کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5190972 1381223 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
In situ monitoring of mechanical properties during photopolymerization with particle tracking microrheology
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
In situ monitoring of mechanical properties during photopolymerization with particle tracking microrheology
چکیده انگلیسی
Microrheology was employed to perform in situ monitoring of the liquid-to-gel transition during free-radical photopolymerization. Photosensitive acrylate resins were exposed to ultraviolet light, while the Brownian motion of micrometer sized, inert fluorescent tracer particles was tracked via optical videomicroscopy. Statistical analysis of particle motion yielded the rheological properties of the embedding medium as a function of time and location, thereby relating UV exposure to the progress of polymerization and gelation. Microscopy enabled a detailed study of three-dimensional gelation profiles; other experimental parameters that were varied include photoinitiator concentration, monomer composition, the presence of oxygen and light intensity. Significant changes in gelation time were observed with increasing distance from the illuminated surface into the sample under all conditions. The results were used to test the accuracy of the standard energy threshold model, which is often used to empirically predict the outcome of photopolymerization reactions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 7, 22 March 2006, Pages 2263-2268
نویسندگان
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