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

doi:10.11944/j.issn.1000-0518.2019.04.180360

Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (4): 431-439.DOI: 10.11944/j.issn.1000-0518.2019.04.180360

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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^*()

^aBeijing Engineering Research Centre of Advanced Structure Transparencies for the Modern Traffic System,Beijing Institute of Aeronautical Materials,Beijing 100095,China
^bCollege of Chemistry,Jilin University,Changchun 130012,China

Received:2018-11-09 Accepted:2018-01-23 Published:2019-04-01 Online:2019-04-02
Contact: YAN Yue
Supported by:
Supported by the National Natural Science Foundation of China(No.51702305)

Abstract

Abstract:

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.

Key words: polymer brush, stimuli responsive, atom transfer radical polymerization, click chemistry

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.

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

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