توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Automotive industry: Using conducting composites as primer coating under the cataphoretic painting
نویسنده(ها):
اطلاعات انتشار: چهارمین کنگره بین المللی پوشش های حمل و نقل، سال
تعداد صفحات: ۶
Conductive polymer coatings are mostly considered as one of the most effective anti–corrosion materials, while at the same time are the most environmentally friendly materials.The negatively charged water–soluble long, need likemultiwal carbon nanotubes (better known as MWCNT–7) serves as anionic dopant during the electropolymerization to synthesize PPy\MWCNT composite films. The synthetic, morphological and electrical properties of PPy\MWCNT–7 films and polypyrrole (PPy) films were compared. Characterization was performed by cyclic voltammetry and scanning electron microscopy (SEM). SEM images revealed that the incorporation of MWCNT–7 significantly altered the morphology of the PPy. To predict mechanical properties of carbon nanotube composites bonded with multiple multiwall carbon nanotubes, we have used computational method based on molecular dynamics (MD) and molecular mechanics (MM). Therefore, to evaluate the anti–corrosive features of the matrix Polypyrrole (PPy) film, experiments were performed to analyse the performance of PPY and multiwallcarbon nano–tubes (MWCNT–7) or Long, tangled (MWCNTLT) reinforced composite coatings. Computational tools were implemented to investigate mechanical properties of PPy\MWCNT–7 and PPy\MWCNTLTcomposites. Then, using potentiodynamic measurements, transmission electron microscopy (TEM) and scanning electron microscopy (SEM), the obtained films were experimentally assessed as anti–corrosive materials. The SEM\TEM results showed that the MWCNTLTand MWCNT–7 were fully dispersed in the composite coatings, further tests indicated they also have significantly improved mechanical integrity of composites. Furthermore, it was safe to conclude that using composite coating is more capable at anti–corrosion protecting than using pure PPy. Increasing MWCNT content were in parallel of increasing Young’s moduli, and values changed from 2.67 GPa (pure PPy) to 4.15–4.61 GPa (PPy\MWCNT–7 composite system).<\div>

۲Quantitative determination of interfacial adhesion I n composites with strong bonding
نویسنده(ها):
اطلاعات انتشار: چهارمین کنگره بین المللی پوشش های حمل و نقل، سال
تعداد صفحات: ۷
Abstract. An approach was proposed for the quantitative determination of adhesion strength in composites, in which adhesion is created by other mechanisms than secondary interactions. The approach is based upon a model, which gives debonding stress as a function of interfacial adhesion. Debonding stress was determined by acoustic emission experiments. The mechanism of deformation was checked by SEM experiments and the approach was verified on composites with known interfacial adhesion. The results showed that the use of functionalized polymer in Polyethylene Oxide (PEO)\Silicon alkoxides(shown asSi(OR)4) composites resulted in adhesion strength one order of magnitude larger than without the coupling agent. The application of various surface modification techniques in PEO\glass bead composites yielded different adhesion values covering a range of about one order of magnitude. The quantitative determination of interfacial adhesion makes possible the design and optimization of most surface modification techniques in particulate filled and short fiber reinforced composites.<\div>
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