Article
Polymer Science
Chi-Ping Li, Chih-Min Chuang
Summary: The study compared the thermal and dielectric properties of rigid-rod bifunctional epoxy resin and commercial epoxy resin, finding that the rigid-rod structure exhibited better performance with higher 5% weight loss temperature and smaller thermal expansion coefficient than the flexible structure. Additionally, the rigid-rod system demonstrated higher Tg and better dielectric properties when enough curing agent was provided.
Article
Polymer Science
Natalia Gutierrez Perez-de-Eulate, Patricia Ares Elejoste, Garazi Goenaga, Maitane Urrutxua, Francisco Javier Vallejo, Jesus Ballestero, Alexandra Allue, Jose Luis Gomez-Alonso
Summary: Fiber-reinforced polymer composites have advantages such as lightweight, high strength, stiffness, corrosion resistance, and reduced maintenance compared to metallic components. However, fire resistance is a key factor in certain applications. To address this, a UV-curable resin composed of acrylic monomers and flame-retardant fillers was used to manufacture flame-retarded UV-curable composites.
Article
Chemistry, Organic
Guillaume Levitre, Sebastian Keess, Gary A. Molander
Summary: A photoinduced method for aminomethylating cubanes is reported in this study. The reaction conditions are mild and allow for the incorporation of various (hetero)-arylimines with high diastereoselectivity and tolerance toward functional groups.
Article
Chemistry, Inorganic & Nuclear
Abdullah Fahad A. Alshamrani, Orlando Santoro, Timothy J. Prior, Mohammed A. Alamri, Graeme J. Stasiuk, Mark R. J. Elsegood, Carl Redshaw
Summary: The interaction between [Sc(OR)(3)] (R = iPr or triflate) and p-tert-butylcalix[n]arenes (where n = 4, 6, or 8) leads to the formation of intriguing structural motifs. Some of these motifs are relatively non-toxic and capable of ring opening polymerization (ROP) of cyclohexene oxide.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Physical
Weng Nam Lee, Noordini M. Salleh, T. S. Velayutham, Sit-Foon Cheng
Summary: A series of palm-based liquid crystals were synthesized using palm fatty acids and their smectic A phase was confirmed by microscopy, calorimetry, and scattering techniques. The range of the smectic phase was found to be influenced by the length of the flexible alkyl chains, the presence of polar terminal substituents, and the breath to width ratio of the mesogenic core. Dielectric measurements also showed that the dielectric strength was affected by the length of the flexible alkyl chains. Interestingly, these palm-based liquid crystals exhibited superior mesophase range compared to other structurally related compounds.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Engineering, Electrical & Electronic
Eman A. Gaml, A. Z. El-Sonabi, M. A. Diab, H. R. Issa
Summary: Complexes of Cu (II) and Co (II) with a specific ligand have been synthesized and characterized. The alternating current conductivity and dielectric properties of these complexes were investigated, revealing their frequency and temperature-dependent behaviors. Different conduction mechanisms were suggested for different complexes.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Analytical
Nahid Pourreza, Reza Zadeh-Dabbagh
Summary: A new nanosorbent was prepared for the dispersive solid-phase extraction and determination of phthalate esters, showing detection limits ranging from 0.02 to 0.31 μg L-1. The method was applied successfully for the enrichment and determination of phthalate esters in various samples such as mineral water, yogurt, and saline solutions.
