Article
Materials Science, Characterization & Testing
N. Lorenz, M. Mueller-Pabel, J. Gerritzen, J. Muller, B. Groeger, D. Schneider, K. Fischer, M. Gude, Ch Hopmann
Summary: A fast crosslinking reaction is crucial for the economical production of automotive components in liquid composite molding processes. This study provides comprehensive results on the characterization of thermo-mechanical properties, pressure dependent reaction kinetics and shrinkage of fast curing epoxy resins, which give important advice for improved process modeling and facilitate prioritisation for future characterization of such resins.
Article
Agricultural Engineering
Maoping Lyu, Xiangyu Yang, Jing Li, Fei Xie, Hebo Shi, Xinhu Gong, Xusheng Huang, Dandi Fang, Chaoqun Zhang
Summary: Developing novel multifunctional polymeric materials from biomass to replace traditional electric encapsulation materials is significant for energy consumption and sustainable development. This study prepared bio-based epoxy thermosets from different epoxidized plant oils and investigated their properties and structure. Among them, soybean oil-based thermoset showed superior performance and was identified as a suitable candidate for encapsulation materials.
INDUSTRIAL CROPS AND PRODUCTS
(2024)
Article
Materials Science, Multidisciplinary
Li Li, Hui Xi, Jing Yang, Ting Xiao, Rui Zuo, Xueqing Xu, Yaoxia Yang, Zhiwang Yang, Ziqiang Lei
Summary: Poly-amidoamine (PAMAM) dendrimer flame retardants of different generations were synthesized and utilized as a curing agent and a flame retardant for the fabrication of high-purity epoxy resin (EP) materials. The results demonstrated that the EP/PAMAM thermosets exhibited enhanced thermal stability, fire safety, and flexural capacity compared to pure EP.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Sigita Grauzeliene, Aukse Navaruckiene, Edvinas Skliutas, Mangirdas Malinauskas, Angels Serra, Jolita Ostrauskaite
Summary: This study focuses on enhancing the performance of thermosets by combining photo- and thermal polymerization, using renewable resources instead of petroleum-based materials. By studying thiol-epoxy reactions and examining rheological properties, the most suitable formulations for laser direct writing were selected. The dual cured thermosets showed higher rigidity, tensile strength, and thermal stability, demonstrating their potential for high-resolution 3D printing.
Article
Engineering, Chemical
Zhigang Yuan, Lei Wang, Caizhao Liu, Xugang Zhang, Mingming Sun, Bin Zhang, Mehdi Derradji, Jianhui Li, Caiyu Song, Bo Liu
Summary: A novel biobased allyl compound with Schiff-based structure (MPAM) was developed to improve the toughness and thermal properties of 4,4'-bismaleimidodiphenylmethane (BDM). BDM/DBA-MPAM blend resins (BD-MPAM resins) were prepared and the effects of MPAM content on the curing behavior, thermal and mechanical properties were discussed. The modified resins showed improved thermal stability and enhanced flexural strength and modulus compared to BD resin. The impact strength of BD-10 wt% MPAM was the highest.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Polymer Science
Lucie Zarybnicka, Jana Machotova, Radka Kopecka, Radek Sevcik, Martina Hudakova, Jaroslav Pokorny, Jiri Sal
Summary: The use of HCACTP and DTCATP as curing agents for epoxy resins significantly improves flame resistance, with lower total heat release and total smoke production. Among the two derivatives, HCACTP provides better flame resistance properties.
