pH-responsive disruption of 'liquid marbles' prepared from water and poly(6-(acrylamido) hexanoic acid)-grafted silica particles

被引：44
作者：
Inoue, Masamichi [1 ]
Fujii, Syuji [2 ]
Nakamura, Yoshinobu [2 ]
Iwasaki, Yasuhiko [3 ]
Yusa, Shin-ichi [1 ]
机构：
[1] Univ Hyogo, Dept Mat Sci & Chem, Himeji, Hyogo 6712280, Japan
[2] Osaka Inst Technol, Dept Appl Chem, Osaka 535, Japan
[3] Kansai Univ, Fac Chem Mat & Bioengn, Osaka, Japan
来源：
POLYMER JOURNAL | 2011年 / 43卷 / 09期
关键词：
controlled radical polymerization; graft; liquid marble; pH-responsive polymer; LATEX-PARTICLES; EMULSIONS; POLYMERS; LAYERS;
D O I：
10.1038/pj.2011.55
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A chain transfer agent was immobilized onto the surface of 11-mu m diameter silica particles (CPD-SiO2) for use in reversible addition-fragmentation chain transfer (RAFT)-controlled radical polymerization. pH-responsive poly(6-(acrylamido) hexanoic acid) (PAaH)-grafted silica particles (PAaH-SiO2) were prepared via RAFT-controlled radical polymerization using CPD-SiO2. Immobilization of the PAaH chains onto the surface of silica particles was confirmed by thermogravimetric analysis, attenuated total reflection-Fourier transfer infrared and scanning electron microscopy measurements. The solubility of PAaH in water is strongly dependent on the pH of the solution. PAaH-SiO2 was flocculated at pH 3 because of the hydrophobic interaction of the grafted PAaH chains with protonated carboxyl pendant groups. In contrast, PAaH-SiO2 was dispersed at pH 10 because of electrostatic repulsion between the grafted PAaH chains with pendant carboxylate ions. Millimeter-sized 'liquid marbles' can be prepared using the pH-responsive PAaH-SiO2 particles. The 'liquid marble' can be transferred intact onto the surface of a neutral or acidic water pool and exhibit long-term stability. When the pH of the water pool becomes alkaline, the 'liquid marble' immediately bursts on the surface of the water pool. Polymer Journal (2011) 43, 778-784; doi: 10.1038/pj.2011.55; published online 22 June 2011
引用
收藏
页码：778 / 784
页数：7
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