کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
230803 1427399 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exploiting the homogeneous expansion limit of CO2-expanded media for the synthesis of polymeric nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Exploiting the homogeneous expansion limit of CO2-expanded media for the synthesis of polymeric nanoparticles
چکیده انگلیسی


• Novel method for the direct synthesis of polymeric nanoparticles based on the CO2-expanded liquid concept.
• Polymerization at the homogeneous expansion limit leads to well defined polymeric nanoparticles with diameters of around 100 nm.
• The polymeric nanoparticles are generally smaller and more uniform in size than those obtained in the corresponding CO2-free approach.

This paper describes a novel method for the direct synthesis of polymeric nanoparticles based on the CO2-expanded liquid concept. This technique exploits the anti-solvent effect of dense CO2 to induce an emulsion in a polymer solution at a point known as the homogeneous expansion limit (HEL). Polymerization is carried out in the dispersed phase which consists mainly of polymer and monomer. Herein, we report on nanoparticle formation via polymerization of methyl methacrylate using a macroazoinitiator in CO2-expanded ethanol at 70 °C and 10 MPa. It is shown that polymerization at the HEL leads to well defined polymeric nanoparticles with diameters of around 100 nm. The nanoparticles are generally smaller and more uniform in size than those obtained in the corresponding CO2-free approach (dispersion polymerization).

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 78, June 2013, Pages 89–94
نویسندگان
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