کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1402078 | 984743 | 2010 | 9 صفحه PDF | دانلود رایگان |

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-cross-linking 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 1H NMR spectroscopy measurements, respectively.
Figure optionsDownload as PowerPoint slide
Journal: European Polymer Journal - Volume 46, Issue 11, November 2010, Pages 2120–2128