Polymer Chemistry
·
2025
·
IF 3.9
Hao Li,Qiang Liu,Yiming Du,Yanyan Liu,Wei Zhang,Xingyou Tian,Hua Wang
Two innovative molecular design strategies for epoxy curing agents to address the inherent brittleness and cryogenic limitations of conventional epoxy systems are introduced. A silane-modified curing agent (DETA-Si) and a flexible-chain-engineered curing agent (NBOn) were synthesized to achieve unprecedented mechanical–electrical–thermal synergies. The DETA-Si/EP composite demonstrates a record-breaking elongation at break of 125% (22× improvement over unmodified systems) while maintaining ultralow dielectric loss (tan δ < 0.04) and thermal stability (Td = 236 °C). The NBOn series, incorporating rigid benzene rings and tunable aliphatic chains, exhibits exceptional cryogenic resilience: 18% elongation at 298 K with >50% ductility retention after 24-hour immersion in liquid nitrogen (77 K). Conductive composites cured with EP/NBO10 show stable resistance (±5%) under 30-day cryogenic exposure. Free volume engineering, validated via WLF modeling, underpins the enhanced low-temperature performance. These advancements establish a paradigm for epoxy resins in flexible electronics operating under extreme conditions, such as flexible sensors and polar climate devices.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 18
·2499-2510
·
IF 3.304
Xinmeng Tong,Junjie Kang,Jinli Zhang,Xin Jia,Wei Li
A series of functional terminals were designed to interact with the flexible loop residues of lysozymes, aiming to produce quality protein crystals via intensified heterogeneous nucleation. On the acetamidophenyl (S-PhAc) terminals, the obtained lysozyme crystals have the largest modal size of about 270 μm. The in situ liquid-cell AFM images reflect the fact that the particle aggregation rate is greatly associated with the functional terminals at the beginning of crystallization, i.e., the fast rate is achieved as 0.088 ± 0.004 nm s−1 on S-PhAc, much higher than that on commercial siliconized square cover slides (0.025 ± 0.005 nm s−1). Combining the crystallization results with molecular modeling, it is indicated that the stronger the interactions between lysozyme loop residues and the functional terminals, the more easily the heterogeneous nucleation occurs. It is suggested that designing functional terminals targeting the feature loop residues of proteins would be a promising route to modulate protein crystallization at the early stage.
研究领域:
生物化学
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材料科学
·
结晶学
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Ying Li,Chao Liu,Wenying Zhou,Zhenzhong Hou,Qin Shi,Changdan Gong,Yi Wu
Flexible epoxy-thiol polymers were fabricated by the reaction between N, N-Diglycidyl-4-glycidyloxyaniline (NDGA), poly (propylene glycol) diglycidyl ether (PGDE) and thiol curing agent with different functionality including 3,6-dioxa-1,8-octanedithiol (DET), pentaerythritol tetra(3-mercaptopropionate) (PETMP) and trimethylolpropane tris(3-mercaptopropionate) (TTMP). Liquid crystal monomer (LCM) was uniformly dispersed into epoxy-thiol polymers to prepare dispersed liquid crystal films of flexible epoxy-thiol polymers (E-PDLC films). The elongation at break and tensile strength of E-PDLC films increased to 195.9% and 25 MPa respectively. LCM showed favorable dispersibility and maintain ordered orientation of liquid crystal in E-PDLC films. The degree of order in molecular chain of epoxy-thiol polymers was increased, and chain interaction of epoxy-thiol polymers and LCM was enhanced by hydrogen-bonding. In E-PDLC films, with different thiol curing agent and LCM addition，different microscopic-ordered structure formed: ordered-layered structures and denser squamous ordered structures. Both of these two microscopic-ordered structures formed by different thiol curing agent and the addition of LCM, and afforded continuous phonon transfer paths. The thermal conductivity of E-PDLC films is up to 0.70 W m −1 K −1 . This work offered a new way to design flexible epoxy resin and intrinsic thermal conductive polymers.
