Article
Polymer Science
Qiuyue Ding, Ning Ding, Xiangfeng Chen, Wenyue Guo, Fahmi Zairi
Summary: This study investigates the effect of grain boundaries (GBs) on the mechanical properties of epoxy/graphene composites through molecular dynamics simulation. Ten GB models were constructed and comparisons were made. The results revealed significant effects of GBs on the tensile and compressive behaviors, glass transition temperature (T-g), and configurations of epoxy/graphene composites. The underlying mechanisms involve multi-factor coupling, including the tensile strength of reinforcements, interfacial interaction energy, and inflection degree of reinforcements, resulting in a diversity in the tensile yield strength of the composites.
Article
Polymer Science
Thidarat Kanthiya, Krittameth Kiattipornpithak, Nanthicha Thajai, Yuthana Phimolsiripol, Pornchai Rachtanapun, Sarinthip Thanakkasaranee, Noppol Leksawasdi, Nuttapol Tanadchangsaeng, Choncharoen Sawangrat, Pitiwat Wattanachai, Kittisak Jantanasakulwong
Summary: In this study, modified PLAEC materials were prepared by melt blending PLA with epoxy resin and chitosan. The addition of chitosan and annealing treatment significantly improved the mechanical properties, morphology, and thermal properties of the PLAEC materials.
Article
Materials Science, Ceramics
Dawei Sun, Jiaxin Wang, Hui Wang, Zheng Yan, Wenxu Ma, Xiaoyu Ma, Yali Wang, Zhongcheng Ma, Xiaodong Jin, Shibing Sun, Suping Cui, Zhiyong Wang
Summary: This study investigates the interaction between load-induced broken panels of C-S-H gel and cured epoxy resins with different crosslink densities (e.g., 0.23, 0.77, and 0.97) using molecular dynamics methods. The results show that crosslink density plays a crucial role in the geometrical size and atom distributions. Low crosslink density leads to phase separation due to the aggregation of amine molecules, while high crosslink density results in high porosity in the interfacial region, degrading the mechanical performance of materials.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Engineering, Multidisciplinary
Hao Wang, Jun Yuan, Zongmin Zhu, Xianze Yin, Yunxuan Weng, Zhaojia Wang, Feihua Yang, Jiayu Zhan, Hua Wang, Luoxin Wang
Summary: This study successfully prepared EP/BDO composites with excellent comprehensive performance by synthesizing a reactive flame-retardant BDO, which showed significant improvements in flame retardance, mechanical properties, and transparency. The composites also exhibited heat and smoke suppression effects, in addition to enhanced tensile and bending strength compared with neat EP.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Ji-nian Yang, Yu-xuan Xu, Shi-bin Nie, Xue-song Feng, Liu Jiang
Summary: The study showed that organic-modified NiPS particles significantly improved the tribological properties of EP composites, reducing wear rate by up to 95% under dry sliding conditions. Moreover, these particles had a minor influence on tensile strength but enhanced thermal stability of the composites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Multidisciplinary
Chenyu Zhou, Junjie Wang, Kunxiong Wu, Zhiquan Pan, Qingrong Cheng, Lu Feng, Hanjun Wu, Hong Zhou
Summary: A facile, green, and high-yielding strategy for the synthesis of chitosan-metal complex flame retardants (CS-Fe) has been reported in this study, which can enable EP composites to achieve the UL-94 V-1 rating while enhancing both strength and toughness.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Engineering, Environmental
Xinming Ye, Jingjing Li, Wenchao Zhang, Ye-Tang Pan, Rongjie Yang, Jiarong Li
Summary: This study successfully synthesized Na-MOSS with well-defined macrocyclic structure and highly crystalline, exhibiting excellent thermal stability and flame-retardant effects. Introduction of Na-MOSS into epoxy resin significantly improved fire performance and smoke generation, while enhancing mechanical and dielectric properties of the material.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Physics, Applied
Boxue Du, Rundong Xue, Xiaoxiao Kong, Yun Chen
Summary: In this study, aramid fiber surface was modified with polyethylenimine (PEI) grafting after plasma surface activation treatment. The effects of PEI grafting on the dielectric and mechanical properties of aramid fiber reinforced epoxy resin composites (AFRC) were investigated. Results showed successful grafting of PEI onto the aramid fiber surface, leading to improved interfacial properties and enhanced dielectric and mechanical performance of the AFRC. This research is of significant importance for the application of AFRC in high voltage power equipment.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Composites
Liu Jiang, Shibin Nie, Jinian Yang, Jie Dong
Summary: In this study, a Setaria viridis-like heterostructure was successfully constructed by decorating rod-shaped polyaniline with fine nickel phyllosilicate lamellae. Polymer composites with different mass ratios of EP resin and heterostructures were prepared. Dry-sliding tests showed that the created composites had significantly enhanced wear resistance, with a concentration of 5% heterostructures reducing the wear rate to the lowest value. Moreover, the introduced heterostructures also improved the thermal stabilities of EP-based composites.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Yonggang Du, Ge Zhao, Gonghui Shi, Yiming Wang, Wei Li, Shitong Ren
