Marco Sangermano

Politecnico di Torino, Torino, Piedmont, Italy

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Publications (190)468.65 Total impact

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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). · 2.31 Impact Factor
  • Progress in Organic Coatings 01/2015; 78:244-248. · 2.30 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; · 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; · 3.77 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; · 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; · 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; · 1.24 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; · 2.78 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 07/2014; · 2.78 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; · 2.78 Impact Factor
  • Macromolecular Chemistry and Physics 07/2014; · 2.45 Impact Factor
  • Sandra Medel, Paula Bosch, Marco Sangermano
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    ABSTRACT: In this work, functionalization of epoxy films with dansyl and naphthalimide fluorophores is described. The procedure involves UV-photopolymerization of an epoxy formulation that includes bromomethyl reactive groups, and their post-functionalization modification through a click strategy. Quantitative click reaction within the bulk of the film allows one to obtain films in which the fluorophore is uniformly and covalently linked throughout the epoxy network. Depending on the chromophore bounded, the films are sensitive to different stimuli. Evaluation of the fluorescence emission of the films shows a linear response towards changes in polarity but less sensitivity than that of the low-molecular-weight chromophore. © 2013 Society of Chemical Industry
    Polymer International 06/2014; 63(6). · 2.13 Impact Factor
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    ABSTRACT: The surface modification of graphene is of fundamental importance when working on the fabrication of high performing polymeric nanocomposite exploiting the exciting properties of this carbon-based material. Using low cost graphene oxide as starting material, trading on its richness of –OH groups and its ability to be reduced under UV light, a facile two-step UV-based process for the reduction to graphene and the simultaneous covalent grafting of initiating moieties at its surface is here proposed. This procedure enables the subsequent photo-grafting of a great variety of monomers for graphene surface functionalization. Chemical, structural and electrical analysis of the functionalized graphene sheets demonstrated the reduction of the starting oxide and the grafting of the initiator and of the acrylic monomers used in this study. This procedure opens the route for a low cost production of grafted graphene that can be easily dispersed in organic matrices, in order to produce highly performing functional materials.
    Carbon 05/2014; 77:226-235. · 6.16 Impact Factor
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    ABSTRACT: An investigation into the in situ preparation of polymer/silver nanoprism composites is described. Photoinitiated polymerizations of N-vinyl pyrrolidone (NVP) in water using 2-hydroxy-2-methyl-1-phenyl propanone as photoinitiator under nitrogen and simultaneous redox reactions of AgNO3 resulted in the formation of poly(N-vinyl pyrrolidone) (PNVP)/silver nanocomposites. Prolonged irradiations at low photoinitiator concentration and equimolar concentrations of AgNO3 and NVP produced only spherical silver nanoparticles. The nanocomposites produced at high silver and photoiniatiator concentrations with short irradiation times e.g. 5 min contain polygonal (mainly triangular) silver nanoprisms as evidenced by spectral and TEM analysis.
    Journal of Macromolecular Science Part A 05/2014; 51(6). · 0.74 Impact Factor
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    ABSTRACT: An epoxy coating modified by PDMS hydroxyl terminated is presented in this paper in order to evaluate its potential use as a protective of a stone surface. With a view to its use in restoration sites, visible and long-wavelength photoinitiated cationic polymerization is proposed here. The system investigated is based on a crosslinking mechanism which shows remarkable advantages for stone protection, such as the low toxicity of the products and facility of mixture preparation. Furthermore, the visible light exploitation represents the most important advantage, because it is easy to apply in a restoration site, with or without irradiation instruments. Besides coating characterization through FT-IR, DMTA analyses and contact angle measurement on glass slides, analyses were also carried out on coated plaster samples. These analyses were performed in order to evaluate the effectiveness of the protective, in relationship to hydrophobicity (contact angle measurement, capillary water absorption) and morphology surface changing (SE/SEM observations, colorimetric measurements) before and after polymer application and UV aging test of coated samples. The overall characterization makes it possible to consider it a suitable coating for stone protection.
    Journal of Cultural Heritage 05/2014; 15(3):250–257. · 1.11 Impact Factor
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    ABSTRACT: Hybrid thiol-ene system based on a hyperbranched polyester with different degrees of 10-undecenoyl modification are prepared via a dual UV-thermal process. The pristine thiol-ene formulation shows a high reactivity towards UV curing and the addition of the inorganic precursor to the photocurable formulation does not affect the UV-curing process. The crosslinked systems show an increase of Tg by increasing the vinyl functionality content in the HBP and a Tg increase is also evidenced in the hybrid system as a function of inorganic precursor content. Morphological investigations show that the inorganic domains generated in situ are homogeneously distributed throughout the polymeric matrix. By varying the 10-undecenoyl modification in the terminal groups of the HBP, the size of the inorganic domains is tunable and it is possible to decrease the dimension of the silica domains by using the HBP with a higher modification degree.
    Macromolecular Materials and Engineering 04/2014; 299(4). · 2.78 Impact Factor
  • Marco Sangermano, Kurt Dietliker
    Polymer 04/2014; · 3.77 Impact Factor
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    ABSTRACT: Multiam star polyesters were synthesized by growing poly(ε-caprolactone) (PCL) arms from hyperbranched polyesters cores of different molecular weight and used as polymeric modifiers in UV-curable cationic formulations based on a biscycloaliphatic epoxy resin. The effect of the multiarm stars on the curing kinetics has been investigated by real-time FTIR. The thermal-mechanical properties of the photocured thermosets have been studied with calorimetry and dynamomechanical and thermogravimetric analysis. Impact strength tests have been performed to assess their effect on the toughness of the cured materials. An accelerative effect of these modifiers has been observed as a consequence of the participation of the hydroxyl groups of the modifiers in the cationic curing of the epoxy resin. A modest increase in toughness accompanied by a decrease in the glass transition are observed, as a consequence of the incorporation of the modifiers into the network structure, leading to homogeneous, in situ reinforced materials. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2014, 131, 40005.
    Journal of Applied Polymer Science 03/2014; 131(6). · 1.40 Impact Factor

Publication Stats

1k Citations
468.65 Total Impact Points

Institutions

  • 2006–2014
    • Politecnico di Torino
      Torino, Piedmont, Italy
  • 2008
    • Leibniz Institute of Polymer Research Dresden
      • Max Bergmann Center for Biomaterials
      Dresden, Saxony, Germany
    • University of Bologna
      • "Guglielmo Marconi" Department of Electrical, Electronic and Information Engineering DEI
      Bolonia, Emilia-Romagna, Italy
    • Istanbul Technical University
      • Department of Chemistry
      İstanbul, Istanbul, Turkey
  • 2005
    • Université Paris-Sud 11
      Orsay, Île-de-France, France