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Imaging Chemical Kinetics of Radical Polymerization with an Ultrafast Coherent Raman Microscope
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Imaging Chemical Kinetics of Radical Polymerization with an Ultrafast Coherent Raman Microscope
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Journal Article
Imaging Chemical Kinetics of Radical Polymerization with an Ultrafast Coherent Raman Microscope
2020
Overview
Numerous mechanisms have been proposed for polymerization to provide qualitative and quantitative prediction of how monomers spatially and temporally arrange into the polymeric chains. However, less is known about this process at the molecular level because the ultrafast chemical reaction is inaccessible for any form of microscope so far. Here, to address this unmet challenge, a stimulated Raman scattering microscope based on collinear multiple beams (COMB‐SRS) is demonstrated, which allows label‐free molecular imaging of polymer synthesis in action at speed of 2000 frames per second. The field of view of the developed 2 kHz SRS microscope is 30 × 28 µm2 with 50 × 46 pixels and 7 µs dwell time. By catching up the speed of chemical reaction, COMB‐SRS is able to quantitatively visualize the ultrafast dynamics of molecular vibrations with submicron spatial resolution and sub‐millisecond temporal resolution. The propagating polymer waves driven by reaction rate and persistent UV initiation are observed in situ. This methodology is expected to permit the development of novel functional polymers, controllable photoresists, 3D printing, and other new polymerization technologies. An ultrafast collinear multiple beam‐based stimulated Raman scattering microscope is developed to achieve direct imaging and quantification of polymerization kinetics in situ. By label‐free and molecular imaging of the polymerization process in action at a frame rate of 2 kHz, the polymer wave is observed, which is actually driven by radicals persistently generated in the UV initiation center.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
