کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
232180 1427469 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrophobic ion pairing to enhance encapsulation of water-soluble additives into CO2-swollen polymer microparticles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Hydrophobic ion pairing to enhance encapsulation of water-soluble additives into CO2-swollen polymer microparticles
چکیده انگلیسی

Ionic dyes were successfully encapsulated in colloidal polymer particles by a CO2-based microencapsulation technique. The water-soluble dyes were made hydrophobic by forming ion pairs with several types of alkyl quaternary ammonium cations. The hydrophobic ion pairs were then encapsulated in preexisting size monodisperse polystyrene particles dispersed in water. High-pressure carbon dioxide swelled and plasticized polystyrene and thus facilitated mass transport of the dye into the particles. The results show that the particles maintain their size and morphology after exposure to CO2, and that ion-paired dyes have significantly higher loading in the polymer particles than the original dyes. The effects of cosolvent and surfactant are also discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 41, Issue 2, June 2007, Pages 293–298
نویسندگان
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