christina Kyriakou-Tziamtzi, Antonios Vlachopoulos, Alexandra Zamboulis, Dimitrios N. Bikiaris, Dimitris S. Achilias, Konstantinos Chrissafis
Summary: Bis(oxiran-2-ylmethyl) adipate, synthesized by adipic acid, was blended with 1-(2-aminoethyl) piperazine to investigate its polymerization capability at ambient temperature. The polymerization kinetics of the epoxy-amine system was studied using Differential Scanning Calorimetry measurements. Various experimental techniques were employed to analyze the curing process and determine the optimal curing conditions. The environmentally friendly nature and low-temperature curing cycle of this epoxy thermoset system make it a superior candidate for the manufacturing industry.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Materials Science, Composites
Ji Zhou, Junliang He, Lei Wang, Yuan Wang, Tong Sun, Haoruo Zhang, Zhengguang Heng, Yang Chen, Huawei Zou, Mei Liang
Summary: This study successfully synthesized high-purity polar epoxy resins by improving the interactions between resin molecules and reducing chain motility. The complex process of group changes as a function of temperature was investigated using in-situ IR. The compression properties of the composites made with the newly synthesized resins were significantly improved.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Composites
Chengming Yue, Huigai Li, Weihao Xu, Yan Zhang, Ping Wang, Weibang Lyu, Yuanyuan Li
Summary: Carbon nanotube strips (CNTSs) were used as preforms for developing high performance nanocomposites. CNT/epoxy resin (EP) composite strips with different orientations and densities were prepared by infiltrating EP into CNTS, stretching, and pressing. Tensile strength of composite strips prepared under stretching and pressing was nine times higher than that of pristine CNTSs due to rearrangement of CNTs and proper resin infiltration.
POLYMER COMPOSITES
(2023)
Article
Engineering, Multidisciplinary
Hyeon-Hye Kim, Byung-Joo Kim
Summary: Thermosetting composites are difficult to separate from carbon fibers once cured, posing a significant environmental problem. This study proposed a multi-step thermolysis method to recover clean recycled carbon fiber (r-CF) from thermoset carbon fiber-reinforced plastic (CFRP). The recovery rate was 95% and the tensile strength of the recycled carbon fiber was 80% higher than that of virgin carbon fiber.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Polymer Science
Raphael Olabanji Ogunleye, Sona Rusnakova, Milan Zaludek, Samuel Emebu
Summary: In this study, the effect of ply stacking sequence on the performance of carbon/epoxy laminates under flexural, tensile and impact loading was investigated. The results showed that unidirectional laminates exhibited higher flexural and tensile strength. Symmetric cross-ply laminates had improved flexural and tensile modulus compared to the unsymmetric counterpart. Quasi-isotropic laminates had higher impact resistance than other samples.
Article
Polymer Science
Zhenbo Lan, Jiangang Deng, Zhuolin Xu, Zhu Ye, Yu Nie
Summary: This paper investigates the mechanical properties of a 20% fiber glass reinforced diglycidyl ether of bisphenol A epoxy resin (GF/EP) after high temperature aging. Tensile and flexural stress-strain curves of the composite were measured between 85-145 °C in air. The results show a gradual decrease in tensile and flexural strength with increasing aging temperature. Microscopic analysis reveals separation between the glass fibers (GFs) and the epoxy matrix (EP) as well as evident pullout of the GFs. The degradation of mechanical properties can be attributed to cross-linking and chain scission in the composite's initial molecular structure, oxidation of the EP matrix, and the difference in coefficients of thermal expansion between the GFs and EP matrix.
