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
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![عکس صفحه اول مقاله: Amphiphilic telechelics with polyhedral oligosilsesquioxane (POSS) end-groups: Dilute solution viscometry Amphiphilic telechelics with polyhedral oligosilsesquioxane (POSS) end-groups: Dilute solution viscometry](/preview/png/5188991.png)
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,