Publications

Publications


  • Thermo-Mechanical Behavior and Hydrolytic Degradation of Linear Low Density Polyethylene/Poly(3-hydroxybutyrate) Blends 2020

    Rigotti, D.; Dorigato, A.; Pegoretti, A., "Thermo-Mechanical Behavior and Hydrolytic Degradation of Linear Low Density Polyethylene/Poly(3-hydroxybutyrate) Blends" in FRONTIERS IN MATERIALS, v. 7, (2020). - DOI: 10.3389/fmats.2020.00031

    2020 journal paper

  • Novel poly(caprolactone)/epoxy blends by additive manufacturing 2020

    Dorigato, A.; Rigotti, D.; Pegoretti, A., "Novel poly(caprolactone)/epoxy blends by additive manufacturing" in MATERIALS, v. 13, n. 4 (2020), p. 819. - DOI: 10.3390/ma13040819

    2020 journal paper

  • Detailed experimental and theoretical investigation of the thermomechanical properties of epoxy composites containing paraffin microcapsules for thermal management 2020

    Fredi, G.; Dorigato, A.; Fambri, L.; Pegoretti, A., "Detailed experimental and theoretical investigation of the thermomechanical properties of epoxy composites containing paraffin microcapsules for thermal management" in POLYMER ENGINEERING AND SCIENCE, v. 60, n. 6 (2020), p. 1202-1220. - DOI: 10.1002/pen.25374

    2020 journal paper

  • Thermal mending in novel epoxy/cyclic olefin copolymer blends 2020

    Mahmood, H.; Dorigato, A.; Pegoretti, A., "Thermal mending in novel epoxy/cyclic olefin copolymer blends" in EXPRESS POLYMER LETTERS, v. 14, n. 4 (2020), p. 368-383. - DOI: 10.3144/expresspolymlett.2020.31

    2020 journal paper

  • Evaluation of the Role of Devulcanized Rubber on the Thermo-mechanical Properties of Polystyrene 2020

    Valentini, F.; Dorigato, A.; Pegoretti, A., "Evaluation of the Role of Devulcanized Rubber on the Thermo-mechanical Properties of Polystyrene" in JOURNAL OF POLYMERS AND THE ENVIRONMENT, v. 28, n. 6 (2020), p. 1737-1748. - DOI: 10.1007/s10924-020-01717-8

    2020 journal paper

  • Healable carbon fiber-reinforced epoxy/cyclic olefin copolymer composites 2020

    Mahmood, H.; Dorigato, A.; Pegoretti, A., "Healable carbon fiber-reinforced epoxy/cyclic olefin copolymer composites" in MATERIALS, v. 13, n. 9 (2020), p. 2165. - DOI: 10.3390/ma13092165

    2020 journal paper

  • Lifetime assessment of high-density polyethylene–silica nanocomposites 2019

    Dorigato, A.; Govaert, L. E.; Pegoretti, A., "Lifetime assessment of high-density polyethylene–silica nanocomposites" in NANOMATERIALS AND NANOTECHNOLOGY, v. 9, (2019), p. 1-11. - URL: http://nax.sagepub.com/content/by/year . - DOI: 10.1177/1847980419849984

    2019 journal paper

  • Polyethylene-based single polymer laminates: Synergistic effects of nanosilica and metal hydroxides 2019

    Dorigato, Andrea; Fredi, Giulia; Fambri, Luca; Lopez Cuesta, Jose Marie; Pegoretti, Alessandro, "Polyethylene-based single polymer laminates: Synergistic effects of nanosilica and metal hydroxides" in JOURNAL OF REINFORCED PLASTICS AND COMPOSITES, v. 38, n. 2 (2019), p. 62-73. - URL: http://jrp.sagepub.com/content/by/year . - DOI: 10.1177/0731684418802974

    This work aims to investigate the fire performance of novel polyethylene-based single polymer composites. Fumed silicananoparticles and magnesium hydroxide microfiller were added at an optimized concentration to a linear low-densitypolyethylene matrix, which was then reinforced with ultra-high molecular weight polyethylene fibers. Through theoptimization of the production process, it was possible to limit the porosity inside the single polymer composites,thus retaining the pristine mechanical properties of the fibers. The addition of SiO2 and magnesium hydroxide determinedan increase in the elastic modulus in both the longitudinal and transversal direction, but it concurrently led to areduction in ductility, especially in the transversal direction. The fillers were proved to bring interesting improvements ofthe thermal degradation resistance and of the flame behaviour. Thermogravimetric analysis tests highlighted an increasein the onset degradation temperature and in the temperature associated to the maximum degradation rate. Moreover,both the oxidation onset temperature and limiting oxygen index were considerably improved. Cone calorimetry testsevidenced that filled single polymer composites were characterized by lower peak heat release rate and total heatreleased with respect to neat single polymer composites.

