期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 51, 页码 18688-18697出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b10901
关键词
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资金
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [ER45852]
- DOE
- Simons Foundation
- Swiss National Science Foundation
- Fonds de Recherche Nature et Technologies
- Gates Foundation
- NSF [CHE-1506993]
This work describes the development of magnetic levitation (MagLev) to characterize the kinetics of free-radical polymerization of water insoluble, low-molecular-weight monomers that show a large change in density upon polymerization. Maglev measures density, and certain classes of monomers show a large change in density when monomers covalently join in polymer chains. MagLev characterized both the thermal polymerization of methacrylate-based monomers and the photopolymerization of methyl methacrylate and made it possible to determine the orders of reaction and the Arrhenius activation energy of polymerization. MagLev also made it possible to monitor polymerization in the presence of solids (aramid fibers, and carbon fibers, and glass fibers). MagLev offers a new analytical technique to materials and polymer scientists that complements other methods (even those based on density, such as dilatometry), and will be useful in investigating polymerizations, evaluating inhibition of polymerizations, and studying polymerization in the presence of included solid materials (e.g., for composite materials).
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