Self-healing materials can recover the materials from physical damage, and extend the life of equipment. Metal coordination bonds are supramolecular interactions with tunable stability and sensitivity to external stimuli, which are crucial for developing self-healing materials. Incorporating metal coordination bonds into elastomers and coatings can enable materials to repair damage and enhance material performance. This review details the advance in self-healing elastomers and coatings. The structural characteristics, mechanical properties, and self-healing efficacy of these materials are discussed, and a perspective on the challenges and development directions is given.
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http://dx.doi.org/10.1002/chem.202404038 | DOI Listing |
Polymers (Basel)
January 2025
Guangdong Engineering Technology Research Center of Small Household Appliances Innovation Design and Manufacturing, School of Mechanical Engineering, Guangdong Ocean University, Zhanjiang 524088, China.
During the production of medical thin-walled tubes, a thin coating layer is required. This requirement reduces the cross-sectional clearance area of the straight section flow channel formed by the mandrel and the die, leading to excessive pressure of the polymer melt at the shaping section, elevated die pressure, and backflow of the material melt, all of which directly impact the quality of the coating layer. To address these issues, this study conducted a non-isothermal numerical simulation of coating models both with and without a shaping section.
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December 2024
Centre of Nanoheterostructure Physics, Ioffe Institute, Saint Petersburg 194021, Russia.
The paper presents a review of CNTs synthesis methods and their application as a functional filler to obtain polymer composites for various technical purposes for strain gauges, electrical heating, anti-static coatings, electrically conductive compounds, etc. Various synthesis methods allow CNTs with different morphology and structural properties to be created, which expands the possibilities of the application of such nanoscale structures. Polymers can provide such effects as 'shape memory' and self-repair of mechanical defects.
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December 2024
School of Mechanical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
This work introduces an ultraviolet (UV)-curable elastomer through the co-polymerization of aliphatic polyurethane acrylate and hydroxypropyl acrylate via UV irradiation. The UV-curable elastomer presents superior mechanical properties (elongation at a break of 2992%) and high transparency (94.8% at 550 nm in the visible light region).
View Article and Find Full Text PDFOper Dent
January 2025
*Roberta Tarkany Basting, DDS, MSc, PhD, Professor, Restorative Dentistry Department, Faculdade São Leopoldo Mandic, São Paulo, Brazil.
This study evaluated the influence of six resin composite coating agents on color stability and surface roughness after toothbrushing abrasion. Discs (Ø6 mm x 2 mm) of nanofilled resin composite (Filtek Z350XT) were prepared for application of coating agents (n=10): control (absence), two surface sealants (PermaSeal and BisCover LV), two adhesive systems (Scotchbond Multi-Purpose Adhesive/3M Oral Care and Single Bond Universal), and two modeling liquids (Modeling Resin and Composite Wetting Resin). CIELab*, WID, and color change (ΔEab, ΔE00, and ΔWID) were analyzed at baseline, after finishing and polishing, after application of coating agents, after coffee staining (simulating 30 days and one year of staining), and after toothbrushing abrasion.
View Article and Find Full Text PDFChemistry
January 2025
Key lab of organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, China.
Self-healing materials can recover the materials from physical damage, and extend the life of equipment. Metal coordination bonds are supramolecular interactions with tunable stability and sensitivity to external stimuli, which are crucial for developing self-healing materials. Incorporating metal coordination bonds into elastomers and coatings can enable materials to repair damage and enhance material performance.
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