    2019 journal paper

  • Thermo-mechanical and adhesive properties of polymeric films based on ZnAl-hydrotalcite composites for active wound dressings 2019

    Perioli, Luana; Dorigato, Andrea; Pagano, Cinzia; Leoni, Matteo; Pegoretti, Alessandro, "Thermo-mechanical and adhesive properties of polymeric films based on ZnAl-hydrotalcite composites for active wound dressings" in POLYMER ENGINEERING AND SCIENCE, v. 59, n. S1 (2019), p. E112-E119. - URL: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1548-2634 . - DOI: 10.1002/pen.24877

    Composite films based on sodium carboxymethyl cellulose(Na-CMC) loaded with a ZnAl(OH)2CO3yH2O hydrotalcite(ZnAl-HTlc), were developed and characterized. Thecomposites were mechanically more stable than thematrix alone: the noticeable enhancement of elastic modulus,creep resistance and failure properties, all proportionalto the filler content, came at the expenses of acertain embrittlement. The filler tended to aggregate inthe composites and the size of the aggregates increasedwith ZnAl-HTlc amount. Contact angle measurementshighlighted how ZnAl-HTlc introduction in the polymericmatrix could strongly modify the wettability conditions ofthe films increasing their hydrophilicity. Bioadhesion testsshowed that the adhesion behavior of the compositesdecreased as ZnAl-HTlc amount increases, testifying theinfluence of the filler on the ability of the film to bind skinsurface. Therefore, the developed films may find applicationas active wound dressings since ZnAl-HTlc can beeasily intercalated with an active pharmaceutical ingredientto be progressively released on the wound.

    2019 journal paper

  • Novel electroactive polyamide 12 based nanocomposites filled with reduced graphene oxide 2019

    Dorigato, A.; Pegoretti, A., "Novel electroactive polyamide 12 based nanocomposites filled with reduced graphene oxide" in POLYMER ENGINEERING AND SCIENCE, v. 59, n. 1 (2019), p. 198-205. - URL: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1548-2634 . - DOI: 10.1002/pen.24889

    Novel electroactive nanocomposites were prepared by addingto a polyamide 12 (PA12) matrix different amounts (from1 to 8 wt%) of reduced graphene oxide (rGO), and thethermo-electrical behavior of the prepared bulk materialswas compared with that of the corresponding fibers. FESEMmicrographs on bulk materials highlighted an evident aggregationof the rGO lamellae, proportional to the filler concentration.The presence of rGO stacks was responsible of aheavy embrittlement of the samples, with a strong reductionof the elongation at break, and of the limited electrical conductivityof the samples (about 105 Xcm with a rGO amountof 4 wt%). Moreover, nanofiller addition determined animprovement of the thermal degradation resistance, associatedto a slight drop of the glass transition temperature(about 78C with a nanofiller concentration of 4 wt%) and ofthe crystallinity degree (up to 9% for an rGO loading of 4wt%). The extrusion process adopted to prepare nanocompositefibers caused a partial breakage of rGO aggregatesand their progressive alignment along the drawing direction,determining thus an electrical resistivity increase withrespect to the bulk samples. Therefore, the surface heatingof the prepared fibers through Joule effect was possible onlyat elevated rGO amounts (i.e., 8 wt%).

    2019 journal paper

  • Application of the thermal energy storage concept to novel epoxy–short carbon fiber composites 2019

    Dorigato, A.; Fredi, G.; Pegoretti, A., "Application of the thermal energy storage concept to novel epoxy–short carbon fiber composites" in JOURNAL OF APPLIED POLYMER SCIENCE, v. 136, n. 21 (2019), p. 47434. - URL: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-4628 . - DOI: 10.1002/app.47434

    For the first time, multifunctional epoxy-short carbon fiber reinforced composites suitable for thermal energy storage technology were developed. Paraffin microcapsules (MC) and short carbon fibers (CFs) were added at different relative amounts to an epoxy matrix, and the microstructural and thermomechanical properties of the resulting materials were investigated. Scanning electron microscopy images of the composites showed a uniform distribution of the capsules within the matrix, with a rather good interfacial adhesion, while the increase in the polymer viscosity at elevated CF and MC amounts caused an increase in the void content. Differential scanning calorimetry tests revealed that melting enthalpy values (up to 60 J/g) can be obtained at high MC concentrations. The mixing and thermal curing of the composites did not lead to breakage of the capsules and to the consequent leakage of the paraffin out of the epoxy matrix. The thermal stability of the prepared composites is not negatively affected by the MC addition, and the temperatures at which the thermal degradation process begins were far above the curing or service temperature of the composites. Flexural and impact tests highlighted that the presence of MC reduces the mechanical properties of the samples, while CF positively contributes to retaining the original stiffness and mechanical resistance.

