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Tailoring Epoxy Network Architecture and Stiffness-Toughness Balance Using Competitive Short- and Long-Chain Curing Agents: A Multiscale Simulation Study

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polymers 2025年第10期17卷 1297-1297页

作者： Dong, Zhiyong Li, Yuqing Huang, Renhai Zhang, Xuze Li, Mingyang Liu, Duo Shi, Rui Zhu, Xuanbo Mu, Jianxin Qian, Hujun State Key Laboratory of Supramolecular Structure and Materials Institute of Theoretical Chemistry College of Chemistry Jilin University Changchun130012 China Key Laboratory of High Performance Plastics National & Local Joint Engineering Laboratory for Synthesis Technology of High Performance Polymer College of Chemistry Jilin University Ministry of Education Changchun130012 China

Designing high-performance crosslinked polymers requires overcoming the inherent stiffness–toughness trade-off through precise control of the network topology. Using epoxy resin as a model system, we establish a multiscale simulation framework to investigate curing reaction kinetics, network evolution, and structure–property relationships. By employing m-phenylenediamine (mPDA) and 1,3-bis(3-aminophenoxy)benzene (DABPB) as competing short- and long-chain curing agents, we demonstrate how network architecture dictates mechanical performance. Simulations reveal that mPDA produces a dense, heterogeneous network with enhanced stiffness, whereas DABPB forms a more uniform structure with greater chain mobility, leading to improved toughness. Through stoichiometric tuning, we achieve fine control over crosslink density and mechanical properties. Furthermore, we decouple cavity formation mechanisms into pendant chain slippage and bond rupture, offering molecular-level insights for the rational design of epoxy resins with programmable mechanical behavior. © 2025 by the authors.

关键词： Equilibrium constants

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Preparation and Properties of Hybrid Silane-crosslinked Sulfonated Poly(aryl ether ketone)s as Proton Exchange Membranes

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Chemical Research in Chinese Universities 2019年第5期35卷 937-944页

作者： LIU Zhenchao WANG Peng HU Wei LIU Baijun Key Laboratory of High Performance Plastics Ministry of EducationNational & Local Joint Engineering Laboratory for Synthesis Technology of High Performance PolymerCollege of ChemistryJilin UniversityChangchun 130012P.R.China College of Chemical Engineering Changchun University of TechnologyChangchun 130012P.R.China

A series of novel organic-inorganic hybrid proton-conducting electrolyte membranes with silane-crosslinked sulfonated poly(aryl ether ketone)(SC-SPAEK) networks was prepared via a simple procedure that includes solution casting and acid treatment. The organosilicon pendants of the silane-grafted SPAEK, which were expected to serve as coupling and crosslinking agents, were found to play a key role in the homogenous dispersion of inorganic particles and improved the performance of hybrid membranes. The hybrid membranes exhibited enhanced proton conductivity, and SC-SPAEK/TiO2-4 showed an extremely high proton conductivity of 0.1472 S/cm at 100℃. The crosslinked hybrid membranes also demonstrated good chemical resistance, oxidative stability, and mechanical properties. The crosslinked hybrid membranes with excellent comprehensive performance may be a promising material for proton exchange membrane fuel cells.

关键词： Proton-conducting electrolyte membrane Sulfonated poly(aryl ether ketones) Cross-linked network Hybrid

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Polyacrylamide/Sodium Alginate Photochromic Hydrogels with Enhanced Toughness and Fast Response for Optical Display and Rewritable Information Record

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SSRN 2022年

作者： Wu, Xiangyong Deng, Xian Song, Ying Zhang, Zhenxiao Su, Hao Han, Ying Shen, Yihui Liu, Sitong Sun, Keying Yao, Hongyan Guan, Shaowei Key Laboratory of Advanced Structural Materials Ministry of Education College of Materials Science and Engineering Changchun University of Technology Changchun130012 China Nanchang Institute of Technology No. 901 Yingxiong Road Changbei Economic Development District NanchangCN 330044 China Ministry of Education National & Local Joint Engineering Laboratory for Synthesis Technology of High Performance Polymer College ofChemistry Jilin University 2699 Qianjin Street Changchun130012 China

Photochromic hydrogels have broad prospects in wearable optoelectronic technology, rewritable information storage technology, biological imaging agents and chemical sensors, etc. However, it is still a challenge to develop photochromic hydrogels with high transparency, mechanical properties, fast response, stability and color reversibility. In this study, a novel photochromic hydrogel (PAAm/SA-Mo7) was prepared by loading ammonium molybdate (Mo7) into a double-network hydrogel of polyacrylamide (PAAm) and sodium alginate (SA) through a facile one-step method. The introduction of SA and Mo7 significantly improved the mechanical properties of hydrogels, and the maximum elongation and breaking energy are 27.5 and 86 times higher than those of pure PAAm. Furthermore, the photochromic hydrogels have fast response and stable reversible color change. The coloring and bleaching process of hydrogels can be precisely controlled by the time and intensity of UV irradiation, and the fading process can also be controlled by temperature. The photochromic hydrogel can be applied to self-erasing rewritable media and information storage. This work provides a new approach for the development of flexible wearable optoelectronic materials. © 2022, The Authors. All rights reserved.

