Article
Materials Science, Composites
Lorena Saitta, Vishnu Prasad, Claudio Tosto, Neal Murphy, Alojz Ivankovic, Gianluca Cicala, Gennaro Scarselli
Summary: The study focuses on composite fabrication, characterization, and recyclability of biobased polymer resins reinforced with flax fiber. By selecting different biobased resins and evaluating their mechanical properties, an epoxy resin cured with a cleavable hardener is found to have the highest glass transition temperature, ensuring full recyclability. The study also demonstrates the possibility of separating and recovering fibers and resin from composite panels through a specific chemical process.
POLYMER COMPOSITES
(2022)
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
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
Polymer Science
Ying Li, Li Yuan, Guozheng Liang, Aijuan Gu
Summary: A new kind of reprocessable shape memory thermosetting resins (DBE) is developed with enhanced heat resistance and mechanical strength by constructing a crosslinked network based on N,N' -4,4' -diphenylmethane bismaleimide, bisphenol A epoxy resin and 4,4' -dithiodiphenylamine. The DBE resins exhibit multiple phase structures, and 1DBE shows the best integrated performance with high T-g, tensile strength, good reprocessability, and excellent shape memory performance.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Review
Polymer Science
Jingkai Liu, Liyue Zhang, Wuliuyi Shun, Jinyue Dai, Yunyan Peng, Xiaoqing Liu
Summary: Research on traditional thermosetting resins derived from renewable resources is limited, but recent studies indicate the potential of high-performance bio-based epoxy and polybenzoxazine resins for further development.
JOURNAL OF POLYMER SCIENCE
(2021)
Article
Polymer Science
Christoph M. Poehler, Marwa Hamza, Torsten Kolb, Erik V. Bachtiar, Libo Yan, Bohumil Kasal
Summary: This study investigates the fire performance of epoxy and carbon-fiber-reinforced polymer composites with and without fire retardants. The effects of different fire retardants on the oxygen index and heat release of the composites were studied. The results show that the mixture of 70 wt.-% epoxy, 24.6 wt.-% APP, and 5.4 wt.-% MEL has the highest oxygen index and the lowest heat release rate.
Article
Polymer Science
Hiroto Kudo, Shuji Nishioka, Huayi Jin, Hiroyuki Maekawa, Shinya Nakamura, Tomoya Masuda
Summary: This study investigates a new thermal curing system for epoxy resins by examining the ring-opening copolymerization of glycidyl phenyl ether (GPE) and D,L-lactide (LAC). The results suggest that the produced poly(GPE-co-LAC) is a gradient copolymer with improved thermal stability and increased cross-linking density. This new system shows potential for various industrial applications.
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)
Review
Polymer Science
Jingkai Liu, Shuaipeng Wang, Yunyan Peng, Jin Zhu, Weiwei Zhao, Xiaoqing Liu
Summary: The development of sustainable thermosetting resins is a contemporary research objective, requiring renewable feedstocks, comprehensive properties, and recyclability. This systematic overview discusses recent advances in bio-based thermosetting resins, including the application of bio-based platform compounds, synthesis of typical bio-based thermosets, and strategies for recycling waste products.
PROGRESS IN POLYMER SCIENCE
(2021)
Article
Polymer Science
Matthias Sebastian Windberger, Evgenia Dimitriou, Sarah Rendl, Karin Wewerka, Frank Wiesbrock
Summary: This study explores and compares two strategies - compounding with thermally conductive inorganic materials and blending with aromatic units arranged by the principle of pi-pi stacking - to increase the thermal conductivity of epoxy-amine resins. It was found that enhanced thermal conductivity was observed exclusively in DEO-based polymer networks, attributed to the higher flexibility of the aliphatic carbon chain of DEO compared with BADGE.
Article
Materials Science, Multidisciplinary
Xi Yang, Yindong Wang, Xiaokang Zhang, Zhiwen Jian, Xili Lu, Zhanhua Wang, Hesheng Xia
Summary: In this study, acylsemicarbazide (ASC) moieties are introduced into a network to obtain a dynamic reversible cross-linked thermoset epoxy resin. The optimized epoxy resin shows excellent reprocessing performance and can be used to prepare carbon fiber reinforced polymer composites. The study provides a solution for recycling carbon fiber composites in line with a circular economy.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Ya-Shiuan Lee, Wen-Jau Lee, Yi-Chun Chen
Summary: This study investigates the influence of polyurethane resin composition on the reactivity and properties of epoxy resin/polyol/isocyanate blended resin. It is found that the addition of polyurethane resin can improve the toughness of epoxy resin, and different compositions have varying reactivity and properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Engineering, Manufacturing
Eirini Tsiangou, Julian Kupski, Sofia Teixeira de Freitas, Rinze Benedictus, Irene Fernandez Villegas
Summary: This study assessed the sensitivity of ultrasonic welding process for joining different composites, revealing that dissimilar composite welded joints are more sensitive to heating time. However, a relatively wide processing interval could still be obtained when the coupling layer had sufficient thickness.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Review
Engineering, Manufacturing
Manuel B. Arrillaga Tamez, Iman Taha
Summary: The article provides an overview of the technology in the field of additive manufacturing, with a focus on polymeric materials and 3D printing of fiber reinforced polymer composites. It details the advantages and limitations of different processes, and presents common materials, applications, and key players in the industry.
