Materials Horizons
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2022
·Vol. 10
·期 3
·908-917
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IF 15.717
Hong-Qin Wang,Zi-Yang Huang,De-Wei Yue,Fang-Zhou Wang,Cheng-Hui Li
Pneumatic-powered actuators are receiving increasing attention due to their widespread applications. However, their inherent low stiffness makes them incompetent in tasks requiring high load capacity or high force output. On the other hand, soft pneumatic actuators are susceptible to damage caused by over-pressuring or punctures by sharp objects. In this work, we designed and synthesized a coordination adaptable network (PETMP-AIM-Cu) with high mechanical rigidity (Young's modulus of 1.9 GPa and elongation <2% before fracturing) as well as excellent variable stiffness property (soft-rigid switching ability σ as high as 3 268 000 when ΔT = 90 °C). Combining PETMP-AIM-Cu with a self-healing elastomer based on dynamic disulfide bonds (LP-PDMS), we fabricated a new pneumatic actuator which shows high load capacity at room temperature, but can also easily deform upon heating and thus can be actuated pneumatically. Benefiting from the excellent self-healing ability of PETMP-AIM-Cu and LP-PDMS, the entire pneumatic actuator can still be actuated after being cut and healed. Such a variable-stiffness and healable pneumatic actuator would be useful for complex environmental applications.
研究领域:
材料科学
·
机器人学
·
机械工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Coatings Technology and Research
·
2025
·
IF 2.8
Su Xinyong,Wang Jinwei,Zheng Caiyuan,Tang Can,Li Xueguo
Fast UV-curable coatings were prepared through thiol-ene reaction in 10 s, and their waterproof performance was evaluated in different aqueous conditions. The FTIR spectra showed that UV polybutadiene (PB) coatings could be successfully prepared by using mercaptan pentaerythritol tetra (3-mercapto propionate) (PETMP) as the crosslinking agent reacting with maleic anhydride-grafted polybutadiene under photo initiator. Their gel content increased from about 78–92% with the addition of PETMP from 10% to 20%, and then, this increment was less than 2% with the addition of PETMP from 20% to 30%. Their water absorption rate decreased from about 7%–4% with the addition of PETMP up to 20%−25% after 240 h immersion in DI water. The coating containing 25% PETMP demonstrated a significant cleanliness relative to that of plywood and the other coatings as observed from the stain flushing test. The EIS impedance after 96 h immersion revealed a great enhancement in corrosion resistance with the addition of PETMP at about 20%–25%, while the decline in impedance for the coating with 30% PETMP implied the probable aggregation of excessive PETMP; these were confirmed by the semi-immersion test in which the sample containing 20% PETMP exhibited much better salt water resistance than that of the other samples after 168 h immersion in 3.5% NaCl solution. An appropriate addition of PETMP at around 20%–25% resulted in a high crosslinking degree that enhanced waterproof performances of UV-cured PB coatings in DI water, stain water, and salt water. This study provides valuable reference in designing fast UV-curable coatings with good water resistance used as electronic packaging sealants, flexible protective coatings, and so on.
研究领域:
高分子材料科学
·
表面与界面化学
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防腐工程
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功能涂层
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROPHORESIS
·
2017
·
IF 2.744
Jiao Zeng,Shengquan Liu,Menglin Wang,Shouzhuo Yao,Yingzhuang Chen
In this work, a porous structure and good permeability monolithic column was polymerized in UV transparent fused-silica capillaries via photo-initiated thiol-ene click polymerization of 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane (TMTVS), pentaerythritol tetra(3-mercaptopropionate)(PETMP), itaconic acid, respectively, in the presence of porogenic solvents (tetrahydrofuranand methanol) and an initiator (2,2-dimethoxy-2-phenylacetophenone) (DMPA) within 30 min. The physical properties of this monolith were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and nitrogen adsorption/desorption measurements. For an overall evaluation of the monolith in chromatographic application, separations of polycyclic aromatic hydrocarbons (PAHs), phenols, amides and bases were carried out. The column efficiency of this monolith could be as high as 112 560 N/m. It also possesses a potential application in fabrication of monoliths with high efficiency for c-LC. In addition, the resulting monolithic column demonstrated the potential use in analysis of environment waters.
研究领域:
分析化学
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
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2019
·
IF 3.42
Daidong Wei,Bing Liao,Jianheng Huang,Min Zhang,Hao Pang
Thiol-ene click reactions are more oxygen tolerant alternative to the conventional (meth)acrylate chemistry that is frequently used for the rapid production of photopolymerized networks with numerous desirable properties. To attain a high curing efficiency while maintaining the advantages of thiol-ene systems, a castor oil-based hyperbranched urethane acrylate was employed in this work as a primary oligomer for UV-curable coating formulation. Subsequently, a tetrathiol monomer (PETMP) was introduced into the coating formulation to obtain a thiol-ene system. The effects of PETMP loadings on the UV-curing kinetics and final polymer properties were systematically investigated. Consequently, thiol-ene based films with excellent flexibility and water resistance were obtained as a result of the high efficient thiol-ene photopolymerization. The double bond conversion of the thiol-ene system was found to increase with the addition of more PETMP. Impressively, with the incorporation of 5 wt% PETMP, the resultant UV-cured film had the best acid resistance and exhibited a double bond conversion of 93.6%, a pencil hardness of 6H, a water absorption of 0.76%. Additionally, all of the prepared films were completely transparent and possessed good microstructures. These thiol-ene based films may provide insight into the preparation of high-performance UV-curable coatings with excellent flexibility.
研究领域:
材料科学
·
高分子化学
·
涂料技术
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Kai Chen,Yuxue Sun,Chen Zhao,Yingjie Yang,Xiaorong Zhang,Jun Liu,Haiming Xie
Solid polymer electrolytes (SPEs) are currently attracting widespread interest for lithium battery applications due to high safety, low volatility, and the ability to suppress Li dendrites. Herein, a novel all-solid-state polymer electrolyte with semi-interpenetrating network (semi-IPN) structure has been prepared. The semi-IPN SPE is fabricated by thiol-tosylate polycondensation of pentaerythritol terakis (3-mercaptopropionate) (PETMP) with non-self-polymerized precursors, ditosylate poly (ethylene glycol) (DTsPEG) and p -toluenesulfonyl poly (ethylene glycol) methyl ether (TsPEGME), and then blended with a high molecular weight polyethylene oxide (PEO, M w = 300 kg mol −1 ). The resulting self-standing membrane achieves an excellent ionic conductivity (1.3 × 10 −4 S cm −1 ) at ambient temperature, and exhibits an electrochemical stability window up to 4.3 V vs. Li/Li + . The LiFePO 4 /semi-IPN-SPE/Li battery exhibits a first discharging capacity of 143.1 mA h g −1 at 0.2C and the discharge capacity keeps 134 mA h g −1 after 100 charge and discharge cycles.
研究领域:
材料科学
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电化学
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电池技术
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聚合物化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）