研究领域:
材料科学
·
热传导工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCES IN POLYMER TECHNOLOGY
·
2016
·Vol. 37
·期 4
·1092-1098
·
IF 1.114
Kai Hu,Lixia Bao,Xiaofeng Chen,Yao Xiao,Jingxin Lei
Castor oil-derived decanediamide, as a novel flexible epoxy curing agent, was synthesized by esterization with methanol and ammonolysis with ammonia. The chemical structure and thermal properties of this novel curing agent were confirmed by Fourier transform infrared spectroscopy (FT-IR), 1 H nuclear magnetic resonance ( 1 H NMR) analysis, differential scanning calorimeter (DSC), and thermogravimetric analysis (TGA). The tensile strength, impact strength, dynamic mechanical properties, and thermal stability of cured epoxy resin were investigated by tensile tests,dynamic mechanical analysis (DMA), and TGA, respectively. The results showed that the prepared decanediamide had a high yield of 85.4%, and the epoxy resin cured by the decanediamide revealed a slight decrease in the mechanical properties and thermal stability, and a longer pot life at high temperature compared with that of a conventional epoxy curing agent. Asphalt as a toughening agent was added into this system, in order to improve the poor brittle resistance of pure epoxy resin, which proved to have good compatibility with this system and improve the brittle resistance effectively. Thus, the decanediamide has a great potential to replace some of current petroleum-based compounds in the synthesis of epoxy curing agents.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Qian Chen,Xiang Wang,Jianyu Liang,Tingting Zhang,Xingwu Jiang,Peifeng Liu
With the emergence of flexible electronics technologies based on stretchable, foldable, and bendable properties, there is a growing need for new thermal interface materials (TIMs) that possess better flexibility and stretchability. Epoxy resins, as thermal management materials commonly used to improve heat transfer and heat transport , need to have high thermal conductivity as well as excellent flexibility and a degree of stretchability. In order to devise TIMs that can be employed with flexible electronic devices, here we propose a strategy to form a flexible thermal conductive network structure with the shape of a “rice plant” inside the flexible epoxy resin matrix . The polyvinyl alcohol (PVA) flexible network skeleton constructed by the electrostatic spinning technique is regarded as the branches of the rice plant, and the ultra-sonicated boron nitride nanosheets (BNNS) are assumed to be the granular rice seeds. As a result, a perfect interconnected thermal conductivity path can be constructed, and the thermal conductivity is greatly enhanced with a relatively low boron nitride loading. Additionally, the prepared EP/PVA@S-BNNSs epoxy composites can exhibit a low elastic modulus and 153 % elongation at the break, demonstrating superior electrical insulation and excellent ductility, making them suitable for a wide range of applications in flexible electronic and wearable devices .
研究领域:
材料科学
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热管理技术
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Ying Li,Xiaoxiao Huang,Zexing Deng,Yiping Guo,Wenying Zhou,Liang Zhang,Fan Zhao,Changdan Gong,Yi Wu
Flexible epoxy liquid crystal dispersed membranes (ELCMs) with high thermal conductivity (TC) were successfully prepared by using high-voltage directional molding. Epoxy liquid crystal monomers (Epoxy-LC 1 and Epoxy-LC 2 ) were uniformly dispersed into flexible epoxy polymers cured by pentaerythritol tetra (3-mercaptopropionate). TC of ELCM 1 and ELCM 2 reached 1.27 W·(m·K) −1 and 2.36 W·(m·K) −1 with 30 wt% content of Epoxy-LC 1 and Epoxy-LC 2 , which were 4.5 times and 8.43 times higher than that of pure epoxy polymer, respectively. Tensile strength and elongation at break of ELCM 1 and ELCM 2 were up to 8.1 MPa, 23 % and 23.8 MPa, 46.7 %, respectively. On the one hand, the favorable results are attributed to the molecular chains’ microscopic ordered arrangement by using high-voltage directional molding. On the other hand, the more important reason is that the hydrogen-bond interactions between −C=O and –OH of molecular chains in Epoxy-LC 2 and epoxy polymer. This work offers a new way to design flexible epoxy resins and intrinsic thermal conductive polymers.
研究领域:
材料科学
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热传导工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 44
·e53077
·
IF 3.057
Ying Li,Changdan Gong,Zhenzhong Hou,Wenying Zhou,Chao Liu,Longgui Peng,Yi Wu,Qin Shi,Qiwei Cheng
Flexible epoxy-dispersed liquid crystal membranes (EDLC- v membranes) with high thermal conductivity were successfully prepared by using of high voltage orientation molding. Liquid crystal monomer (LCM) was uniformly dispersed into flexible epoxy polymers cured by trimethylolpropane tris(3-mercaptopropionate) (TTMP) or pentaerythritol tetra(3-mercaptopropionate) (PETMP). In-plane thermal conductivity (TC // ) of EDLC- v membranes reached to 1.47 W m −1 K −1 with LCM content of 30 wt%, which was 5.65 times higher than that of epoxy polymers without LCM (0.26 W m −1 K −1 ). In addition, the tensile strength and elongation at break of EDLC- v membranes were up to 27.9 MPa and 92.8%, respectively. The main reasons for high TC // and flexibility of EDLC- v membranes are molecular chains' ordered arrangement, crosslinking in epoxy polymers, hydrogen bond interaction, and high voltage orientation molding. This work provided a new and feasible way to prepare intrinsic high thermal conductive polymer materials, as well as flexible epoxy polymers.
