Foto personale

Pagina personale di Massimo MESSORI

Dipartimento di Ingegneria "Enzo Ferrari"

P. FABBRI; M. MESSORI; F. PILATI; R. TAURINO; C. TONELLI; M. TOSELLI ( 2008 ) - Hydrophobic and Oleophobic Coatings Based on Perfluoropolyether/Silica Hybrids by the Sol-Gel Method - ADVANCES IN POLYMER TECHNOLOGY - n. volume 26 - pp. da 182 a 190 ISSN: 0730-6679 [Articolo in rivista (262) - Articolo su rivista]
Abstract

Glass substrates were spin-coated with a perfluoropolyether oligomer based organic-inorganic hybrid material, and prepared by the sol-gel process. Contact angle analysis and atomic force microscopic analysis were carried out to characterize the surface of the prepared coatings. All systems exhibited strong hydrophobic and oleopophobic characteristics. The wettability behavior was found to be almost independent of both molecular weight and functionality of the fluorinated oligomer. The low values obtained for the contact angle and surface tension indicate that surface segregation of perfluoropolyether segments is likely to take place within the network. On the basis of these results and the high quality of the obtained coatings, these materials could be used as functional coatings to impart water and oleo-repellent characteristics to glasses and other similar substrates.

M. Messori; M. Toselli; F. Pilati; P. Fabbri; L. Pasquali; M. Montecchi; S. Nannarone; C. Tonelli ( 2005 ) - Perfluoropolyether-based organic-inorganic hybrid coatings: Preparation and surface characterisation - SURFACE COATINGS INTERNATIONAL. PART B, COATINGS TRANSACTIONS - n. volume 88 - pp. da 243 a 249 ISSN: 1476-4865 [Articolo in rivista (262) - Articolo su rivista]
Abstract

Hydrophobic-oleophobic coatings were prepared by using the sol-gel process with organic-inorganic hybrids based on perfluoropolyether-polycaprolactone (PFPE-PCL) copolymers. Hybrid coatings were prepared by changing the organic-inorganic ratio, the PFPE/PCL ratio in the copolymer, and the reaction conditions. A complete surface characterisation was carried out by contact angle analysis and x-ray photoemission spectroscopy (XPS). In all cases the wettability of the coatings was found to be very low. Surface composition analysis showed that the surface segregation of the fluorinated PFPE segments was always high enough to give a very high hydrophobic character to the coating surface.

E. FABBRI; P. FABBRI; M. MESSORI; F. PILATI; C. TONELLI; M. TOSELLI ( 2004 ) - Surface modification of unsaturated polyester resins with perfluoropolyethers - POLIMERY - n. volume 49 - pp. da 785 a 789 ISSN: 0032-2725 [Articolo in rivista (262) - Articolo su rivista]
Abstract

Fluorine-modified unsaturated polyester resins (FUPR) were prepared by using polycaprolactone-perfluoropolyether-polycaprolactone triblock copolymers having hydroxyl or methacrylate end-groups. Despite the immiscibility of the perfluoropolyether segment, all the modified resins were fully transparent after curing thanks to the compatibilization effect of the polycaprolactone segments. Contact angle measurements showed a very low water wettability for all investigated resin compositions. Also in the case of system with the lower bulk copolymer concentration (less than 0.3 phr) contact angles were higher than 94°. It has been demonstrated that the presence of methacrylate end-groups tends to hinder the surface segregation of the fluorinated additive.

M. MESSORI; A. TOSELLI; F. PILATI; E. FABBRI; P. FABBRI; L. PASQUALI; S. NANNARONE ( 2004 ) - Prevention of plasticizer leaching from PVC medical devices by using organic-inorganic hybrid coatings - POLYMER - n. volume 45 - pp. da 805 a 813 ISSN: 0032-3861 [Articolo in rivista (262) - Articolo su rivista]
Abstract

α,ω-triethoxysilane terminated poly(ethylene oxide) (PEO-Si) was prepared and used to produce organic/inorganic hybrids by the sol–gel approach. These hybrids were used as coatings for flexible PVC tubes in order to reduce the plasticizer leaching from PVC medical devices. Extraction tests carried out with hexane indicated that all coating composition investigated are able to strongly reduce (about one order of magnitude) the leaching of di-ethylhexyl phthalate in hexane. The best results were obtained by an accurate balance of organic and inorganic phases content. XPS analysis showed a preferential segregation of silica onto the outer surface suggesting that a high inorganic content at the coating–extraction medium interface was present.

M. MESSORI; M. TOSELLI; F. PILATI; E. FABBRI; P. FABBRI; S. BUSOLI; L. PASQUALI; S. NANNARONE ( 2003 ) - Flame Retarding Poly(Methyl Methacrylate) with Nanostructured Organic-Inorganic Hybrids Coatings (Elsevier Science Limited:Oxford Fulfillment Center, PO Box 800, Kidlington Oxford OX5 1DX United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: asianfo@elsevier.com, tcb@elsevier.co.UK, INTERNET: http://www.elsevier.com, http://www.elsevier.com/locate/shpsa/, Fax: 011 44 1865 843010 ) - POLYMER - n. volume 44 - pp. da 4463 a 4470 ISSN: 0032-3861 [Articolo in rivista (262) - Articolo su rivista]
Abstract

Organic–inorganic hybrid materials were prepared starting from tetraethoxysilane and α- or α,ω-triethoxysilane terminated poly(ε-caprolactone) (PCL–Si) using the sol–gel process. In all cases the formation of nanocomposites with a high level of interpenetration between organic and inorganic phases was noted. Poly(methyl methacrylate) slabs were dip-coated with PCL–Si/silica hybrids and a very strong increase of the flame resistance (also after UV irradiation) was noted for all coating compositions without marked differences with respect to hybrid compositions. This behavior was attributed to a preferential segregation of silica onto the outer surface, as evidenced by XPS analysis.