Fluorescence-based self-diagnosis of hyperbranched polyethyleneimine oxidation
He Zhou,
Qingxin Yang,
Fengniu Lu,
Jiaojiao Zheng,
Zhiqin Yuan,
Chao Lu
Affiliations
He Zhou
State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
Qingxin Yang
State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
Fengniu Lu
Department of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
Jiaojiao Zheng
State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
Zhiqin Yuan
State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China; Corresponding authors at: State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China.
Chao Lu
State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China; Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001,China
Polymer oxidation affects the molecular structure and decides the performances, making its rapid and sensitive diagnosis important for evaluating the state of polymer materials and predicting its service life. In this study, fluorometric analysis of the oxidation of hyperbranched polyethyleneimine is realized by Schiff-base reaction. The sensing mechanism is due to the oxidation-mediated generation of oxygen-containing groups, which react with residual primary amine and produce fluorescent Schiff-base compounds. Four hPEIs with different molecular weight possess similar fluorescence variation during oxidation, demonstrating the universality of the proposed technique. Moreover, the successful quality assessment of hPEI verifies the practical application of the proposed fluorescence-based self-diagnosis technique.