    2019 journal paper

  • Structure and properties of polyamide 11 nanocomposites filled with fibrous palygorskite clay 2019

    Benobeidallah, B.; Benhamida, A.; Dorigato, A.; Sola, A.; Messori, M.; Pegoretti, A., "Structure and properties of polyamide 11 nanocomposites filled with fibrous palygorskite clay" in JOURNAL OF RENEWABLE MATERIALS, v. 7, n. 1 (2019), p. 89-102. - URL: http://www.techscience.com/JRM/index.html . - DOI: 10.32604/jrm.2019.00136

    2019 journal paper

  • Thermo-electrical behaviour of cyclic olefin copolymer/exfoliated graphite nanoplatelets nanocomposites foamed through supercritical carbon dioxide 2019

    Dorigato, A.; Biani, A.; Bonani, W.; Pegoretti, A., "Thermo-electrical behaviour of cyclic olefin copolymer/exfoliated graphite nanoplatelets nanocomposites foamed through supercritical carbon dioxide" in JOURNAL OF CELLULAR PLASTICS, v. 55, n. 3 (2019), p. 263-282. - DOI: 10.1177/0021955X19839733

    2019 journal paper

  • Thermo-mechanical behavior of novel wood laminae-thermoplastic starch biodegradable composites with thermal energy storage/release capability 2019

    Dorigato, A.; Fredi, G.; Pegoretti, A., "Thermo-mechanical behavior of novel wood laminae-thermoplastic starch biodegradable composites with thermal energy storage/release capability" in FRONTIERS IN MATERIALS, v. 6, (2019). - URL: https://www.frontiersin.org/articles/10.3389/fmats.2019.00076/pdf . - DOI: 10.3389/fmats.2019.00076

    2019 journal paper

  • Evaluation of the role of carbon nanotubes on the electrical properties of poly(butylene terephthalate) nanocomposites for industrial applications 2019

    Dorigato, A.; Freitas, V.; Covas, J. A.; Paiva, M. C.; Brugnara, M.; Pegoretti, A., "Evaluation of the role of carbon nanotubes on the electrical properties of poly(butylene terephthalate) nanocomposites for industrial applications" in THE JOURNAL OF ELASTOMERS AND PLASTICS, v. 51, n. 1 (2019), p. 3-25. - DOI: 10.1177/0095244318768634

    In this article, innovative electrically conductive polymer nanocomposites based on poly(butylene terephthalate) (PBT) filled with carbon nanotubes (CNTs) at different concentrations, to be used in the automotive field, have been investigated. Field emission scanning electron microscopy (FESEM) analysis revealed how a good nanofiller dispersion was obtained, especially by using surface treated nanotubes and by processing these materials using a more restrictive screw configuration. Melt flow index measurements highlighted that the processability of these nanocomposites was reduced at elevated filler amounts, even if CNT surface treatment promoted a partial retention of the fluidity of the neat PBT. Thermal degradation stability was improved upon the addition of CNT, even at limited filler amounts. Differential scanning calorimetry measurements evidenced how the presence of CNT slightly increased both the crystallization temperature and the crystalline fraction of the materials. The additivation of CNTs promoted a stiffening effect at elevated CNT contents, associated to an evident embrittlement of the samples. Electrical resistivity measurements showed that the most interesting results (i.e. 2.6 × 101 Ω·cm) were obtained for nanocomposites with a total filler content of 3 wt%, processed using the more restrictive screw configuration. For these materials, it was possible to obtain a rapid surface heating through Joule effect at applied voltages of 12 V.

    2019 journal paper

  • Temperature dependent strain/damage monitoring of glass/epoxy composites with graphene as a piezoresistive interphase 2019

    Mahmood, H.; Dorigato, A.; Pegoretti, A., "Temperature dependent strain/damage monitoring of glass/epoxy composites with graphene as a piezoresistive interphase" in FIBERS, v. 7, n. 2 (2019). - URL: https://res.mdpi.com/fibers/fibers-07-00017/article_deploy/fibers-07-00017.pdf?filename=&attachment=1 . - DOI: 10.3390/FIB7020017

    2019 journal paper

  • Polyhydroxyalkanoates/Fibrillated Nanocellulose Composites for Additive Manufacturing 2019