Article
Engineering, Environmental
Chuan Ma, Daniel Sanchez-Rodriguez, Tohru Kamo
Summary: The study found that high concentrations of oxygen can accelerate the primary decomposition of epoxy resin and shift the oxidation of resin residue to lower temperatures. In air atmosphere, high yields of CO and CO2 were generated and distributed in several stages. Kinetic analysis indicated that the multi-DAEM method can well explain the oxidative pyrolysis behaviors of epoxy resin.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Materials Science, Composites
Chao Luo, Limin Bao, Ye Sun, Hideaki Morikawa
Summary: The present study investigated the influence of internal parameters on the anti-stab performance of a composite material made of Aramid yarn and epoxy resin, using a combination of practical experimentation and simulation. The experiments revealed that the elastic modulus ratio and the tensile strength to shear strength ratio of the yarn, as well as the diameter of the yarn, all had a significant impact on the stab-proof performance of the material.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Polymer Science
Haichao Liu, Ziyang Ding, Yisa Fan, Yang Luo, Yang Yang
Summary: This study investigates the bonding properties of Basalt Fibre Reinforced Polymer (BFRP) to Aluminum Alloy 5052 using different bonding agents. The experimental results show that the Araldite(R) 2012 adhesive exhibits higher breaking strength and better ductility in a 5% NaCl environment.
Article
Materials Science, Characterization & Testing
Eeva Mofakhami, Sylvie Tence-Girault, Jonathan Perrin, Mario Scheel, Laurent Gervat, Cristian Ovalle, Lucien Laiarinandrasana, Bruno Fayolle, Guillaume Miquelard-Garnier
Article
Polymer Science
Octavie Okamba-Diogo, Francois Fernagut, Jean Guilment, Frederique Pery, Bruno Fayolle, Emmanuel Richaud
POLYMER DEGRADATION AND STABILITY
(2020)
Article
Polymer Science
Pierre-Yves Le Gac, Pierre-Antoine Albouy, Bruno Fayolle, Jacques Verdu
Summary: The study investigates the fatigue life of unfilled polychloroprene rubber under different conditions and network structures, revealing that an increase in crosslink density leads to a decrease in fatigue life in unfilled elastomers. A theoretical energetic approach can predict fatigue lifetime in fully relaxing conditions, while an empirical relationship is proposed for non-relaxing conditions to link fatigue life to the crosslink density of rubber.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Mechanics
R. Kadri, M. Nait Abdelaziz, B. Fayolle, M. Ben Hassine, J. F. Witz
Summary: This study examines the impact of aging on mechanical properties of rubber materials, with modifications to the rubber network structure through crosslinking and chain scission mechanisms. A predictive mechanical tool based on an hyperelastic constitutive model coupled with physical-chemical parameters was proposed to estimate mechanical properties. Relevant indicators of damage for crosslinking or chain scission processes, such as elastically active chains concentrations and swelling rate, were introduced as damage parameters in the mechanical modeling, leading to satisfactory predictions of mechanical behavior and stress-strain estimates at break.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Materials Science, Characterization & Testing
Clement Freymond, Alain Guinault, Carole Charbuillet, Bruno Fayolle
Summary: The thermal degradation of post-consumed ABS/HIPS and PP/PE blends from waste electrical and electronic equipment was investigated by multiple extrusions for recycling purposes. The molar mass, melt flow index, and ultimate elongation of the recycled blends were evaluated as a function of extrusion cycles. The results revealed a similar degradation mechanism for both ABS/HIPS and PP/PE blends, with ABS/HIPS exhibiting higher thermomechanical resistance. An innovative embrittlement criterion based on MFI measurements was proposed for the analysis of post-consumed polymer blends.
Article
Polymer Science
Antoine Bardin, Pierre-Yves Le Gac, Pierre-Antoine Albouy, Herve Bindi, Bruno Fayolle
Summary: By tuning the hydrolysis duration of PEBA, specimens with different macromolecular structures were produced. The impact of phase interconnection changes on strain-induced crystallization (SIC) was studied for a given hard phase structure. The correlation between stress and crystallinity induced under strain was highlighted regardless of the number of chain scissions.
