کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5191634 1381236 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of the dispersion scale of reagents on the deformation of a reactive dispersed phase under shear flow
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Influence of the dispersion scale of reagents on the deformation of a reactive dispersed phase under shear flow
چکیده انگلیسی
Importance of the 'mixing scale' of reagents is shown through deformation experiments under shear flow on a reactive crosslinked dispersed phase. The EVA dispersed phase in a PDMS matrix can be crosslinked by ester-ester exchange reaction. Tetrapropoxyorthosilicate (TPOS) is used as the crosslinking agent and dibutyltin oxide (DBTO) is used as the precursor. Notion of 'droplet-reactors' is defined. Divergence of the reagents concentration in reactive EVA droplets from the bulk concentration is noticed. Diffusion of the liquid crosslinking agent (TPOS) from the reactive droplets into matrix is strongly inferred, as well as the heterogeneous dispersion of DBTO. First, influence of the mixing time on the dispersion of a powder catalyst (DBTO) in a highly viscous polymer is studied. Second, molecular mixing is experimented through distannoxanes formation when mixing DBTO and EVA. Microscale homogeneous reaction leads to an homogeneous deformation under shear flow of the crosslinked EVA droplets in PDMS matrix, meaning a homogeneous dispersion of the reagents in the EVA.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 13, 17 June 2005, Pages 4686-4694
نویسندگان
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