    Valentini, Francesco; Dorigato, A.; Rigotti, D.; Pegoretti, A., "Polyhydroxyalkanoates/Fibrillated Nanocellulose Composites for Additive Manufacturing" in JOURNAL OF POLYMERS AND THE ENVIRONMENT, v. 27, n. 6 (2019), p. 1333-1341. - URL: http://www.kluweronline.com/issn/1566-2543/ . - DOI: 10.1007/s10924-019-01429-8

    2019 journal paper

  • Polymer Composites: Reinforcing Fillers 2019

    Pegoretti, Alessandro; Dorigato, Andrea, "Polymer Composites: Reinforcing Fillers" in Encyclopedia of Polymer Science and Technology, Hoboken, NJ (USA): John Wiley & Sons, 2019, p. 1-72. - ISBN: 9781118633892. - URL: https://onlinelibrary.wiley.com/doi/book/10.1002/0471440264 . - DOI: 10.1002/0471440264.pst130.pub2

    2019 chapter

  • Discontinuous carbon fiber/polyamide composites with microencapsulated paraffin for thermal energy storage 2019

    Fredi, Giulia; Dorigato, Andrea; Unterberger, Seraphin; Artuso, Nicolò; Pegoretti, Alessandro, "Discontinuous carbon fiber/polyamide composites with microencapsulated paraffin for thermal energy storage" in JOURNAL OF APPLIED POLYMER SCIENCE, v. 136, n. 16 (2019), p. 47408. - URL: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-4628 . - DOI: 10.1002/app.47408

    This work focuses on the development of multifunctional thermoplastic composites with thermal energy storage capability. A polyamide 12 (PA12) matrix was filled with a phase change material (PCM), constituted by paraffin microcapsules (Tmelt = 43 °C), and reinforced with carbon fibers (CFs) of two different lengths (chopped/CF “long”[CFL] and milled/CF “short” [CFS]). DSC tests showed that the melting/crystallization enthalpy values increase with the PCM weight fraction up to 60 J/g. The enthalpy was 41–94% of the expected value and decreased with an increase in the fiber content, because the capsules were damaged by the increasing viscosity and shear stresses during compounding. Long CFs increased the elastic modulus (+316%), tensile strength (+26%), and thermal conductivity (+54%) with respect to neat PA12. Thermal imaging tests evidenced a slower cooling for the samples containing PCM, and once again the CFS-containing samples outperformed those with CFL, due to the higher effective PCM content.

    2019 journal paper

  • Effect of expandable and expanded graphites on the thermo-mechanical properties of polyamide 11 2019

    Oulmou, F.; Benhamida, A.; Dorigato, A.; Sola, A.; Messori, M.; Pegoretti, A., "Effect of expandable and expanded graphites on the thermo-mechanical properties of polyamide 11" in THE JOURNAL OF ELASTOMERS AND PLASTICS, v. 51, n. 2 (2019), p. 175-190. - DOI: 10.1177/0095244318781956

    The preparation and thermo-mechanical characterization of composites based onpolyamide 11 (PA11) filled with various amounts of both expandable and expandedgraphites are presented. Investigation conducted using X-ray diffraction (XRD), scanningelectron microscopy and surface area analyses indicated how graphite expanded underthe selected processing conditions. The XRD analysis on PA11/graphite compositesrevealed no change in the crystal form of the PA11, while the presence of diffractionpeaks associated to the graphite-stacked lamellae can be still detected. All the investigatedcomposites showed an improvement of the thermal stability and mechanicalproperties (elastic and storage moduli).

    2019 journal paper

  • Shape memory epoxy nanocomposites with carbonaceous fillers and in-situ generated silver nanoparticles 2019

    Dorigato, Andrea; Pegoretti, Alessandro, "Shape memory epoxy nanocomposites with carbonaceous fillers and in-situ generated silver nanoparticles" in POLYMER ENGINEERING AND SCIENCE, v. 59, n. 4 (2019), p. 694-703. - URL: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1548-2634 . - DOI: 10.1002/pen.24985

    2019 journal paper

  • Novel reactive thermoplastic resin as a matrix for laminates containing phase change microcapsules 2019

    Fredi, G.; Dorigato, A.; Pegoretti, A., "Novel reactive thermoplastic resin as a matrix for laminates containing phase change microcapsules" in POLYMER COMPOSITES, v. 40, n. 9 (2019), p. 3711-3724. - URL: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1548-0569 . - DOI: 10.1002/pc.25233

    2019 journal paper

  • Multifunctional epoxy/carbon fiber laminates for thermal energy storage and release 2018