ANALYTICAL SCIENCES
(2021)
Article
Engineering, Electrical & Electronic
Adnan Solmaz, Zulfiye Ilter, Ismet Kaya
Summary: Two different Schiff base methacrylate polymers were synthesized, and their thermal behavior, electrical properties, and antimicrobial activities were investigated in this study. The glass-transition temperature, residual amount at 1000 degrees C, and conductivity of the polymers were determined. Additionally, the polymers showed good antibacterial and antifungal properties against specific microorganisms.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Physical
Imen Ketata, Linda Bejaoui, Ameni Brahmia, Rached Ben Hassen
Summary: A new cobalt (III) complex with promising fluorescent and electrical properties was synthesized and characterized, showing high green emission in polar aprotic solvents. The dielectric constant, dielectric loss, and conductivity of the complex were studied as a function of temperature and frequency, with potential implications for electronic and optoelectronic device applications.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Chemistry, Inorganic & Nuclear
Pravat Ghorai, Sougata Ghosh Chowdhury, Kunal Pal, Jayanta Mandal, Parimal Karmakar, Antonio Franconetti, Antonio Frontera, Salvador Blasco, Enrique Garcia-Espana, Partha Pratim Parui, Amrita Saha
Summary: The study focuses on the characteristics of the chemosensor H2DTC, revealing its potential for selective detection of Zn2+ and Cu2+ ions with excellent fluorescence response. The chemosensor exhibits different responses to various ions and is capable of accommodating up to four metal ions in the solid state.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Pravat Ghorai, Sougata Ghosh Chowdhury, Kunal Pal, Jayanta Mandal, Parimal Karmakar, Antonio Franconetti, Antonio Frontera, Salvador Blasco, Enrique Garcia-Espana, Partha Pratim Parui, Amrita Saha
Summary: This study presents a rare example of a macrocyclic chemosensor, H2DTC, based on aza-crown, which selectively detects Zn2+ and Cu2+ in HEPES buffer medium. The chemosensor shows fluorescence response for both ions and exhibits chelation-enhanced fluorescence effect with Zn2+ ions and quenching effect with paramagnetic Cu2+ ions. The geometry, spectral properties, and formation constants of H2DTC and its complexes with Zn2+ are studied. The chemosensor shows remarkable accuracy and precision in detecting intracellular Cu2+ and Zn2+ ions.
INORGANIC CHEMISTRY
(2022)
Article
Energy & Fuels
Suhaib Ahmad Khan, Mohd Tariq, Asfar Ali Khan, Shabana Urooj, Lucian Mihet-Popa
Summary: This study investigates the dielectric characteristics of pure synthetic ester oil and its related nanofluids using ZnO and CuO nanomaterials. The results show that ZnO nanofluid has a higher breakdown voltage, while CuO nanofluid exhibits the minimum dissipation factor even at higher temperatures.
Article
Chemistry, Inorganic & Nuclear
Oksana Nesterova, Olga Yu Vassilyeva, Brian W. Skelton, Alma Benko, Armando J. L. Pombeiro, Dmytro S. Nesterov
Summary: A novel iron complex was synthesized and shown to form supramolecular dimeric units in the solid state, displaying antiferromagnetic properties. In catalytic studies, the complex acted as an efficient catalyst in the oxidation of cyclohexane.
DALTON TRANSACTIONS
(2021)
Article
Biochemistry & Molecular Biology
Yosuke Mizuno, Kota Katayama, Hiroo Imai, Hideki Kandori
Summary: The proton transfer reaction is one of the key triggers for the functional expression of membrane proteins. An unexpected proton transfer reaction was discovered in cone opsins during the early photoreaction process, which involves dramatic changes in the protein environment.
Article
Chemistry, Multidisciplinary
Joaquin Caceres-Vasquez, Danilo H. Jara, Juan Costamagna, Fabian Martinez-Gomez, Carlos P. Silva, Luis Lemus, Eleonora Freire, Ricardo Baggio, Cristian Vera, Juan Guerrero
Summary: In this study, a series of six new Cu(i) complexes were synthesized and their self-association effects on structural and electrochemical properties were investigated. The results showed that these complexes formed dimers through supramolecular pi stacking and hydrogen bonding. H-1-NMR experiments revealed a monomer-dimer equilibrium in solution, with dimers having similar structures to those in the crystal. Thermodynamic parameters were calculated to understand the self-association process. Electrochemical analysis indicated that the monomer and dimer species were in chemical equilibrium. The study emphasized the importance of non-covalent intermolecular interactions in the structuring and stability of Cu(i) complexes.
