Marco Sangermano

Politecnico di Torino, Torino, Piedmont, Italy

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Publications (205)508.21 Total impact

  • S. Marchi, M. Sangermano, P. Meier, X. Kornmann
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    ABSTRACT: The synthesis of silicon compounds is usually performed by vulcanization at high temperatures in the presence of a platinum catalyst. The activation can also be achieved by UV light irradiation. When a suitable sensitizer is added to the formulation, the reaction can be triggered by lower wavelengths (in the visible spectra). In this way, both energy saving and greater safety are carried out. In the present paper, the reactivity of the trimethyl(methylcyclopentadienyl)-platinum(IV) catalyst (Me-Cp)Pt(Me)3 was investigated under visible light activation (380–515 nm) in the presence of different amount of 2-chlorothioxanthen-9-one (CTX) sensitizer. A proceeding of the curing after the irradiation was also observed leading to the formation of thick samples after short period of irradiation. The properties of the cured material were compared to those obtained by UV light activation.
    Journal of Photochemistry and Photobiology A Chemistry 05/2015; 303. DOI:10.1016/j.jphotochem.2015.02.013 · 2.29 Impact Factor
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    ABSTRACT: The synthesis of silicon compounds is mainly achieved by room temperature or high-temperature vulcanization reaction. Several transition-metal organometallic compounds such as platinum complexes can be used as catalysts to accelerate the thermal reaction. Moreover, these compounds are found to be also efficient for the cross-linking of silicone polymer by UV-activated reaction. In particular, cyclopentadienyl platinum complexes are considered as catalysts that can sustain an extremely high photochemical reaction after UV-light excitation. The reactivity of these catalysts (in particular the trimethyl(methylcyclopentadienyl) (IV) complex (Me-Cp)Pt(Me)3) for the photopolymerization of silicon polymer compounds is evaluated and compared with the most common bis(acetylacetonate)platinum (II) catalyst used for the UV-activated hydrosilation reaction.
    Macromolecular Reaction Engineering 04/2015; DOI:10.1002/mren.201500005 · 1.54 Impact Factor
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    ABSTRACT: Graphene–epoxy flexible capacitors are obtained by graphene–polymer transfer and bonding via UV-cured epoxy adhesive. Ceramic fillers are dispersed into the epoxy resin with the aim of enhancing the capacitive behavior of the final device. Parallel plate capacitors in which epoxy resin is filled with ceramic nanoparticles demonstrate superior performance, up to two orders of magnitude better than unfilled samples. Zirconia, showing the highest dielectric constant, fails to give a stable output in the whole frequency range, as some competing phenomena occur and reduce the overall polarization of the system. Boehmite appears to be a better choice and gives reasonable performances, better than gibbsite.
    Macromolecular Chemistry and Physics 01/2015; DOI:10.1002/macp.201400588 · 2.45 Impact Factor
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    ABSTRACT: Interpenetrated hybrid thiol-ene/epoxy network were obtained via UV-induced polymerization. By combining the network structure derived from epoxy curing with that of thiol-ene system we could expect an important toughening effect due to the presence of the polysulfide moieties. It is proposed the use of a penta-allylic triamine curing agent which can react with multifunctional thiols to produce polysulfides in situ, and at the same time has the ability to initiate the anionic polymerization of an epoxy resin. The higher the concentration of polysulfides in the resultant polymer, the better the toughness achieved.
    Progress in Organic Coatings 01/2015; 78:244-248. DOI:10.1016/j.porgcoat.2014.08.014 · 2.30 Impact Factor
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    ABSTRACT: Graphene sheets (GNPs) were functionalized with gold nanoparticles via a spontaneous deposition of gold particles on its surface occurred by chemical reduction of (Au3+). Even after only 1 min of reaction, the reduction of Au3+ into metallic Au0, takes place in evidencing the rapid and spontaneous character of the reduction. The particles, after only 3 min of deposition, have very small diameters, with average centred at 17 nm. The Au–GNP nanofillers were dispersed into UV-curable epoxy resin. Conductivity of the epoxy crosslinked samples containing Au–GNP nanofiller were compared to the values obtained for epoxy nanocomposite containing the same amount of bare graphene; the electrical conductivity was significantly increased by the addition of Au–GNP nanofiller, of about four orders of magnitude. This could be attributed to a charge transfer mechanism, which is strongly enhanced by the presence of gold NPs.
    Journal of Materials Science 01/2015; 50(2). DOI:10.1007/s10853-014-8619-z · 2.31 Impact Factor
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    ABSTRACT: This work reports the formulation of vinyl ether containing functionalized graphene sheets in order to produce UV-curable conductive inks. The best graphene-surfactant ratio was found to give a stable dispersion of graphene into triethyleneglycol divinyl ether (DVE3) resin, avoiding the presence of large filler aggregates that could clog printing head during ink-jet process. Propylene carbonate was used as solvent to adjust the viscosity of the formulation. The presence of graphene did not significantly hindered the UV-curing process. Crosslinked nanocomposite materials show a decrease of resistivity of seven order of magnitude with respect to the pristine polymeric matrix.
    Macromolecular Materials and Engineering 12/2014; 300(3). DOI:10.1002/mame.201400269 · 2.78 Impact Factor