Article
Polymer Science
Sabrina Taourit, Pierre-Yves Le Gac, Bruno Fayolle
Summary: In this study, the impact of chain scission on the tensile properties of elastomers was investigated by aging a polyester-based polyurethane in seawater at different temperatures. The results showed that hydrolysis caused chain scission within the polymer network, leading to changes in the tensile properties. During aging, the stress at break decreased gradually, while the strain at break initially increased and then decreased when the crosslink density was below a critical value. The relationships between the average crosslink density and the ultimate properties were proposed based on the experimental findings.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Polymer Science
S. Lottier, S. Tence-Girault, L. Gervat, N. Saintier, G. Miquelard-Garnier, B. Fayolle
Summary: This study systematically investigates for the first time the effect of hydrolysis and oxidation on the fatigue life of Polyamide 6,6 reinforced with 30 wt% glass fibers. It is found that hydrolysis causes chemical changes throughout the sample, while oxidation effects are localized in a near-surface layer. The fatigue life is significantly decreased with ageing in both cases. The decrease in fatigue life for oxidized samples can be explained by the existence of a brittle layer that does not sustain any stress.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Polymer Science
Clement Freymond, Xavier Mackre-Delannoy, Alain Guinault, Carole Charbuillet, Bruno Fayolle
Summary: The accelerated thermal ageing of ABS films was investigated to determine the cause of their ductile/brittle transition during exposure. Chain scission occurring in the SAN phase was found to be the main process responsible for ABS embrittlement.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Materials Science, Multidisciplinary
Gwladys Lesimple, Ilias Iliopoulos, Jean-Baptiste Marijon, Bruno Fayolle
Summary: PEKK is gaining attention for composites in the aeronautical field. This study provides water transport parameters for PEKK in amorphous and semicrystalline states, including water diffusivity and solubility. Comparisons with PEEK suggest that PEKK absorbs more water due to its polarity.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Applied
Caroline Vibert, Bruno Fayolle, Denise Ricard, Anne-Laurence Dupont
Summary: In order to investigate the combined effects of water and oxygen on the degradation of permanent paper in specific climate conditions, accelerated aging experiments were conducted under three different conditions: humid air, humid nitrogen, and dry air. The degradation state of the paper was evaluated using various techniques, revealing that the cellulose scission rate of the Canson (R) permanent paper was reduced compared to the Whatman No. 40 acidic cotton paper used as a reference. This reduction was attributed to a lower acidification and inhibiting acid-catalyzed hydrolysis due to the presence of alkaline reserve.
CARBOHYDRATE POLYMERS
(2023)
Article
Optics
M. Ayad, S. Uenaldi, M. Scius-Bertrand, C. Le Bras, B. Fayolle, L. Berthe
Summary: This study investigates the behavior of Aluminium tape under high strain rate using laser shock. High power laser is used to create laser shock on the tape, and material models are used to simulate the response. The study also examines the effect of adhesive thickness on the transmitted pressure and the location of maximum tensile stress within the tape. It is found that increasing the adhesive thickness can result in the maximum tensile zone appearing close to the front face.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Physical
C. Le Bras, C. Fosse, L. Delbreilh, M. Gervais, M. Ayad, A. Soumaila Sounakoye, L. Berthe, S. Valadon, B. Fayolle
Summary: This study investigates the mechanical behavior of polycarbonate and polydimethylsiloxane (Sylgard184) under laser shock conditions. The results show that Sylgard184 exhibits glassy behavior under laser shock conditions, while polycarbonate does not show significant changes in behavior. Dielectric relaxation spectroscopy (DRS) measurements further characterize the flow behavior of the polymer chains under extreme conditions.
Article
Materials Science, Multidisciplinary
Sylvie Tence-Girault, Jonathan Quibel, Alexis Cherri, Sebastien Roland, Bruno Fayolle, Stephane Bizet, Ilias Iliopoulos
Summary: PEKK, a semicrystalline polymer, is crucial for applications in aerospace, transportation, electronics, and oil & gas industries due to its properties like thermomechanical and chemical stability linked to its crystalline state. This study proposes a methodology to control and quantify the crystalline state of PEKK by analyzing small-angle X-ray scattering, wide-angle X-ray scattering, and differential scanning calorimetry data. The evolution of crystalline forms and total crystallinity with different crystallization temperatures were discussed, and the melting enthalpy of a 100% crystallized PEKK copolymer was estimated.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Polymer Science
Sebastien Roland, Mahdi Moghaddam, Sylvie Tence-Girault, Bruno Fayolle
Summary: The thermo-oxidative behavior and structural changes of PEKK films in solid state were investigated in this study. Long-term aging affects the mechanical properties of PEKK samples, potentially leading to embrittlement and modifications in the crystalline morphology.
POLYMER DEGRADATION AND STABILITY
(2021)
