Stress Relaxation via Covalent Dynamic Bonds in Nanogel-Containing Thiol-Ene Resins
| Autor: | Jeffrey W. Stansbury, Xun Han, Xinpeng Zhang, Mingtao Chen, Parag K. Shah, Guangzhe Gao, Nancy Sowan, Christopher N. Bowman |
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| Rok vydání: | 2022 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Organic Chemistry Network structure 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Inorganic Chemistry chemistry Covalent bond Polymer chemistry Materials Chemistry Stress relaxation Thiol Polymer composites 0210 nano-technology Allyl Sulfide Ene reaction Nanogel |
| Zdroj: | ACS macro letters. 9(5) |
| ISSN: | 2161-1653 |
| Popis: | Functional nanogels are attractive additives for use in polymer composites. In this study, nanogels with internal allyl sulfide moieties throughout their network structure were prepared via a thiol-Michael addition reaction. The excess thiol-functionalized nanogels were less than 60 nm as discrete particles but act as room-temperature liquids in the bulk state. The reactive nanogels can be dispersed in and swollen by a thiol-ene matrix resin, which upon photopolymerization yields dramatically decreased levels of polymerization shrinkage stress. Furthermore, the postcured nanogel-modified polymers effectively relaxed applied stresses as well as enhanced toughness during exposure to a UV light source that activated the addition-fragmentation as a means for dynamic bond exchange. These nanogels provide a generic approach to introduce adaptable network performance that significantly improves a number of key properties of glassy cross-linked polymer. |
| Databáze: | OpenAIRE |
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