ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Yajie Zhang,Li Yuan,Guozheng Liang,Aijuan Gu
A bio-based tetrafunctional epoxy monomer containing a dicyclo diacetal linkage was successfully synthesized via acetalization of protocatechualdehyde (PCA) with erythritol, followed by a reaction with bioderived epichlorohydrin. The epoxy monomer exhibits good reactivity with glutaric anhydride in the presence of a zinc(II) acetylacetonate (ZAA) catalyst and can be cured using a medium-temperature procedure. The prepared epoxy vitrimer (DGZ) systems exhibit excellent mechanical and thermal properties resulting from the rigid dicyclo diacetal and aromatic structures and the high conversion of epoxy groups (αepoxy group). When the ZAA content is 2.5%, DGZ has optimal integrated mechanical properties, and its impact strength, tensile strength, and flexural strength can reach 20 kJ/m2, 60 MPa, and 119 MPa, respectively, which can be compared with those of the commercial bisphenol A epoxy resin cured with a high-temperature procedure. DGZ systems have a good glass-transition temperature (Tg) of 111–117 °C. The broad glass transition endows DGZ with a good shape memory effect. The introduction of dynamic ester bonds in DGZ brings good self-healing ability, welding ability, and rapid stress relaxation. The self-healing efficiency of the scratches on the surface of DGZ can reach ∼100% at 200 °C. Owing to the existence of dicyclo diacetal linkages, DGZ can be completely degraded in 0.1 and 1 M HCl solutions at 25–80 °C. DGZ also has good dielectric properties due to the rigid dicyclo diacetal and aromatic structures, as well as a high αepoxy group.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Puyou Jia,Yuxuan Shi,Fei Song,Yu Bei,Caoxing Huang,Meng Zhang,Lihong Hu,Yonghong Zhou
Bio-based polymer materials with multichannel self-healing ability as intelligent sensor have received significant attention. However, to date, study on bio-based vitrimer composites with multichannel self-healing ability as early temperature and fire warning sensors has never been reported. In this study, We prepared bio-based polyschiff vitrimers using vanillin and tung oil as raw materials, which possessed excellent self-healing and reprocessability. The electricity, heat and electromagnetic wave triggered self-healing of bio-based polyschiff vitrimers with graphene were achieved. A practicable strategy for fabricating bio-based via composite graphene oxide were developed as an efficient temperature warning sensor and fire warning sensor. These multifunctional bio-based polyschiff vitrimer composites developed could greatly promote its practical application in fire/high temperature prevention and protection applications in various critical fire risk and related perilous circumstances.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 4
·e6393
·
IF 3.1
Yang Xiong,Zihong Zhang,Ying Liu,Min Ye,Chengyao Hu,Jun Chen,Yawen Huang
It is still a big challenge to prepare superhydrophobic anti-icing coatings with long freeze delay performance and high durability. In this work, in different with conventional flexible porous coating, we prepared an asymmetric coating with hierarchical pocket structure by a facile hot-pressing/salt-leaching (BHS) method on a polyacrylate vitrimer polymer with mellability. The asymmetric architecture endowed porous coating with low density and high adhesion strength. The in-situ growth of silica nanoparticles in above porous coating and surface modification generated a superhydrophobic hierarchical pocket structure. As a result, the freezing delay time was drastically increased to 14,400 s at −10°C. Furthermore, owing to hierarchical pocket structure, the coating could maintain its superhydrophobicity and anti-icing performance under water flow impacting at 10 kPa pressure, 30 cycles of sandpaper abrasion, 50 cycles of tape peeling, showing advantageous high durability. By employing the hierarchical porous coating on heat exchangers, the energy consumption was drastically reduced by 93%.
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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 21
·10898-10908
·
IF 11.301
Chuanyin Xiong,Bingbing Li,Heguang Liu,Wei Zhao,Chao Duan,Haiwei Wu,Yonghao Ni
Wood-based materials are attracting extensive attention for applications in energy storage due to their environmental friendliness and the presence of numerous channels in their structure. However, the poor conductivity and flexibility of wood restrict its application. Although some researchers have made several efforts to improve the conductivity of wood by carbonization, the wood-based materials become brittle instead of flexible. Moreover, the cycling stability of carbonized wood-based materials becomes very poor due to their falling off during the process of electrochemical energy storage. Herein, for the first time, a smart carbonized lignin-free wood (CLFW)@Ni–NiS/vitrimer(V) composite multifunctional material with good reshaping, shape-memory, and self-healing properties was designed and fabricated. When assembled to a symmetric supercapacitor, the resultant CLFW@Ni–NiS/V hybrid showed not only the high gravimetric, areal, and volumetric energy densities of 38 W h kg−1, 687 μW h cm−2, and 58 W h L−1 and simultaneously maintained the high power densities of 56 kW kg−1, 202 mW cm−2, and 39 kW L−1, but also significantly enhanced cycling stability, respectively. In addition, CLFW@Ni–NiS/V presented good ORR and strain sensor properties. These outstanding advantages highlight the huge potential of smart wood-based materials with variable, shape-memory, and self-healing properties for applications in supercapacitors, catalysts, and sensors.
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高影响因子
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