ADDITIVE MANUFACTURING
(2021)
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
Chemistry, Physical
Maria Chiara di Gregorio, Emilia Severoni, Leana Travaglini, Marta Gubitosi, Simona Sennato, Francesco Mura, Carlos Redondo-Gomez, Aida Jover, Nicolae Viorel Pavel, Luciano Galantini
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2018)
Article
Crystallography
Francisco Meijide, Santiago de Frutos, Victor H. Soto, Aida Jover, Julio A. Seijas, Maria Pilar Vazquez-Tato, Francisco Fraga, Jose Vazquez Tato
Article
Crystallography
Francisco Meijide, Maria Pilar Vazquez-Tato, Julio A. Seijas, Santiago de Frutos, Juan Trillo Novo, Victor H. Soto, Jose Vazquez Tato
Article
Chemistry, Physical
Silvia Vazquez-Gomez, M. Pilar Vazquez-Tato, Julio A. Seijas, Francisco Meijide, Santiago de Frutos, Jose Vazquez Tato
JOURNAL OF MOLECULAR LIQUIDS
(2019)
Article
Biochemistry & Molecular Biology
Xesus Feas, M. Pilar Vazquez-Tato, Julio A. Seijas, Anna Pratima G. Nikalje, Francisco Fraga-Lopez
Article
Polymer Science
Francisco Fraga Lopez, Javier Valcarcel, Victor H. Soto, Jose M. Martinez Ageitos, Eugenio Rodriguez, Jose Vazquez Tato
Summary: The epoxy resin diglycidyl ether of Bisphenol A (BADGE n = 0) was cured with a new synthesized hardener (2-adamantylethanamine) and characterized by DSC, showing higher enthalpy of reaction and glass transition temperature values. Activation energies were determined for autocatalytic and then-order mechanisms, with the latter being lower due to steric effects of the adamantyl group hindering ring opening during curing. Selecting the appropriate cross-linking agent can increase T(g) and reduce activation energy, beneficial for certain industrial applications.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Biochemistry & Molecular Biology
M. Pilar Vazquez-Tato, Julio A. Seijas, Francisco Meijide, Francisco Fraga, Santiago de Frutos, Javier Miragaya, Juan Ventura Trillo, Aida Jover, Victor H. Soto, Jose Vazquez Tato
Summary: The lipophilicity of 15 derivatives of sodium cholate was theoretically determined using the Virtual log P method. The relationship between the octan-1-ol/water partition coefficient and the critical micelle concentration (cmc) was established through a double-logarithm relationship. The study also investigated the demicellization of aggregates formed by sodium cholate derivatives with bulky hydrophobic substituents.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Physical
Aida Jover, Francisco Fraga, Francisco Meijide, Jose Vazquez Tato, Jacopo Cautela, Alessandra Del Giudice, Maria Chiara di Gregorio
Summary: Sodium deoxycholate exhibits various self-assembled structures in water, with novel phases and reversible transitions observed under conditions suitable for physiological working environment. These findings enhance the understanding of its diversity and help clarify its role in vivo.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Aida Jover, Jacobo Troncoso, Maria Chiara di Gregorio, Francisco Fraga Lopez
Summary: The thermodynamics of the transition between two supramolecular aggregates of sodium deoxycholate in aqueous solution were characterized in this study. The morphological transition between the two structures was observed using electron microscopy. The results indicated that the transition process was influenced by factors such as temperature, pH, and surfactant concentration.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Biochemistry & Molecular Biology
F. Fraga-Lopez, Lisbeth Jimenez Carrillo, Maria Pilar Vazquez-Tato, Julio A. Seijas, Francisco Meijide, Jose Vazquez Tato, Aida Jover
Summary: The effect of doping the DGEBA/mXDA system with AuNPs was studied using various techniques, including DSC, thermogravimetric analysis, DMA, and DEA. The presence of AuNPs below a certain concentration decreased T-g linearly with the concentration, but above that concentration, T-g remained unaffected. The activation energy values suggested that AuNPs caused some obstacles at the beginning of the crosslinking process.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)