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Issue 4, 2016
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Synthesis of photoresponsive polymeric propesticide micelles based on PEG for the controlled release of a herbicide

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Abstract

A novel amphiphilic polymer–pesticide conjugate was synthesized by conjugation of PEG with the photolabile o-nitrobenzyl group followed by grafting dichlorophenoxyacetic acid (2,4-D), which can self-assemble into photoresponsive micelles in aqueous solutions for a controlled release of the herbicide. 1H NMR and FT-IR confirmed the structure of the synthesized conjugate. TEM observations showed that the micelles had a core–shell configuration. DLS and TEM measurements showed that the average diameters of the micelles decreased by about 40 nm after 365 nm UV irradiation. 1H NMR and UV-Vis studies confirmed that the photoresponse may be ascribed to the photolytic cleavage of o-nitrobenzyl as the connecting arm in the polymeric chain. No release of the micelles was detected without light, while the cumulative release rate from the micelles increased gradually upon solar-simulating radiation, reaching 99.6% in 8 h.

Graphical abstract: Synthesis of photoresponsive polymeric propesticide micelles based on PEG for the controlled release of a herbicide

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Supplementary files

Article information


Submitted
19 Oct 2015
Accepted
02 Dec 2015
First published
03 Dec 2015

Polym. Chem., 2016,7, 899-904
Article type
Paper

Synthesis of photoresponsive polymeric propesticide micelles based on PEG for the controlled release of a herbicide

K. Ding, L. Shi, L. Zhang, T. Zeng, Y. Yin and Y. Yi, Polym. Chem., 2016, 7, 899
DOI: 10.1039/C5PY01690H

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