关键词： Hydrogels

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Rücktitelbild: Anisotropic Semicrystalline Homopolymer Dielectrics for high-Temperature Capacitive Energy Storage (Angew. Chem. 24/2024)

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Angewandte Chemie 2024年第24期136卷

作者： Dr. Wenhan Xu Chenyi Zhou Dr. Wenhai Ji Prof. Yunhe Zhang Prof. Zhenhua Jiang Dr. Florian Bertram Dr. Yingshuang Shang Prof. Haibo Zhang Dr. Chen Shen National and Local Joint Engineering Laboratory for Synthetic Technology of High-Performance Polymer Institution College of Chemistry Jilin University Deutsches Elektronen-Synchrotron DESY Notkestr. 85 22607 Hamburg Germany

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Anisotropic Semicrystalline Homopolymer Dielectrics for high-Temperature Capacitive Energy Storage

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Angewandte Chemie 2024年第24期136卷

high-temperature dielectric polymers are in high demand for powering applications in extreme environments. Here, we have developed high-temperature homopolymer dielectrics with anisotropy by leveraging the hierarchical structure in semicrystalline polymers. The lamellae have been aligned parallel to the surface in the dielectric films. This structural arrangement resembles the horizontal alignment of nanosheet fillers in polymer nanocomposites and nanosheet-like lamellae in block copolymers, which has been proven to provide the optimal topological structure for electrical energy storage. The unique ordering of lamellae in our dielectric films endue a significantly increased breakdown strength and a reduced leakage current compared to amorphous films. This novel approach of enhancing the capacitive energy storage properties by controlled orientation of lamellae in homopolymer offers a new perspective for the design of high-temperature polymer dielectrics.

关键词： polymer dielectrics capacitive energy storage anisotropic crystalline high temperature

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Back Cover: Anisotropic Semicrystalline Homopolymer Dielectrics for high-Temperature Capacitive Energy Storage (Angew. Chem. Int. Ed. 24/2024)

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Angewandte Chemie International Edition 2024年第24期63卷

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Hyaluronan-based hydrogel achieves in situ administration of protocatechualdehyde to polarize macrophages to M2 phenotype for diabetic wound therapy

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International Journal of Biological Macromolecules 2025年第PT 3期318卷 145118页

作者： Xiaohuan Song Dong Li Tingting Guo Xingze Zou Xiaobo Liu Xinyi Zhou Ziqian Bin Zheng Chen Jianfeng Guo School of Pharmaceutical Sciences Jilin University Changchun 130021 China Department of Pharmacy the Affiliated Hospital of Changchun University of Chinese Medicine Changchun 130021 China Faculty of Innovation Engineering Macau University of Science and Technology Macau 999078 China Key Laboratory of High-Performance Plastics Ministry of Education National & Local Joint Engineering Laboratory for Synthesis Technology of High-Performance Polymer College of Chemistry Jilin University Changchun 130012 China

Wound healing destruction brings disability and mortality to patients with diabetes mellitus. Macrophages maintain pro-inflammatory M1 phenotype to halt diabetic wound recovery. Strategies to polarize M1 macrophages into anti-inflammatory and pro-healing M2 phenotype can propel diabetic wound recovery. The fields of wound repair and tissue regeneration have been advanced by developing phytomedicines and their bioactive compounds. polymeric biomaterials can be used to prepare hydrogels for cutaneous drug administration. In this study, protocatechualdehyde (PCAE), a natural phenolic acid found in herbal medicine namely Salvia miltiorrhiza Bunge , was confirmed to overcome M1-to-M2 macrophage conversion dysfunction. PCAE was covalently conjugated with hyaluronic acid (HA) to form hydrogel (HA-PCAE). When HA-PCAE was placed onto full-thickness wounds of mice with streptozocin-induced diabetes, it resulted in inflammation attenuation, vascular development, granulation tissue generation, and collagen deposition. Pro-healing effects were attributed mainly to PCAE-mediated macrophage remodeling from M1 to M2 phenotype. Notably, HA-PCAE profoundly augmented diabetic wound recovery as compared with PCAE-loaded hydrogel formed using commercially available carboxymethylcellulose (INTRASITE Gel). This study reveals macrophage-modulatory capacity of PCAE, and demonstrates translational potential of HA-PCAE for diabetic wound treatment.

关键词： Biopolymer Macrophage polarization Natural product Regenerative therapeutics Topical drug delivery

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Carbonized polymer dots confined active Ru-O sites for boosting electrocatalytic oxygen evolution

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Chinese Chemical Letters 2025年

作者： Da Yue Tanglue Feng Zhicheng Zhu Mingcheng Zhang Liyuan Chen Xiao Han Haizhu Sun Bai Yang State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 China School of Chemical Engineering Zhengzhou University Zhengzhou 450001 China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 China National & Local Joint Engineering Laboratory for Synthesis Technology of High Performance Polymer College of Chemistry Jilin University Changchun 130012 China National & Local United Engineering Laboratory for Power Batteries College of Chemistry Northeast Normal University Changchun 130024 China

