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Title: Imaging chemical kinetics of radical polymerization with an ultrafast coherent Raman microscope
Authors: Li, Haozheng
Cheng, Yong
Tang, Huajun
Bi, Yali
Chen, Yage
Yang, Guang
Guo, Shoujing
Tian, Sidan
Liao, Jiangshan
Lv, Xiaohua
Zeng, Shaoqun
Zhu, Mingqiang
Xu, Chenjie
Cheng, Ji-Xin
Wang, Ping
Keywords: Engineering::Bioengineering
Issue Date: 2020
Source: Li, H., Cheng, Y., Tang, H., Bi, Y., Chen, Y., Yang, G., . . . Wang, P. (2020). Imaging chemical kinetics of radical polymerization with an ultrafast coherent Raman microscope. Advanced Science, 7(10), 1903644-. doi:10.1002/advs.201903644
Journal: Advanced Science 
Abstract: 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.
ISSN: 2198-3844
DOI: 10.1002/advs.201903644
Schools: School of Chemical and Biomedical Engineering 
Rights: © 2020 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles

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