کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5191637 | 1381236 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Self-assembly of C60 containing poly(methyl methacrylate) in ethyl acetate/decalin mixtures solvent
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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چکیده انگلیسی
[60]Fullerene (C60) was mono-substituted with well-defined poly(methyl methacrylate) (PMMA-b-C60) using the atom transfer radical polymerization (ATRP) technique. The self-assembly behaviors of PMMA-b-C60 in ethyl acetate (EA) and decalin mixtures were studied using laser light scattering (LLS) and transmission electron microscopy (TEM). Homogeneous solutions of PMMA-b-C60 can be obtained in the solvent mixtures containing more than 40Â wt% EA, where the molar ratio of decalin to EA is close to 1. For each solvent mixture, unimers coexist with micelles and large aggregates. The sizes of PMMA-b-C60 micelles and aggregates are independent of polymer concentration, confirming that they are produced via the closed association mechanism. For the various solvent mixtures, the weight-averaged molecular weights, Mw of the PMMA-b-C60 aggregates range from 4.1Ã107 to 12.5Ã107Â g/mol. The hydrodynamic radii of the large aggregate, Rh, vary from 90 to 136Â nm, while the z-averaged radii of gyration, Rg, range from 210 to 311Â nm. The Rg/Rh value for each solvent mixture is â¼2.3, which is independent of decalin contents in the mixed solvents. The morphological study using the transmission electron microscope suggests that the large aggregates are composed of porous large compound micelles (LCM) in solution.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 13, 17 June 2005, Pages 4714-4721
Journal: Polymer - Volume 46, Issue 13, 17 June 2005, Pages 4714-4721
نویسندگان
Palaniswamy Ravi, Sheng Dai, Khan Meng Hong, Kam Chiu Tam, Leong Huat Gan,