Article
Engineering, Environmental
Cheng Wang, Siqi Huo, Guofeng Ye, Pingan Song, Hao Wang, Zhitian Liu
Summary: In this study, a multifunctional curing agent was designed to improve the flame retardancy of epoxy resin (EP) and enhance its UV-blocking and mechanical properties. EP/30PES showed better mechanical and flame retardant properties compared to EP/15PEI. EP/30PES also exhibited durable flame retardancy.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Polymer Science
Qingshan Yang, Jun Wang, Shuang Yang, Siqi Huo, Pingan Song, Zhengping Fang, Hao Wang
Summary: A phosphorus-containing aliphatic amine curing agent (DPT) was synthesized and used as a flame-retardant curing agent for epoxy resin systems. The introduction of phosphorus-based group reduced the curing activity. The DPT-containing EP systems exhibited improved flame retardancy and smoke suppression due to the bi-phase flame-retardant action of DPT.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Polymer Science
Guofeng Ye, Siqi Huo, Cheng Wang, Pingan Song, Zhengping Fang, Hao Wang, Zhitian Liu
Summary: In this study, a novel hyperbranched, P-P synergetic, bio-based flame retardant (DIT) was synthesized, which could enhance the fire safety, mechanical properties, thermal resistance and transparency of epoxy resins. The addition of 2 wt% DIT enabled the EP/2DIT sample to achieve a UL-94 V-0 rating and a limiting oxygen index (LOI) of 36.6%. DIT demonstrated durable flame retardancy and improved the elongation at break, tensile strength, flexural strength and impact strength of the EP/2DIT sample. The high efficiency of DIT as a flame retardant was attributed to the synergism between DOPO and THPO.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Polymer Science
Jingsheng Wang, Xi Chen, Jun Wang, Shuang Yang, Kaiwen Chen, Lu Zhu, Siqi Huo, Pingan Song, Hao Wang
Summary: Carbon fiber reinforced polymer (CFRP) composite, as a lightweight material, has excellent comprehensive properties. However, low production efficiency and inherent flammability are two crucial limitations for its further application. In this study, two phosphorus-derived imidazoliums (CEPM-1 and CEPM-2) were synthesized by aqueous self-assembly and applied to flame-retardant epoxy resins (EPs). The resulting EP/CEPM-1-25 and EP/CEPM-2-20 showed superior flame retardancy and were used as resin matrixes for CFRP composites with high LOIs and UL-94 V-0 classification.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Polymer Science
Beibei Wang, Xuanye Wang, Yi Liu, Qiuhui Zhang, Guochao Yang, Daihui Zhang, Hongwu Guo
Summary: In this study, marigold straw polyurethane composites (MPCs) treated with phytic acid (PA) and iron oxide (Fe2O3) were fabricated to improve the flame retardance and smoke suppression of wood-plastic composites.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Chemistry, Physical
Guangyuan Yang, Ning Hou, Zheming Li, Ke Huang, Bin Zhang, Jie Xu, Jiuxiao Sun
Summary: Porous composites with a regulated inter-connected hole structure and controllable porosity were successfully prepared via a facile freeze-drying method using cotton cellulose nanofiber (CCNF) as the main framework and aramid nanofiber (ANF) as a reinforcer. The introduction of a small amount of ANF improved the thermal collapse resistance of the porous materials. The porous composites exhibited decreased porosity and increased pressure drop performance with increased addition of CCNF and ANF. The as-prepared porous composite could be a promising candidate in the tobacco field.