Summary: Three novel bio-based epoxy resins were synthesized using natural flavonoids as raw materials and maleic anhydride as curing agent. The impact of crosslink structure on the mechanical properties and thermal stability of the bio-based epoxy resins was significant, but the flame retardancy was not greatly improved compared to conventional epoxy resins.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Meng Xiao, Kailun Fan, Xiaoman Feng
Summary: Nanoparticles can enhance the properties of epoxy resin at low temperature, particularly in terms of mechanical properties. The organic groups in POSS nanoparticles have varying effects on the epoxy resin.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Materials Science, Composites
Wu Fang, Wenjian Guo
Summary: This study investigated the hydrothermal aging mechanism of CF/EP composites in different mediums. The composites underwent a two-step process of water absorption, with initial Fickian diffusion followed by long-term deterioration. The composites degraded more easily in weak acidic solutions, and long-term aging led to significant degradation in all mediums.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Weichao Yuan, Weizhen Li, Shuangbao Zhu, Zhongyang Chu, Wenjun Gan
Summary: A facile and effective method was developed to prepare highly thermal conductive composites with three-dimensional boron nitride network based on epoxy spheres. The method not only enhanced the thermal conductivity of the composites, but also increased the storage modulus and T-g of epoxy resin.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Jie Fan, Panpan Li, Zhijian Wang, Jiping Yang
Summary: In this study, the temperature dependence of epoxy-based nanocomposites was comprehensively investigated using molecular dynamics simulation and experimental methods. The results showed that as temperature decreased, the molecular mobility of the nanocomposites decreased, the interfacial interaction energy increased, and the Young's modulus increased. The experimental measurements of tensile properties at different temperatures agreed well with the simulation results. Furthermore, the toughening mechanisms of the nanocomposites at different temperatures were discussed.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Long Chen, Weishi Chen, Bianhong Li, Qingbao Yang
Summary: To enhance the comprehensive thermal properties of shape memory epoxy resin (EP) composites, graphene oxide (GO) modified shape memory EP composites were prepared. The effects of GO content, GO dispersion time, dispersion time of mixture of EP and GO, dispersant type and epoxy resin type on shape recovery and thermal conductivity were investigated. Response surface optimization method was used to establish a mathematical model considering the factors and response value. The optimization results showed a significant improvement in shape recovery rate and heat conduction rate of the shape memory GO/EP composites.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Polymer Science
Yuanzhang Jiang, Xuyi Wang, Yanting Han, Dakai Gong, Yingchun Gu, Lin Tan
Summary: In this study, FeCl3 and poly(acrylic acid) (PAA) were doped into waterborne polyurethanes (WPUs) to create multifunctional materials with self-healing and antimicrobial properties. WPU/Fe/PAA-5.5, containing 5.5 wt % PAA, exhibited excellent mechanical properties, strong self-healing capabilities, and an impressive antimicrobial rate of over 90%. These supramolecular films were also highly recyclable through hot-pressing.
Article
Polymer Science
Longyu Tian, Min Wang, Guangming Liao, Baoliang Liu, Sujuan Zhang, Yucheng Sun, Zhen Meng, Jintao Zhang, Zaijun Lu
Summary: Two kinds of benzoxazine monomers were synthesized and used to prepare polybenzoxazine anion exchange membranes (AEMs) with quaternary ammonium functionalization. The LQPBZ AEM exhibited better ion conductivity and alkaline stability.
Article
Polymer Science
Claire A. Lemarchand
Summary: This study investigates the shock behavior of three different polymers through molecular dynamics simulations. The results reveal specificities in the shock behavior of polymers, including deviations from the linear relation between shock velocity and particle velocity, as well as differences in shear stress relaxation behind the shock front. It is found that the deviation of the Hugoniot locus is related to the change in the relative contribution of bonding and non-bonding potential energies, while polymers with higher glass transition temperatures exhibit slower shear stress relaxation.
Article
Polymer Science
Zengquan Liu, Xiaochun Yin, He Zhang, Shuo Gao, Qinglin Kuang, Yanhong Feng
Summary: A powder solid-state extension (PSSE) technology was proposed to address the high melt viscosity issue of UHMWPE. By uniaxial extension and sintering in the solid state, a highly self-reinforced material was prepared. X-ray diffraction and scattering techniques were used to study the structural evolution during the PSSE process, and a solid-phase induced transformation model was established.
