Article
Chemistry, Physical
Haiyang Yang, Duxin Li, Jun Yang, Jin Wang, Shunchang Gan
Summary: The study showed that introducing trifluoromethyl into the side chain could improve the heat resistance and hydrophobicity of PAI materials, but may decrease their tensile properties and wear resistance. The appropriate addition amount of trifluoromethyl is 10-30%.
Review
Polymer Science
Younggi Hong, Munju Goh
Summary: This paper reviews the impact of network structure on the thermal properties of epoxy resin (EP) and the feasibility of creating new functionalities by modifying the structure of EP. Liquid crystalline epoxy (LCE) is considered as a promising new material with wide applications in highly thermally conductive composite materials.
Article
Chemistry, Physical
Anna Sienkiewicz, Piotr Czub
Summary: This study investigates the gelation process that may occur during the synthesis of epoxy resin using modified vegetable oil. Theoretical and experimental methods were used to determine the gel point and compare the properties of different reaction systems. The findings show that the reaction mixture transforms into a solid form containing a cross-linked polymer at the critical stage known as the gelation point.
Article
Multidisciplinary Sciences
Guangxin Lv, Chengtian Shen, Naisong Shan, Elynn Jensen, Xiaoru Li, Christopher M. Evans, David G. Cahill
Summary: The rapid development of high-performance computing and high-power electronics has increased the demand for highly thermal conductive polymers. Through studying the thermal conductivity of epoxy resins, the odd-even effects of the ethylene linker length on liquid crystalline order, mass density, and thermal conductivity were discovered. Controlling the linker length is an effective way to design thermally conductive polymers.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Physical
Yujia Hu, Guiyang Yu, Chuanwang Xing, Shanshan Liu, Chuangyu Wei, Heyuan Liu, Jianzhuang Jiang, Xiyou Li
Summary: The semiconductor-based photocatalytic conversion of solar energy using a nanoparticle T-ZnxCd1-xS has shown high efficiency in achieving almost complete conversion of DNDPE to ODA without the need for additional hydrogen source. This method represents a significant improvement over traditional catalytic methods and could open new possibilities for high value-added chemical synthesis.
Article
Polymer Science
Yi-Sheng Lin, Steve Lien-Chung Hsu, Tsung-Han Ho, Li-Cheng Jheng, Yu-Hsiang Hsiao
Summary: Two liquid crystalline epoxy (LCE) resins with different mesogenic lengths were synthesized and cured with two different aromatic diamine curing agents to prepare high performance networks. The spectroscopic structures, nematic and smectic liquid crystalline phases, and curing reactions of the LCE resins were studied, showing that those with long mesogenic groups exhibited superior thermal and mechanical properties compared to commonly used epoxy resins.
JOURNAL OF POLYMER RESEARCH
(2021)
Article
Polymer Science
Ruhe Lian, Xingfeng Lei, Yuyang Xiao, Shuyu Xue, Guo Xiong, Zixiang Zhang, Dong Yan, Qiuyu Zhang
Summary: Colorless polyimide films with outstanding mechanical and thermal properties were fabricated using different diamines and anhydrides, showing high transparency, excellent strength, and heat-resistance. These films have potential applications as substrates in flexible displays.
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
Environmental Sciences
Anila Bello, Yalong Xue, Dhimiter Bello
Summary: Occupational exposure to BADGE-based epoxy resins was studied among construction painters in this research, showing higher concentrations of biomarkers in mid-coat applicators' urine samples. It suggests the need for improvements in hygiene practices and personal protective measures during the application of epoxy-containing paintings.
ENVIRONMENT INTERNATIONAL
(2021)
Article
Polymer Science
Yong-Min Lee, Kwan-Woo Kim, Byung-Joo Kim
Summary: The demand for carbon fiber-reinforced thermosetting plastics is increasing globally, leading to an increase in waste from CFRPs. This study investigated the effect of steam and air pyrolysis on the mechanical properties of recycled carbon fiber from CFRPs. Steam pyrolysis resulted in resin degradation and oxidation of the recycled carbon fiber, leading to a decrease in tensile strength but an increase in interfacial shear strength.
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
Polymer Science
Sungwon Kim, Jin-Hak Yi, Hyemin Hong, Seoung Ik Choi, Dongchan Kim, Min Ook Kim
Summary: This study investigated changes in the interfacial properties of epoxy-coated concrete under different conditions, including epoxy type, coating equipment, and exposure environment and period. The results showed that the measured coating thickness and pull-off bond strength varied depending on the exposure period and conditions. In the real sea environment, the average bond strengths for different additives differed, while the coating method had no significant effect on the measured coating thickness and strength. The study also found that the coating thickness increased under RS conditions, while the exposure conditions had little impact on bond strength.
