Marco Sangermano

Politecnico di Torino, Torino, Piedmont, Italy

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Publications (181)301.88 Total impact

  • [Show abstract] [Hide abstract]
    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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    Dataset: SI1
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    Dataset: SI2
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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; · 2.34 Impact Factor
  • Macromolecular Chemistry and Physics 07/2014; · 2.39 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: 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). · 2.34 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
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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 02/2014; · 1.40 Impact Factor
  • Marco Sangermano, Kurt Dietliker
    Polymer. 01/2014;
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    ABSTRACT: In the present work, we prepared a new photoactive system, able to remove water pollutants by dispersion of TiO2 and the enzyme soybean peroxidase (SBP) within a polymer matrix. UV-cured acrylic polymeric films were prepared, in the presence of TiO2 and SBP. The choice of SBP was based on its ability to catalyze the oxidation of several substrates, coupled with a strong stability and thermal resistance. Since SBP requires H2O2 as cosubstrate, we verified the TiO2 ability to produce, under irradiation, enough H2O2 to activate SBP, both in aqueous suspension and when dispersed in the polymeric film. The experimental data support the possibility of using only the H2O2 produced by TiO2, thus allowing to devise a system able to be activated only by irradiation and self-renew, without the addition of reagents from the outside.The efficiency of the TiO2/SBP system, both dispersed in film and in aqueous suspension, were tested on 2,4,6-trichlorophenol. It was observed that TiO2 and SBP act synergistically, leading to an increase in the rate of removal of the model molecule. In addition, the system exhibits a certain selectivity on the intermediates products, above all hindering the formation of chloroderivatives, which is particularly interesting for future application in the field of environmental purification.
    Chemical Engineering Journal. 01/2014; 239:87–92.
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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 01/2014; · 2.34 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. 01/2014; 15(3):250–257.
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    D. Foix, M. Morell, A. Serra, M. Sangermano
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    ABSTRACT: New epoxy thermosets have been prepared via cationic UV-photopolymerization introducing two different multiarm star-like polymers. Both stars have a poly(glycidol) core but one has poly(methylmetacrylate) arms and the other poly(ε−caprolactone) ones. The characterization of the curing process has been performed by Real-Time FTIR and photo-DSC, observing a slight reduction in the curing rate on increasing the proportion of star. The thermosets prepared were characterized by gel content determination, DMTA and TGA, and finally the morphology observed by FE-SEM, demonstrating the formation of nanophases in the case of the star with poly(ε−caprolactone) arms. POLYM. ENG. SCI., 54:17–23, 2014. © 2013 Society of Plastics Engineers
    Polymer Engineering and Science 01/2014; 54(1). · 1.24 Impact Factor
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    ABSTRACT: We report here a simple, cheap and scale up process for obtaining a multifunctional coating with both, IR reflective and hydrophobic properties. These coatings can be applied on solar devices in order to limit their overheating under operating conditions. The system is based on UV-curable epoxy coating containing IR-reflective fillers and a silicone additive to modify the surface properties with a good hydrophobicity enhancement. The filler dispersion into the epoxy UV-curable resin did not significantly influence the photocuring rate, while a slight decrease of the final epoxy group conversion was evidenced. The optical properties of the obtained coatings have been evaluated by UV–vis–NIR spectroscopy showing that the films act as good “filters” in the NIR region, giving rise to a reduction of the absorbed heat and of the working temperature of the cells. A pronounced increase of hydrophobicity for the films containing the silicone additive was observed. The optical properties were not affected by the addition of the silicone additive.
    Progress in Organic Coatings 01/2014; 77(2):458–462. · 2.30 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. 01/2014;
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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 01/2014; 51(6). · 0.81 Impact Factor
  • 12/2013; 7(1).
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    ABSTRACT: A new approach is reported for the preparation of a graphene-epoxy flexible transparent capacitor obtained by graphene-polymer transfer and UV-induced bonding. SU8 resin is employed for realizing a well-adherent, transparent, and flexible supporting layer. The achieved transparent graphene/SU8 membrane presents two distinct surfaces: one homogeneous conductive surface containing a graphene layer and one dielectric surface typical of the epoxy polymer. Two graphene/SU8 layers are bonded together by using an epoxy photocurable formulation based on epoxy resin. The obtained material showed a stable and clear capacitive behavior.
    Macromolecular Rapid Communications 12/2013; · 4.93 Impact Factor

Publication Stats

533 Citations
301.88 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