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    ABSTRACT: An organic flexible capacitor was prepared via a multilayer UV-curing process of an acrylic based formulation. The outermost conductive layers were obtained by adding CNTs to PEG-DA resin up to a percolation threshold, found to correspond in between 1 to 2 phr CNTs.The presence of the filler did not significantly influence the photopolymerization rate, while a slight decrease on final acrylic double bond conversion was observed. An increase of Tg values was measured for the films containing CNTs and attributed to an hindering of the polymer chain mobility. A flexible layer was anyway obtained in the presence of 2 phr CNTs, with a Tg value around -25 °C. The three-layer capacitors were electrically characterized, studying impedance module and phase of the system as a function of frequency. Capacitances values are in the range of the shelf standard available discrete components.
    Polymer 11/2014; 56. DOI:10.1016/j.polymer.2014.11.021 · 3.77 Impact Factor
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    ABSTRACT: An acrylic latex filled with ZnO by miniemulsion polymerization are developed for stone protection. The main latex chemical properties are determined through dynamic light scattering and differential scanning calorimetry measurements. Contact angle determination, capillary water absorption, scanning electron microscopy observations, and colorimetric measurements are also used to evaluate the coating. The accelerated photo-aging of the dried films are monitored by infrared spectroscopy. The synthesis of a water dispersion product and the photostability reached through the introduction of ZnO represent the main advantages of this coating for the use in the field of stone conservation.
    Macromolecular Materials and Engineering 11/2014; 299(11). DOI:10.1002/mame.201400074 · 2.78 Impact Factor
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    ABSTRACT: Epoxy resins, widely used in conservation, still remain controversial materials. Considering some of the drawbacks that currently limit the application of epoxy consolidants, we present the application of the cationic ring opening polymerization as a novel method to cure the epoxy monomer in the restoration field. The cationic polymerization was carried out through a redox system based on the reduction of the iodonium salt in the presence of ascorbic acid catalyzed by a copper salt. The use of this initiator system for carrying out a suitable consolidant for lime plaster is considered. First, the film properties of the cured films were investigated. Then, the formulation was applied on a sample of plaster and its compatibility was verified. Its effectiveness as a consolidant product is explored through the evaluation of chromatic changes, mechanical strength, morphology of the re-aggregated material, and changes of the surface properties.
    Journal of Cultural Heritage 11/2014; DOI:10.1016/j.culher.2014.01.003 · 1.11 Impact Factor
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    ABSTRACT: Photocured polymeric films are a promising candidate for the realization of flexible electronics, due to their easy processability, low cost, and availability. In this work, electrically conductive UV-cured films have been prepared by irradiating an acrylic difunctional monomer in the presence of silver nitrate, pyrrole, and a photoinitiator. Homogeneously dispersed silver nanoparticles (size range 50–80 nm) embedded by polypyrrole formed throughout the acrylic matrix. Interestingly, the electrical conductivity of the acrylic films increased a hundred times after the formation of the Ag-polypyrrole nanoparticles.Evaluation of the irradiation process was conducted by UV–Vis spectroscopy using model systems where the acrylic monomer was substituted by a solvent. It has been shown that as a function of composition and irradiation time there is a simultaneous reduction of silver nitrate and pyrrole polymerization forming silver nanoparticles covered by the conductive polymer.
    Macromolecular Materials and Engineering 10/2014; 300(2). DOI:10.1002/mame.201400204 · 2.78 Impact Factor
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    ABSTRACT: Titania nanoparticles suspended in benzyl alcohol (BzOH) were generated by nonhydrolytic sol–gel process starting from titanium tetrachloride. The obtained suspensions were mixed with 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate epoxy resin, and the formulations were cured in the presence of ytterbium(III) trifluoromethanesulfonate as cationic initiator. The thermally activated cationic ring-opening polymerization produced a three-dimensional network in which the suspending medium BzOH was covalently linked to the epoxy network according to the “activated monomer” mechanism during the propagation step. The presence of titania nanoparticles resulted in a reinforcing and stiffening effect due to both their hydrodynamic effect and, most important, a significantly higher cross-linking density of the composite material with respect to the unfilled epoxy resin. A comparison with similar composites obtained by physical incorporation of preformed titania particles was also reported in order to compare the in situ and ex situ filler generation for preparing nanocomposites. POLYM. ENG. SCI., 2014. © 2014 Society of Plastics Engineers
    Polymer Engineering and Science 09/2014; DOI:10.1002/pen.24007 · 1.44 Impact Factor
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    ABSTRACT: Photoinitiated polymerization in aerosols is employed for the preparation of spherical polymer particles via cationic polymerization. The UV irradiation of aerosol monomer droplets starts the cationic curing process without the employment of any solvent or additives such as stabilizers, resulting in highly pure polymers. Crosslinked polymer spheres with a high gel content are obtained by processing vinyl ether and epoxy monomers via this aerosol-photopolymerization technique, which exhibits great potential for the development of multifunctional materials.
