کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5190529 1381208 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamic light scattering studies on random cross-linking of polystyrene in semi-dilute solution
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Dynamic light scattering studies on random cross-linking of polystyrene in semi-dilute solution
چکیده انگلیسی
The random cross-linking of appropriately functionalized polystyrene in semi-dilute toluene solution (c = 0.01-0.05 g/mL) was studied by time-dependent measurements of dynamic light scattering. Macroscopic gelation occurred from concentrations as low as 0.02 g/mL. The gelation time, determined from the first appearance of fluctuations of the scattering intensity and the initial amplitude of the intensity correlation function (ICF), decreases markedly from about 100 min to 10 min with an increase of polymer concentration or cross-linker content. After the gel point, the ICFs display a characteristic power-law decay. The power-law exponent, n = 0.75 ± 0.06, does not change with (i) extent of reaction, (ii) polymer concentration, and (iii) cross-linker concentration, within the inspected ranges. This universal behavior is traced back to the fact that gelation took place as a result of random cross-linking of existent macromolecules, whose state of solution does not change markedly during conversion.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 26, 8 December 2006, Pages 8488-8494
نویسندگان
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