کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5190646 1381213 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Studying the sol-gel transition of styrene-divinyl benzene crosslinking co-polymerization via excimer forming dye molecules
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Studying the sol-gel transition of styrene-divinyl benzene crosslinking co-polymerization via excimer forming dye molecules
چکیده انگلیسی
A novel method based on the steady state fluorescence technique was used to study the sol-gel transition in the free radical crosslinking reaction between styrene (St) and divinyl benzene (DVB) with 2,2′-azobisisobutyronitrile (AIBN) as initiator. N-(4-(pyrenyl methylene)-oxycarbonyl phenyl)maleimide (Py-MI) was used as a fluorescence probe. The possible enchainment of Py-MI in alternating sequences occurred randomly in polymer clusters produced modifications in the fluorescence spectra, namely the shift at the higher wavelengths due to the excimer formation. The fluorescence spectra of Py-MI's excimers allowed both to monitor the sol-gel transition and to test the critical exponents as function of co-monomer's concentration. The gel fraction exponent β and the weight average degree of polymerization exponent γ agreed best with the static percolation values. Although this technique was applied for St-DVB co-polymerization, it may be generalized for the other monomers that are able to bind chemically to Py-MI monomer during the polymerization.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 16, 26 July 2006, Pages 5843-5851
نویسندگان
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