    Macromolecular Materials and Engineering 09/2014; 300(2). DOI:10.1002/mame.201400211 · 2.78 Impact Factor
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    ABSTRACT: Recently, graphene and its derivative nanosheets have been considered as potential candidates for gas barrier membranes. Here, the effect on the water-vapor barrier properties of incorporating graphene nanoplatelets into a UV-curable perfluoropolyether methacrylic oligo mer is investigated. By combining the hydrophobicity of the highly fluorinated polymer with the tortuous path induced by the graphene sheets, the barrier properties of the crosslinked films are further enhanced, acting both on the thermodynamic (low solubility) and kinetic (longer diffusion path) contribution of the water-vapor diffusion through the polymeric films. Good performance in increasing water-vapor barrier properties at a very low filler loading is obtained: the permeability is halved in the presence of only 0.3 wt% graphene.
    Macromolecular Chemistry and Physics 08/2014; 215(16). DOI:10.1002/macp.201400225 · 2.45 Impact Factor
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    Dataset: SI2
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    Dataset: SI1
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    ABSTRACT: Innovative epoxy-titania nanocomposites were prepared starting from titania nanoparticles suspended in benzyl alcohol (BzOH) generated by nonhydrolytic sol–gel process from TiCl4. The obtained suspensions were mixed with an epoxy resin (bisphenol A diglycidyl ether, DGEBA) and the formulations were cured in the presence of ytterbium(III) trifluoromethanesulfonate as cationic initiator. The thermally activated cationic ring-opening polymerization produced a three-dimensional network in which the suspending medium BzOH was covalently linked to the epoxy network according to the “activated monomer” mechanism during the propagation step. The presence of titania nanoparticles resulted in a reinforcing and stiffening effect due to both their hydrodynamic effect and, most important, a significantly higher cross-linking density of the composite material with respect to the unfilled epoxy resin. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40470.
    Journal of Applied Polymer Science 07/2014; 131(13). DOI:10.1002/app.40470 · 1.64 Impact Factor
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    ABSTRACT: Silicone polymers are widely used as polymer insulators for housing materials due to their superior properties in the presence of wet conditions and their high electrical properties such as low dielectric permittivity. The hydrosilation reaction (that is the addition of a Si-H bond across a double bond) is used in silicone industry to form crosslinked silicone polymers. In this work silica and aluminum hydroxide were used as reinforcing fillers in order to improve the properties of the material. Investigations about the nature and the amount of reinforcing particles evidence good thermal, mechanical and electrical properties of the composites with an increase of dry arc resistance values twice higher than the unfilled system. POLYM. COMPOS., 2013. © 2013 Society of Plastics Engineers
    Polymer Composites 07/2014; 35(7). DOI:10.1002/pc.22775 · 1.46 Impact Factor
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    ABSTRACT: This paper reviews the field of cationic UV-curing and reports recent progress made in understanding the fundamental chemistry and in technology applications. Radiation curing technologies are expanding rapidly on an industrial scale and interest in cationic photopolymerizations has advanced rapidly. In particular, the cationic UV-curing process presents additional benefits, including: the absence of air inhibition, a “dark-curing” reaction, low levels of toxicity and irritation, and a lower volume shrinkage during photopolymerization. In this review, a large number of papers and patents are reviewed and critically discussed specifically with respect to the application of cationic UV-curing technology in the field of coatings, composites, adhesives, and inks.
    Macromolecular Materials and Engineering 07/2014; 299(7). DOI:10.1002/mame.201300349 · 2.78 Impact Factor
  • Journal of Polymer Research 06/2014; 21(504). DOI:10.1007/s10965-014-0504-6 · 1.90 Impact Factor
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    ABSTRACT: A procedure is proposed to prepare electrically conductive epoxy resin composites exploiting in situ reduction of graphene oxide (GOx) during the epoxy thermal curing in presence of amine. The optimum curing conditions are evaluated, and the efficiency of the reduction process of GOx induced by amine is confirmed by XPS analyses. The composites electrical resistivity show a decrease by increasing filler amount, and this can only be due to the partial restoration of the conductive sp2 structure occurred during thermal curing. This is a simple, easy-to-scale, one-step process to obtain electrically conductive epoxy cured materials by mixing the resin components and the well dispersible insulating GOx.
    Macromolecular Materials and Engineering 06/2014; 299(6). DOI:10.1002/mame.201300286 · 2.78 Impact Factor

Publication Stats

2k Citations
508.21 Total Impact Points

Institutions

  • 2006–2015
    • Politecnico di Torino
      • DISAT - Department of Applied Science and Technology
      Torino, Piedmont, Italy
  • 2010
    • Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali
      Florens, Tuscany, Italy
  • 2001–2007
    • Rensselaer Polytechnic Institute
      Troy, New York, United States