Article
Polymer Science
Zhike Li, Anyu Luo, Rui Zhou, Xin Li, Haiyan Li
Summary: A novel high temperature resistance IL@SiO2 nanocapsules were successfully prepared and their friction and wear properties in PA6 composites were studied. The addition of IL@SiO2 nanocapsules reduced the friction coefficient and wear rate without affecting the mechanical properties of PA6. The synergy between the IL core and SiO2 wall in the nanocapsules improved the self-lubricating performance of the PA6 composites.
Article
Polymer Science
Xin Liu, Xuhong Guo, Qi Liao
Summary: In this study, an algorithm for accurately estimating viscosity is developed using molecular dynamics simulations and the Green-Kubo formula. This algorithm can be applied to complex systems with long correlations, such as macromolecular and biological simulation systems.
Article
Polymer Science
Hao Pu, Yun-Lei Hou, Jing -Zhou Chen, Dong -Lin Zhao
Summary: The use of modified graphene improves the interfacial adherence of carbon fibers to epoxy resin, resulting in enhanced interfacial and bending properties of CF and matrix in CF/EP composites, as well as increased interlaminar shear strength and flexural strength.
Article
Polymer Science
Wei-Chung Ke, Jin-Wei Lin, Manohar Reddy Busireddy, Yueh-Hsing Lee, Jiun-Tai Chen, Chain-Shu Hsu
Summary: This study introduces a crosslinkable monomer, TAIC, to synthesize three crosslinked polyimide films, which exhibit improved thermal, mechanical, and dielectric properties. The introduction of TAIC enhances the tensile strength, reduces the dielectric constant and dielectric loss, and decreases the coefficient of thermal expansion of the polyimide films.
Article
Polymer Science
Alex Kwasi Kumi, Ruiling Fan, Ye Chen, Yumei Zhang
Summary: The difference in leaching of amylopectin from cellulose/amylopectin/1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) blends during regeneration in water and aqueous ethanol has been studied. Molecular dynamics simulations showed that the dissolution and regeneration mechanisms of amylopectin in [Bmim][Cl] are similar to cellulose in ionic liquids. Water regeneration leads to weak electrostatic interactions, resulting in high leaching of amylopectin. In contrast, ethanol-water interactions enhance electrostatic interactions among amylopectin chains, limiting amylopectin leaching in aqueous ethanol.
Article
Polymer Science
Xi Zeng, Junwei Zhou, Junbiao Peng, Chunsheng Zhang, Danling Wang, Yihu Song, Qiang Zheng
Summary: This study utilizes an oligomer deep eutectic solvent (DES) based on polyethylene glycol to regulate the vulcanization kinetics of rubber. The results show that the DES can accelerate vulcanization at low temperatures without affecting the crosslinking density and Mullins effect.
Article
Polymer Science
Qianqian Yue, Yongfei Peng, Xingjian Liu, Aihua He, Huarong Nie
Summary: The addition of metal deactivators can effectively suppress the aging of TBIR, prolong its lifespan, and have no negative effects on its physical and processing properties. These research findings are of great importance for improving the stability and aging resistance of polymers.
Article
Polymer Science
J. Gomez-Caturla, J. Ivorra-Martinez, R. Tejada-Oliveros, V Moreno, D. Garcia-Garcia, R. Balart
Summary: This work focuses on the development of environmentally friendly PLA formulations by using different esters derived from geraniol as plasticizers. The results show that these esters have good compatibility with PLA, and they can effectively enhance the elongation and plasticity of PLA, reduce its glass transition temperature, and slightly improve its water absorption capabilities.
Article
Polymer Science
Dandan Li, Zhaohui Lu, Zhao Ke, Ke Xu, Fengna Dai, Youhai Yu, Guangtao Qian, Chunhai Chen
Summary: In this study, cross-linked PI aerogel membranes with low dielectric constant and high moisture resistance were prepared by co-polymerization and scraping coating technology. The incorporation of fluorinated blocks and benzimidazole ring structures resulted in novel PI aerogel membranes with fascinating dielectric properties and outstanding moisture resistance.
Article
Polymer Science
Zhaoyang Chu, Qing Zhang, Haihua Luo, Han Zhou, Fapei Zhang, Wei Chen, Wenhua Zhang
Summary: Multi-physical fields solution processing strategy is a universal and facile method for preparing various conjugated polymer films and high-performance devices. In this study, we employed a combined microfluidic flow and ultrasonication strategy (FU) for processing CP solutions, and found a pronounced synergetic effect in promoting the pre-ordering of chains in solution. The conformation order and anisotropy of the solution were revealed through various characterizations. A non-classical nucleation model for polymer crystallization in non-equilibrium solution processing was confirmed. The roles of microfluidic flow and ultrasonication in chain aggregation and crystallization were addressed through multi-physical simulations. Compared to pristine solutions, the FU strategy showed improved solution anisotropy and crystallization kinetics, resulting in higher crystallinity in films and increased mobilities in OFET devices. The FU processing strategy provides a universal approach for regulating chain conformation and aggregation in conjugated polymer solutions.