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. 2020 May 20;8:394. doi: 10.3389/fchem.2020.00394

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Copyright © 2020 Yan, Liu, Zhang and Han.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Normalized UV-vis absorption spectra of blend in chloroform solution (concentration is 0.1 mg/ml). (B) The absorption intensity at 596 and 710 nm change with time at different N2200 MWs blend systems. (C) Summary of the start time (t_s) and the entire time (Δt = t_e-t_s) of the second stage in solvent evaporation.