研究领域:
材料科学
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热传导工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 61
·期 7
·561-570
·
IF 3.046
Chuanwei Lu,Xinyu Wang,Wenhui Hua,Shan Wang,Shaojun Wang,Jifu Wang,Qiang Yong,Fuxiang Chu
Flexible epoxy thermosets have promising applications in modern industry. However, the development of next-generation flexible epoxy thermosets with high biomass content and multi-functions remains challenging. In this work, a sustainable cellulose/plant oil based flexible epoxy thermoset with excellent mechanical property, reprocessing performance, and UV absorption property was prepared. First, the amino cellulose is synthesized and used as a reinforcement and curing agent, and then the flexible epoxy thermoset is prepared by curing reaction of amino cellulose, citric acid, and flexible epoxy resin using zinc acetylacetonate as the transesterification catalyst. The epoxy thermosets show excellent thermal stability, the temperature at maximum weight loss reached 425°C. Mechanical property tests indicate that these thermosets have high mechanical strength (19.6 MPa) and satisfactory stretchability (36.1%–118%). The dynamic transesterification ester groups endow the epoxy thermoset with reprocessing ability. In addition, these epoxy thermosets show outstanding and stable UV absorption properties even after long-time UV-light irradiation or heating treatment, which makes these flexible epoxy thermosets have promising applications in UV-blocking coating. Graphical
研究领域:
材料科学
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化学工程
·
可持续材料
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Kai Yang,Yueshan Huang,Charles Amanze,Liyi Yao,Richmond Anaman,Bin Huang,Weimin Zeng
The access to the enantiopure noncanonical amino acid l-phosphinothricin (l-PPT) by applying biocatalysts is highly appealing in organic chemistry. In this study, a NADH-dependent glutamate dehydrogenase from Lachnospiraceae bacterium (LbGluDH) was chosen for the asymmetric synthesis of l-PPT. Three flexible loops undergoing big conformational shifts during the catalysis were identified and rationally engineered following the initial mutagenesis. The enzyme’s specific activity toward the key precursor of l-PPT, 2-oxo-4-[(hydroxy) (methyl) phosphinyl] butyric acid (PPO), was improved from negligible to 9 U/mg, and the Km value was reduced to 17 mM. The computational analysis showed that the modified loops broadened the enzyme’s narrow tunnels, allowing the substrate to access the binding pocket and get closer to the crucial residue D165, thereby enhancing the catalytic process. Utilizing the variant as the catalyst, the preparation of l-PPT achieved a 100% conversion rate within 60 min, coupled with a stereoselectivity exceeding 99.9%, demonstrating its practical capacity for industrial application. Similar enhancement in catalytic activity was obtained applying the same strategy to a typical NADH-dependent GluDH from Pyrobaculum islandicum (PisGluDH), indicating the effectiveness of our strategy for the protein engineering of GluDHs targeted to the biosynthesis of unnatural compounds.
研究领域:
生物化学
·
生物技术
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有机化学
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酶学
·
蛋白质工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2025
·Vol. 13
·期 9
·3023-3031
·
IF 5.7
Jiaqi Wu,Yichi Zhang,Yue Liu,Yuanyuan Zheng,Kailiang Xu,Peining Chen,Huisheng Peng
Acoustic matching layers play an important role in ultrasonic transducers. However, the acoustic matching layer with both intrinsic flexibility and high acoustic impedance remains an unmet need to achieve high-performing flexible ultrasonic transducers. Herein, we present an epoxy/nano-zirconia composite with excellent flexibility and acoustic performance by the chemical coupling method. (3-Aminopropyl)triethoxysilane was used to effectively disperse nano-zirconia particles in epoxy resin, and endow the resultant composite with flexibility. After carefully adjusting the additions of nano-zirconia particles and (3-aminopropyl)triethoxysilane, the modulus of the epoxy/nano-zirconia composite was 4.5 MPa, combined with an elongation at break over 90%. The acoustic impedance of the epoxy/nano-zirconia composite (∼4.5 MRayl) exceeded that of other typical polymer counterparts. The flexible acoustic matching layer based on an epoxy/nano-zirconia composite could significantly improve the sensitivity and bandwidth of ultrasonic transducers. A fiber-shaped ultrasonic transducer with high sensitivity and wide bandwidth was fabricated, displaying promising application potential in wearable medical electronics.
研究领域:
材料科学
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声学
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纳米技术
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生物医学工程
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高分子科学
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）