Designing efficient and stable electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance for many energy-related technologies and devices. Herein, we propose a controlled oxidation pyrolysis strategy to develop carbonized polymer dots (CPDs)-modified Rh-doped RuO 2 electrocatalyst (Rh-RuO 2 /CPDs). CPDs act as structure-directing agents, facilitating the formation of small-sized Rh-RuO 2 /CPDs nanoparticles and engineering them with abundant defective structures and stable Ru-O sites. The experimental results and theoretical simulation unravel that the modulation effect of CPDs and Rh doping can effectively regulate the electronic structure, valence state and morphology of active Ru-O sites, thereby enhancing the electron transfer at the active site interface and optimizing the chemisorption behavior of oxygen intermediates. The resultant Rh-RuO 2 /CPDs demonstrates overpotentials of 168 mV and 197 mV at 10 mA/cm 2 for OER in 0.5 mol/L H 2 SO 4 and 1.0 mol/L KOH solution, respectively, and long-term catalytic stability.

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high-efficiency preparation of large-sized MXene nanosheets for flexible piezoresistive sensors with high sensitivity and wide strain range

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Chemical engineering Journal 2025年 515卷

作者： Zhang, Fan Zhang, Xiaobo Yang, Tingting Shi, Kaixiang Han, Ying Song, Xiaolei Yao, Hongyan Song, Ying Key Laboratory of Advanced Structural Materials Ministry of Education College of Materials Science and Engineering Changchun University of Technology Changchun130012 China National & Local Joint Engineering Laboratory for Synthesis Technology of High-Performance Polymer College of Chemistry Jilin Univerity 2699 Qianjin Street Changchun130012 China Guangzhou Key Laboratory of Clean Transportation Energy Chemistry School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou510006 China

The concurrent attainment of high sensitivity and broad response range in piezoresistive sensors remains a critical challenge. While single-layer MXene characterized by large interlayer spacing, high specific surface area, flexibility, and superior electrical conductivity—holds promise for enhancing sensor performance, conventional synthesis methods suffer from inefficient exfoliation and low yield, hindering practical applications. Herein, we propose a novel strategy to synthesize single-layer MXene nanosheets via a mixed-acid (HF/HCl) etching system with lithium chloride (LiCl) as an intercalation agent. This approach achieved remarkable exfoliation efficiency (up to 70 %) while endowing MXene with a wrinkled morphology and an expanded specific surface area. Subsequently, MXene/polyimide (MXene/PI) composite aerogels were fabricated by integrating MXene nanosheets into a PI flexible substrate, serving as pressure-sensitive materials. The composite aerogels exhibited a highly aligned lamellar microstructure, synergizing MXene's conductivity with PI's flexibility, thereby significantly improving both sensitivity and response range. At an optimal MXene content of 14 %, the sensor demonstrated exceptional performance: a wide response range (0–27.1 kPa) and a high sensitivity of 2.65 kPa−1 under a large applied stress of 27.1 kPa, surpassing existing counterparts. Further applications revealed the sensor's capability in precisely detecting physiological signals (e.g, finger, wrist, and elbow movements). Additionally, the composite aerogel showcased multifunctionality, including superior thermal insulation (>90 % heat retention), efficient electromagnetic interference (EMI) shielding (45 dB at 10 GHz), and oil–water separation efficacy (>98 % for non-polar solvents). These findings highlight the material's potential in wearable electronics, environmental remediation, and EMI shielding technologies, paving the way for next-generation multifunctional sensors. © 2025 Elsev

关键词： Nanosheets

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Compatibility-driven modulation of mechanical property in 3D printed PEEK blends

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polymer 2025年 333卷

作者： Yang, Yang Jiang, Bo Liu, Haodong Zhao, Ting Yu, Chang Yang, Boyin Gao, Hong Li, Xuefeng Shang, Yingshuang Zhang, Haibo National and Local Joint Engineering Laboratory for Synthetic Technology of High-Performance Polymer College of Chemistry Jilin University Changchun130012 China Jilin Univ Hosp Stomatol Jilin Prov Key Lab Tooth Dev & Bone Remodeling Dept Oral Pathol Changchun130021 China China

Additive manufacturing of poly ether ether ketone (PEEK) is increasingly used to produce complex three-dimensional (3D) products, but controlling interlayer performance remains challenging. To address this, we synthesized a series of rigid fluorene-containing amorphous polymers by systematically modulating the molar ratio of resorcinol to bisphenol fluorene with varying compatibility with PEEK. These polymers were then blended with PEEK to investigate the compatibility effects on interlayer properties. A relationship among interlayer strength and the diffusion and entanglement of polymer chains was established. Isothermal crystallization studies revealed that blending with amorphous polymers extends the crystallization time of PEEK and enhances interlayer healing, thereby improving interlayer strength. Atomic force microscopy-infrared tests confirmed the accumulation and diffusion of amorphous and partially compatible fluorene-containing polymers at the interface of the blends, which enables the best-performing blends to have three times the interlayer strength of pure PEEK. These findings provide valuable insights into the molecular chain dynamics during printing, supporting the development of materials with optimized interlayer properties. © 2025

关键词： Bond strength (materials)

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