    Fredi, Giulia; Dorigato, Andrea; Fambri, Luca; Pegoretti, Alessandro, "Multifunctional epoxy/carbon fiber laminates for thermal energy storage and release" in COMPOSITES SCIENCE AND TECHNOLOGY, v. 158, (2018), p. 101-111. - URL: https://www.sciencedirect.com/science/article/pii/S0266353817325939 . - DOI: 10.1016/j.compscitech.2018.02.005

    This work is focused on the preparation and characterization of novel multifunctional structural composites with thermal energy storage (TES) capability. Structural laminates were obtained by combining an epoxy resin, a paraffinic phase change material (PCM) stabilized with carbon nanotubes (CNTs), and reinforcing carbon fibers. The stabilized paraffin kept its ability to melt and crystallize in the laminates, and the melting enthalpy of the composites was proportional to the paraffin weight fraction with a maximum value of 47.4 J/cm3. This thermal response was preserved even after fifty consecutive heatingcooling cycles. Moreover, the thermal conductivity of the laminates through thickness direction resulted to increase proportionally to the content of CNT-stabilized PCM. The capability of the developed TES laminates to contribute to the thermal energy management was also proven by monitoring their cooling rates through thermal imaging. The flexural modulus was only slightly affected by the presence of the PCM, while a decrease of flexural strength, strain at break and interlaminar shear strength was detected. Optical microscopy highlighted that this could be attributed to the preferential location of the PCM in the interlaminar region. The obtained results demonstrated the feasibility of the concept of multifunctional structural TES composites. ©2018 Elsevier Ltd. All rights reserved.

    2018 journal paper

  • Combined effect of fumed silica and metal hydroxides as fire retardants in PE single-polymer composites 2018

    Fredi, Giulia; De Col, A; Dorigato, A; Lopez-Cuesta, J-M; Fambri, L; Pegoretti, A, "Combined effect of fumed silica and metal hydroxides as fire retardants in PE single-polymer composites" in AIP Conference Proceedings, Melville, NY, USA: American Institute of Physics Inc., 2018, p. 020021-1-020021-4. - (AIP CONFERENCE PROCEEDINGS). - ISBN: 9780735416970. Proceedings of: 9th International Conference on Times of Polymers and Composites: From Aerospace to Nanotechnology, Ischia, Naples; Italy, 17–21 June, 2018. - URL: http://scitation.aip.org/content/aip/proceeding/aipcp . - DOI: 10.1063/1.5045883

    This work aimed to study the combined effect of metal hydroxides and fumed silica in enhancing the fire-retardant properties of a polyethylene single-polymer composite. The LLDPE matrix was blended with fumed silica and aluminum or magnesium hydroxides in different weight fractions. The obtained matrices were characterized to select that with the best combination of processability, mechanical and thermal properties, and fire resistance, to produce a single-polymer composite (SPC). The current research is focusing on the selection of the processing parameters for the production of the SPC, and on the characterization of the obtained laminates.

    2018 conference paper

  • Synergistic effects of carbon black and carbon nanotubes on the electrical resistivity of poly(butylene-terephthalate) nanocomposites 2018

    Dorigato, Andrea; Brugnara, Marco; Pegoretti, Alessandro, "Synergistic effects of carbon black and carbon nanotubes on the electrical resistivity of poly(butylene-terephthalate) nanocomposites" in ADVANCES IN POLYMER TECHNOLOGY, v. 37, n. 6 (2018), p. 1744-1754. - URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/adv.21833 . - DOI: 10.1002/adv.21833

    In this study, novel electrically conductive polymeric nanocomposites based on polybutylene terephthalate (PBT) filled with commercial carbon black (CB) and carbon nanotubes (CNTs) at different relative ratios have been investigated. Field emission scanning electron microscope (FESEM) analysis revealed how a good nanofiller dispersion was obtained both by introducing CB and CNT. Melt flow index measurements highlighted that the processability of the nanocomposites was heavily compromised at elevated filler amounts, and the viscosity percolation threshold was established at 3 wt% for CNTs and between 6 and 10 wt% for CB nanocomposites. Differential scanning calorimetry (DSC) measurements evidenced how the presenceof CNT slightly increased the glass transition temperature of the materials, and an increase of 12°C of the crystallization temperature was obtained with a CNT amount of 6 wt%. Also the crystalline fraction was increased upon CNT addition. Electrical resistivity measurements evidenced that the most interesting results were obtained for nanocomposites with a total filler content of 6 wt% and a CNT/CB relative amount equal to 2:1. The synergistic effect obtained with the combination of both nanofillers allowed the achievement of a rapid surface heating through Joule effect even at applied voltages of 2 V.

    2018 journal paper