Article
Chemistry, Applied
Lorenzo Pezzana, Giuseppe Melilli, Pierre Delliere, Dumitru Moraru, Nathanael Guigo, Nicolas Sbirrazzuoli, Marco Sangermano
Summary: This study focuses on the development of UV-curable coatings using biomass feedstocks as a replacement for fossil-based materials. By modifying furan derivatives, two bio-based monomers were designed and combined with thiol compounds for UV-curing. The resulting bio-based thermosets exhibited comparable properties to previously studied materials, indicating their potential for coating applications.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Polymer Science
Xiao Zhong, Xutong Yang, Kunpeng Ruan, Junliang Zhang, Haitian Zhang, Junwei Gu
Summary: The integration of intrinsic thermal conductivity and intrinsic flame retardancy in epoxy resins, such as D-LCERDP, offers wider application prospects in the electrical and electronics industries, with improved thermal conductivity coefficients and flame retardancy properties compared to conventional epoxy resins like E-51.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Polymer Science
Lorenzo Pezzana, Raffael Wolff, Giuseppe Melilli, Nathanael Guigo, Nicolas Sbirrazzuoli, Jurgen Stampfl, Robert Liska, Marco Sangermano
Summary: The introduction of Hot Lithography has opened up new possibilities for high viscous formulations in additive manufacturing. By increasing the temperature during the 3D printing process, the viscosity of the resin is reduced and higher curing kinetics and degree of conversion can be achieved. This allows for the printing of a wider range of epoxy-based formulations, including those that are not reactive enough at room temperature. Two bio-based epoxy monomers were investigated for their use in Hot Lithography 3D printing, and their performance was compared to a commercial fossil-based resin. The photocuring process and the thermo-mechanical properties of the final thermosets were thoroughly studied, and the potential for printing complex shapes was demonstrated.
Article
Materials Science, Multidisciplinary
Ahmed Al-Qatatsheh, Jitraporn Vongsvivut, Saulius Juodkazis, Nisa V. Salim, Nishar Hameed
Summary: The use of a coordinated silver (I) complex based on solvate ionic liquid in epoxy resins enables unprecedented electrical and thermomechanical properties. The aligned molecular structure achieved through electric field treatment results in high electrical conductivity, excellent energy storage properties, and rapid curing behavior. Quantum mechanics and synchrotron beamline techniques are utilized to optimize and investigate the properties of the system, paving the way for the next generation of thermoset polymers with multifunctional properties.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Polymer Science
Angela Marotta, Noemi Faggio, Cosimo Brondi
Summary: This study investigates the curing mechanism of furan-based epoxy thermosets with methyl nadic anhydride. The curing kinetics were studied using differential scanning calorimetry, revealing that the total heat of reaction and activation energy of the epoxy resin are dependent on the system composition. Isothermal analysis showed that the order of reaction is not only temperature-dependent, but also composition-dependent.
Article
Polymer Science
Jinghui Dong, Xiaoming Sang, Weihao Yin, Xinggang Chen
Summary: New fluorinated epoxy-phthalonitrile resins were prepared and showed improved thermal stability and dielectric properties, making them potentially useful in heat-resistant cables, chemical-resistant linings, electronic components, cladding materials, and weather-resistant films.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Xiongfei Zhang, Tianhui Zhao, Ting Cao, Peiyu Liu, Chuang Ma, Pengyun Li, Dang Huang
Summary: In this study, a high toughness/trimer epoxy resin was synthesized by graft copolymerization using bisphenol A, epichlorohydrin, and isocyanate trimer as raw materials. The resin was cured at room temperature with low molecular weight polyamide 650/isophorone diamine and low molecular weight polyamide 650/triethylene tetramine composite curing systems. The cured products were analyzed using FT-IR, DSC, TG, and mechanical property testing. The results showed that the increase in TETA and IPDA curing agents led to a significant increase in heat release during the curing process of both systems, resulting in shorter curing time and improved controllability. The compressive strength reached its highest value when the ratio of triethylene tetramine to low molecular weight polyamide 650 was 2.86:100, and the specimen showed excellent shape recovery. The elongation at break reached 21.4% when the ratio of TETA to PA650 was 2.86:100.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Nikita A. Bratasyuk, Natalia N. Saprykina, Vjacheslav V. Zuev
Summary: This study investigated the curing kinetics of polyurethane/epoxy compositions filled with fillers that enhance thermal conductivity. It was found that an increase in filler loading level can depress the cationic polymerization of oxirane rings, leading to less ordered networks and decreased mechanical properties. Additionally, thermal conductivity increased proportionally with loading levels in the compositions.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Polymer Science
Ricardo Acosta Ortiz, Alan Isaac Hernandez Jimenez, Aida Esmeralda Garcia Valdez
Summary: This study reports the synthesis of a bio-inspired curing agent TAC and evaluates its performance in two epoxy resins using the epoxy/thiol-ene photopolymerization technique. The results show that TAC can achieve cross-linked co-networks of the polyether-polythioether type, with one epoxy resin displaying higher reactivity, modulus, and thermal stability.
JOURNAL OF POLYMER RESEARCH
(2021)
