Citation: Yuan-yuan Ju, Guang-da Han, Yan Lu, Han-ying Zhao. Fabrication of Mesoporous Polymeric Micelles and Their Application in Hg²⁺ Detection[J]. Acta Polymerica Sinica, ;2018, 0(8): 1081-1088. doi: 10.11777/j.issn1000-3304.2018.18009 shu

Fabrication of Mesoporous Polymeric Micelles and Their Application in Hg²⁺ Detection

1.
Key Laboratory of Functional Polymer Materials, Ministry of Education, College of Chemistry, Nankai University, Tianjin 300071
2.
School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384

Corresponding author: Han-ying Zhao, hyzhao@nankai.edu.cn
Received Date: 8 January 2018
Revised Date: 28 February 2018

Amphiphilic macromolecular brushes with pH-responsiveness and reduction responsiveness were synthesized by reversible addition-fragmentation chain transfer polymerization and atom transfer radical polymerization. The side chains of the brush polymers were covalently connected to the backbones through redox-responsive disulfide bonds. The structure, molecular weight and molecular weight distribution of the brush polymers were characterized by ¹H-NMR and gel permeation chromatography. At pH = 10.0, the amphiphilic brush polymers self-assembled into multi-component micelles with POEGMA shells and PtBMA/PDMAEMA cores. In the cores, the two hydrophobic blocks segregated into distinct domains due to their incompatibility, and the hydrophilic POEGMA blocks formed the coronae to stabilize the structures. The PtBMA chains with larger volume percentage formed the continuous phases, while the PDMAEMA chains with smaller volume percentage formed the discontinuous phases. At pH = 4.0, protonated PDMAEMA chains were highly stretched and formed the coronae of the micelles. Excessive reductant was added into the micellar solution to reduce the disulfide bonds between PDMAEMA side chains and the backbones, and mesoporous polymeric micelles with thiol groups inside the pores were obtained. ¹H-NMR results of multi-component micelles, before and after treatment with the reductant, indicated that the PDMAEMA side chains were removed completely. Transmission electron microscopy (TEM) and dynamic light scattering were used to characterize the morphology and the size of the micelles. Based on TEM results, the average size of the pores in the micelles was about 2 nm, which was consistent with the average size of the PDMAEMA discontinuous phases. After the cleavage of the disulfide bonds and the removal of PDMAEMA chains from the micelles, thiol groups were produced on the walls of the pores. The thiol groups can be used as reducing agent and stabilizer in the in situ synthesis of gold nanoparticles. By thiol-bromine reactions, mesoporous micelles with polythiophene derivatives inside the pores were synthesized. The micelles showed high sensitivity and excellent selectivity for Hg²⁺.
- Multicomponent micelle,
- Mesoporous micelles,
- Thiol-bromo reaction,
- Hg²⁺ Detection
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Fabrication of Mesoporous Polymeric Micelles and Their Application in Hg2+ Detection

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通讯作者: 陈斌, bchen63@163.com

Fabrication of Mesoporous Polymeric Micelles and Their Application in Hg²⁺ Detection