کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1400629 984622 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Water transport in aluminium oxide-poly(ethylene-co-butyl acrylate) nanocomposites
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Water transport in aluminium oxide-poly(ethylene-co-butyl acrylate) nanocomposites
چکیده انگلیسی
Polymer composites with metal oxide nanoparticles are emerging materials for use as insulation in electrical applications. However, the extensive interfacial surfaces and the presence of polar groups on the particle surfaces make these composites susceptible to water sorption. Water sorption kinetics were studied at 23 °C and different relative humidities (18-90%) for composites based on poly(ethylene-co-butyl acrylate) and aluminium oxide (⩽12 wt.%); the latter being in three different forms: uncoated and coated with either octyltriethoxysilane or aminopropyltriethoxysilane. The equilibrium water uptake increased linearly with increasing overall concentration of polar groups on the nanoparticle surfaces. Composites with well-dispersed nanoparticles showed Fickian diffusion (constant diffusivity and invariant boundary conditions) with a diffusivity that decreased with increasing filler content; the maximum factorial decrease in diffusivity was 300 with reference to that of the pristine polymer. This effect was most pronounced for composites with accessible polar groups on the particle surfaces, suggesting that water saturation of the composites is retarded by dual water sorption. Composites that contained a sizeable fraction of large nanoparticle agglomerates showed a two-stage sorption process: a rapid process associated with the saturation of the matrix phase and a slow diffusion process due to water sorption by the large nanoparticle agglomerates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 47, Issue 12, December 2011, Pages 2208-2215
نویسندگان
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