کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
175797 458921 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Light and temperature responsive block copolymer assemblies with tunable fluorescence emissions
ترجمه فارسی عنوان
مجموعه های کوپلیمر بلوک واکنش با نور و دما با انتشار فلوئورسانت قابل تنظیم
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Photo and temperature responsive amphiphilic diblock copolymer was successfully prepared.
• The fluorescence of the polymeric assemblies could be efficiently modulated by a photochromic naphthopyran and temperature.
• Such polymeric assemblies could be used as sensitive ratiometric fluorescent thermometers.

A dual-responsive amphiphilic diblock copolymer, poly(styrene-co-1-(2-methacryloxyethoxy)-2-(2-pyridyl)benzimidazole)-block-Poly(N-isopropylacrylamide-co-3-biphenyl-3-phenyl-8-methacryloxy-3H-naphtho[2,1-b]pyran-co-4-methamino-9-allyl-1,8-naphthalimide), also denoted as P(St-co-PBI)-b-P(NIPAM-co-NP-co-MANI), was synthesized by reversible addition fragmentation chain transfer polymerization followed by assembling into micelles with hydrophobic P(St-co-PBI) block as core and thermoresponsive P(NIPAM-co-NP-co-MANI) block as the shell in aqueous solution. Dynamic light scattering, transmission electron microscopy and optical transmittance were used to characterize the particle morphology and thermosensitivity of the micelles solution. In addition, the fluorescence emission of the micelles could be reversibly modulated “on” and “off” by the photochromic naphthopyran upon UV and thermal back reaction, which promoted naphthopyran transformation between merocyanine forms and original closed form. Moreover, the spatial distance between the two fluorescence dyes could be regulated by temperature, resulting from the collapse or extension of PNIPAM in aqueous solution. This property enabled the polymeric assemblies to serve as sensitive ratiometric fluorescent thermometers.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dyes and Pigments - Volume 117, June 2015, Pages 92–99
نویسندگان
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