Article
Polymer Science
Feifan Wu, Jun Wang, Jingsheng Wang, Kaiwen Chen, Shuang Yang, Siqi Huo, Hao Wang
Summary: In this study, a well-designed BICP additive was used to enhance the integrated performances of BA-a. The BA-a/BICP systems exhibited lower curing temperature and better thermal resistance. The introduction of BICP significantly enhanced the fire safety of BA-a.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Lingfeng Yu, Siqi Huo, Cheng Wang, Guofeng Ye, Pingan Song, Jiabing Feng, Zhengping Fang, Hao Wang, Zhitian Liu
Summary: Introducing a bio-based, furan-containing polyphosphoramide (DFDP) enhances the flame retardancy of poly(L-lactic acid) (PLA) while maintaining its mechanical properties. PLA with 2 wt% DFDP achieved a UL-94 V-0 rating and an increased limiting oxygen index (LOI) of 30.8%. DFDP effectively improved the strength, toughness, and UV protection of PLA. This study provides a sustainable and comprehensive strategy for creating flame-retardant biomaterials with improved UV protection and preserved mechanical properties, making them suitable for various industrial applications.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Polymer Science
Mei Qiu, Xi Chen, Jun Wang, Jingsheng Wang, Kaiwen Chen, Shuang Yang, Siqi Huo, Hao Wang
Summary: A novel and effective strategy for improving the flame retardancy of thermosetting resins was proposed by covalently introducing phosphorus/nitrogen flame retardant and diphenyl methane diisocyanate into the cross-linked network of vinyl ester resin. The as-prepared resin showed increased glass-transition temperature and superior flame-retardant properties, achieving a UL-94V-0 classification.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Pengcheng Zhou, Junjie Wang, Ting Bai, Venkata Chevali, Dan You, Siqi Huo
Summary: In this study, flame-retardant epoxy composites with high performance and fire safety were prepared through simple blending of biomass chitosan and DOPO. By adjusting the mass ratio of chitosan to DOPO, UL-94 V-0 flame retardancy was achieved with increased limiting oxygen index and mechanical properties.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Engineering, Environmental
Qingshan Yang, Jun Wang, Xi Chen, Shuang Yang, Siqi Huo, Qiufei Chen, Pengzong Guo, Xiao Wang, Fu Liu, Wei Chen, Pingan Song, Hao Wang
Summary: A novel phosphorus-containing tertiary amine hardener was synthesized and applied to fabricate high-performance epoxy resins. The addition of phosphorus reduced the reactivity of the tertiary amine, but the epoxy resins showed increased glass-transition temperature, char yield, and improved mechanical properties. Additionally, the hardener conferred excellent flame retardancy and smoke suppression to the epoxy resins.
CHEMICAL ENGINEERING JOURNAL
(2023)
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
Chemistry, Physical
Xiaogang Su, Jun Wang, Mengjie Han, Yanan Liu, Bin Zhang, Siqi Huo, Qilei Wu, Yaqing Liu, He-Xiu Xu
Summary: This study reports a novel strategy of enhancing electromagnetic wave absorption using pure carbon aerogel with oriented structure. By modulating the carbonization degree and wave propagation path, effective absorption is achieved. The aerogel exhibits ultra-light weight, super hydrophobicity, superior compressibility, and thermal insulation.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Applied
Jianzhong Zhang, Yang Fang, Anlin Zhang, Youming Yu, Lina Liu, Siqi Huo, Xuesen Zeng, Hong Peng, Pingan Song
Summary: This study proposes a new surface modification strategy by synthesizing a Schiff base-coated ammonium polyphosphate (MAPP) to improve the flame retardancy and thermal stability of unsaturated polyester resin (UPR). The addition of MAPP enhances the mechanical properties of UPR and inhibits heat and smoke release during combustion. The results show that MAPP is an efficient flame retardant for UPR and has potential applications in various industries.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Engineering, Environmental
Jiahao Ren, Siqi Huo, Guobo Huang, Tianle Wang, Jiabing Feng, Wei Chen, Shenwei Xiao, Pingan Song
Summary: The widespread use of highly flammable ABS resin poses a great fire threat to humans and the environment. However, current flame retardants often sacrifice mechanical and thermal properties while improving flame retardancy. In this study, a novel phosphorus and nickel co-doped graphitic carbon nitride nanoflakes were developed to address this trade-off. The addition of the new material significantly improved the thermal and mechanical properties of ABS composite, resulting in excellent anti-ignition, flame-retardant, and smoke-suppressive performances. This research provides a new design strategy for fabricating fire-safe polymer composites with superior properties.
CHEMICAL ENGINEERING JOURNAL
(2023)
