Citation: YANG Muquan, XIAO Lingyu, ZHANG Xuan, YAN Yue. Fabrication of Poly(4-Vinylpyridine-b-Polyethylene Glycol) Diblock Copolymer Brushes from Au Surfaces and Their pH Responsive Behavior[J]. Chinese Journal of Applied Chemistry, ;2019, 36(4): 431-439. doi: 10.11944/j.issn.1000-0518.2019.04.180360 shu

Fabrication of Poly(4-Vinylpyridine-b-Polyethylene Glycol) Diblock Copolymer Brushes from Au Surfaces and Their pH Responsive Behavior

YANG Muquan ^a ,
XIAO Lingyu ^b ,
ZHANG Xuan ^a ,
YAN Yue ^a,,

a.
Beijing Engineering Research Centre of Advanced Structure Transparencies for the Modern Traffic System, Beijing Institute of Aeronautical Materials, Beijing 100095, China
b.
College of Chemistry, Jilin University, Changchun 130012, China

Corresponding author: YAN Yue, yue.yan@biam.ac.cn
Received Date: 9 November 2018
Revised Date: 4 January 2018
Accepted Date: 23 January 2018

Fund Project: the National Natural Science Foundation of China 51702305Supported by the National Natural Science Foundation of China(No.51702305)

Figures(8)

As a classical model of confined polymer systems, polymer brushes have potential applications in colloid stability, polymer self-assembly, tribology, and so on. We present herein a combination of atom transfer radical polymerization(ATRP) and click chemistry method to synthesize pH-responsive poly(4-vinylpyridine-b-polyethylene glycol)(P4VP-b-PEG) block polymer brushes on gold(Au) substrates. The changes of the morphologies, surface chemical composition and surface roughness of the as-prepared Au/P4VP-b-PEG polymer brushes treated by different pH solutions were further studied by frequency-dissipation quartz microbalance(QCM-D), X-ray photoelectron spectroscopy(XPS) and atomic force microscopy(AFM), respectively. The results showed that P4VP-b-PEG block polymer brushes treated with different pH solutions exhibited stimuli-response behaviors. At pH=1.5, the P4VP segment was protonated, and the P4VP-b-PEG chain exhibited stretching conformation due to electrostatic repulsion. At pH=11.5, the P4VP segment was deprotonated, and the P4VP-b-PEG segment collapsed due to the loss of partial binding water.
- polymer brush,
- stimuli responsive,
- atom transfer radical polymerization,
- click chemistry
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