Article
Engineering, Multidisciplinary
Yanlin Liu, Binbo Wang, Songqi Ma, Tao Yu, Xiwei Xu, Qiong Li, Sheng Wang, Yingying Han, Zhen Yu, Jin Zhu
Summary: The study introduces fully bio-based catalyst-free epoxy vitrimers for Carbon Fiber Reinforced Composites (CFRCs), showing exceptional malleability and reprocessability through compression molding. The material also demonstrates outstanding degradability, allowing for multiple recoveries of carbon fibers without damage.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Composites
Chun Yan, Jun Wei, Yingdan Zhu, Haibing Xu, Dong Liu, Gang Chen, Xiaoqing Liu, Jinyue Dai, Dongxi Lv
Summary: The recycling of carbon fiber reinforced bio-based degradable epoxy resin composites is important for resource saving, environment protection and sustainable development. Resin transfer molding (RTM) is a promising process for manufacturing these composites cost-effectively. In this study, CF composites were prepared using a biodegradable epoxy resin, DEPVD, and DDS as a curing agent. The mechanical properties and degradability of the composites were investigated.
POLYMER COMPOSITES
(2023)
Article
Chemistry, Multidisciplinary
Benjamin R. Freedman, Oktay Uzun, Nadja M. Maldonado Luna, Anna Rock, Charles Clifford, Emily Stoler, Gabrielle Ostlund-Sholars, Christopher Johnson, David J. Mooney
Summary: The development of degradable tough adhesive hydrogels with excellent mechanical and adhesive properties provides a foundation for various in vivo applications, allowing for on-demand removal without causing harm to underlying skin tissue. These new formulations show equivalent performance to nondegradable counterparts, complete degradation within weeks to months in vivo, and minimal fibrous encapsulation and no signs of organ toxicity after implantation.
ADVANCED MATERIALS
(2021)
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
Tianyu Zhu, Chunxiang Lu, Xiaoxuan Lu, Jieying Zhi, Yingjun Song
Summary: A new epoxy-terminated hyperbranched polyether sulfone (EHPES) was synthesized and modified in diglycidyl ether of bisphenol-A (DGEBA), improving the comprehensive performance of the copolymer, especially the tensile, flexural, and impact strengths.
Article
Chemistry, Multidisciplinary
Kouki Akaike, Yukihiro Shimoi, Toshiaki Miura, Hiroshi Morita, Haruhisa Akiyama, Shin Horiuchi
Summary: Adhesive bonding plays a crucial role in various fields like mobility, dentistry, and electronics. However, the understanding of interfacial phenomena in adhesive bonding is still limited, making it difficult to select surface treatment and adhesive types. In this study, the authors investigated the roles of chemical interactions and mechanical interlocking in adhesive bonding between epoxy/amine adhesive and two types of aluminum adherends. They found that protonation of amino groups on the adhesive side resulted in an interfacial dipole layer, which increased the interfacial fracture energy. Furthermore, mechanical interlocking from surface roughness further enhanced the fracture energy. This study provides insights into the adhesion mechanism at the epoxy adhesive/aluminum interface.
Article
Construction & Building Technology
Lukasz Sadowski, Lukasz Kampa, Agnieszka Chowaniec, Aleksandra Krolicka, Andrzej Zak, Hassan Abdoulpour, Sabrina Vantadori
Summary: This study proposes a novel epoxy resin bonding agent with added coconut fibers to improve the bonding strength of epoxy resin coating systems. Tests showed that the addition of coconut fibers increased pull-off strength of the coating, but a higher volume fraction of fibers led to more pronounced delamination failure between the epoxy resin and substrate.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Raquel Gimenez, Berna Serrano, Veronica San-Miguel, Juan Carlos Cabanelas
Summary: This review provides an overview of the recent progress in MXene/epoxy nanocomposites development and the contribution of nanofillers to the enhancement of properties. The application of MXene as a nanofiller in epoxy resins is discussed, highlighting its potential in protective coatings, electromagnetic-interference shielding, and composites. The challenges in this field are also discussed.
Article
Polymer Science
Andrzej Komorek, Robert Szczepaniak, Pawel Przybylek, Kacper Komorek, Zenon Komorek, Jan Godzimirski, Andrzej Zbrowski
Summary: The research modified the basic adhesive composition to estimate the effect of fatigue loading on the temperature of the adhesive material. The temperature of the materials was recorded using a thermal imaging camera and a thermoelectric thermometer. An increase in the number of load cycles corresponded to an increase in the temperature of most tested materials at 20 Hz, while a decrease in temperature was observed for modified samples at a frequency of 30 Hz after a certain value. Fatigue loading caused an increase in the temperature of all tested polymeric materials. The use of a thermal imaging camera allowed for simple identification of areas with the highest temperature during testing, providing more practical use compared to thermocouple thermometers.
Article
Chemistry, Physical
Yue Jiang, Shuai Wang, Weifu Dong, Tatsuo Kaneko, Mingqing Chen, Dongjian Shi
Summary: The authors developed a high-performance, degradable, and recyclable bio-based epoxy resin by reacting the lignin derivative vanillin with 4-amino cyclohexanol via Schiff base. This resin exhibited higher Young's modulus and tensile strength compared to bisphenol A epoxy. It also showed good degradation in an acidic environment and recoverability through heat treatment. Additionally, the resin could be used to prepare carbon fiber-reinforced composites, with the carbon fiber being completely recyclable. This study provides a pathway for the preparation of high-performance epoxy resin and the effective recycling of carbon fiber.
Article
Chemistry, Multidisciplinary
Ying Ge, Xueqin Zhang, You Shi, Yuanbo Cai, Shengtai Zhou, Mei Liang, Huawei Zou
Summary: A novel MCA modified epoxy material with superior flexibility, damping, and durability was synthesized in this study, showing potential for broad application in automotive and aerospace fields.
MATERIALS CHEMISTRY FRONTIERS
(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
Polymer Science
Tianwen Dai, Shuaiwei Yuan, Huawei Zou, Pengbo Liu
Summary: The FETE is a novel epoxy resin with high thermal degradation performance. By copolymerizing with TDE-85, the Tg of the copolymer can be adjusted and the compatibility can be improved, showing potential applications in reworkable electronic packaging, recycling or degradable epoxy resin area.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Polymer Science
Osei Asibe Asafu-Adjaye, Jason Street, Archana Bansode, Maria L. Auad, Maria Soledad Peresin, Sushil Adhikari, Terry Liles, Brian K. Via
Summary: This study investigated the use of bio-oil-based epoxy resin as an adhesive for oriented strand board (OSB) production. The results showed that the bio-oil and epoxy resin had a superior reaction at 20% bio-oil substitution. The scanning electron microscopy images indicated that the adhesive had bulk phase homogeneity. The mechanical properties and water resistance of the OSB panels were feasible up to 30% bio-oil substitution.
Article
Polymer Science
Zhaoqun Pan, Zhun Zhang, Yiting Mo, Yu Cheng, Liuqing Zhu
Summary: In this study, EPTS was successfully synthesized via the hydrosilylation reaction and mixed with E51 epoxy resin to obtain a composite epoxy resin. The tensile test showed that the toughness of the composite epoxy resin significantly improved. The toughening mechanism was revealed through scanning electron microscopy. This material has the advantages of a simple synthesis process, low cost, and promising applications.
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.