Preparation of reversibly photo-cross-linked nanogels from pH-responsive block copolymers and use as nanoreactors for the synthesis of gold nanoparticles

被引：55
|
作者：
Jin, Qiao [1 ]
Liu, Gongyan [1 ]
Li, Jian [1 ]
机构：
[1] Zhejiang Univ, Dept Polymer Sci & Engn, MOE Key Lab Macromol Synth & Functionalizat, Hangzhou 310027, Peoples R China
来源：
EUROPEAN POLYMER JOURNAL | 2010年 / 46卷 / 11期
关键词：
Photo-cross-linking; Nanogel; Nanoreactor; Micelle; Gold nanoparticles; AMORPHOUS CALCIUM-CARBONATE; CATALYTIC-ACTIVITY; PLATINUM NANOPARTICLES; MICELLES; TEMPLATES; MINERALIZATION; NANOSTRUCTURES; HOMOPOLYMERS; MICROGELS; POLYMERS;
D O I：
10.1016/j.eurpolymj.2010.09.001
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Reversibly photo-cross-linkable pH-responsive block copolymer poly(ethylene oxide)-b-poly((2-(diethylamino)ethyl methacrylate-co-4-methyl-[7-(methacryloyl)oxyethyloxy]coumarin))(PEO-b-P(DEA-co-CMA)) was synthesized via atom transfer radical polymerization (ATRP) Block copolymer nanogels could be easily prepared by first photo-cross-linking of the micelles at pH > 7 and then adjusting the solution to pH < 7 The photo-crosslinking was proved to be reversibly controlled under alternative irradiation of UV light at 365 nm and 254 nm As a result the cross-linking degrees and sizes of the nanogels can be easily controlled by alternatively UV light irradiation Finally the nanogels can serve as nanoreactors for the synthesis of gold nanoparticles The protonated DEA units were first coordinated with HAuCl4 and then the electrostatically bounded AuCl4- anions were reduced to gold nanoparticles by NaBH4 The nanogel-supported gold nanoparticles were used in chemical catalysis The pH-responsive photo-cross-linked nanogels have been characterized using dynamic light scattering transmission electron microscopy UV-vis spectra and H-1 NMR spectroscopy measurements respectively (C) 2010 Elsevier Ltd All rights reserved
引用
收藏
页码：2120 / 2128
页数：9
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