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- 저자 : Javad Seyfi (검색결과 2 건)
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Kiyoumars Labani Motlagh,Javad Seyfi,Hossein Ali Khonakdar,Saeed Mortazavi 한국고분자학회 2022 Macromolecular Research Vol.30 No.5
Vinyl ester (VE) based nanocomposite coatings, loaded with an optimum content of silica aerogels, were fabricated on aluminum. Different graphene contents (1, 2, and 3% w/w) were applied via one-step and two-step spraying methods. Surface properties exhibited pronounced changes for the two-step coatings but remained nearly unchanged for the one-step coatings. Graphene was localized in the bulk of one-step coatings whereas the two-step method led to the aggregation of graphene nanoplatelets on the coating surface. Depending on the graphene content, small stacks (2 μm) to large agglomerations (20 μm) were detected on the surface of two-step coatings. The water contact angle was essentially increased from 61° for the pure VE coating to 96° and 115° upon the incorporation of silica aerogel and induction of an individual graphene layer, respectively. Such enhanced hydrophobicity was the major reason for the improved corrosion protection properties as found by Tafel polarization plots. The maximum protection efficiency was obtained for the two-step coating loaded by 2% graphene (η=99.5%). In conclusion, vinyl ester resin was found to be a great candidate for applications where high-performance coatings with improved corrosion resistance are needed. Moreover, the use of graphene, as an individual layer on the coating surface, and the utilization of silica aerogel, as a corrosion protective additive, were demonstrated to be a promising approach in real-life corrosion protection applications.
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Ali Hadian Rasanani,Babak Kaffashi,Shervin Ahmadi,Javad Seyfi 한국고분자학회 2022 Macromolecular Research Vol.30 No.5
In this study, polylactic acid (PLA)/polyvinylidene fluoride (PVDF) blends were fabricated via solution casting. To eliminate the adverse effect of moistureinduced phase separation, the samples were dried at 60℃. The accelerated drying also reduced the phase separation between the blend components leading to a smaller size of the dispersed phase, i.e., increased interfacial area. Morphology results revealed that, in contrast to PVDF, PLA exhibits a more uniform distribution once used as the dispersed phase. The ratio of β to α crystals in PVDF was increased upon the introduction of PLA. On the other hand, the crystallized PVDF domains improved the PLA crystallinity. Rheological analysis indicated that the viscoelastic response of the 50/ 50 blend was governed by the PVDF phase, which agreed with the fact that PVDF became the matrix phase in that composition. The samples with PVDF as the matrix exhibited a shear-thinning behavior instead of the partial Newtonian behavior of blends with PLA as the matrix. The dynamic mechanical analysis results, further proved our claims from rheological measurements. The damping curves suggested that PVDF as the dispersed phase caused a higher restricting effect on the macromolecular motions, attributed to its dispersion quality. The wettability results showed an increasing trend in the hydrophobicity as the PVDF content increased in the blends. Due to the enhanced β phase content and improved compatibility, PLA/PVDF blends with 30/70 and 50/ 50 compositions show a promising potential to be used in piezoelectric devices.
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