کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5188991 | 1381174 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Amphiphilic telechelics with polyhedral oligosilsesquioxane (POSS) end-groups: Dilute solution viscometry
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Using capillary viscometry, we have investigated the associative behavior of new amphiphilic telechelics incorporating polyhedral oligosilsesquioxane (POSS) as an end-group of poly(ethylene glycol) (PEG) chains of varying length. Solution viscosities were strongly affected by the solvent composition in THF/water mixtures. When water, a selective solvent for PEO segments but a selective non-solvent for POSS segments, was added to the THF solutions, behavior common to polyelectrolytes was observed. In particular, for relatively high concentrations the reduced viscosity remained nearly concentration-invariant for both POSS telechelics and pure PEG homopolymers, indicating a limiting molecular weight of aggregates. On the other hand, a dramatic increase in the reduced viscosity was observed with decreasing concentration for lower concentration values, suggesting aggregate formation and a concentration-dependent aggregate size.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 17, 9 August 2006, Pages 6202-6207
Journal: Polymer - Volume 47, Issue 17, 9 August 2006, Pages 6202-6207
نویسندگان
Byoung-Suhk Kim, Patrick T. Mather,