Search results for: Ernesto Di Maio

Items from 1 to 20 out of 35 results

article

Topologically Optimized Graded Foams

Paolo Iaccarino, Elvira Maresca, Simone Morganti, Ferdinando Auricchio, more

Advanced Engineering Materials > 26 > 11 > n/a - n/a

Topologically Optimized Graded Foams In article number 2301798, Ernesto Di Maio and co‐workers show that combining topology optimization and gas foaming produces multi‐graded polymeric foams with tailored density distribution. 3D density maps, optimized according to a specific objective function, are produced through gas foaming in the blink of an eye. Results demonstrate a 210% stiffness increase...

article

Topologically Optimized Graded Foams

Paolo Iaccarino, Elvira Maresca, Simone Morganti, Ferdinando Auricchio, more

Advanced Engineering Materials > 26 > 11 > n/a - n/a

The adoption of Nature‐inspired strategies to improve materials has fostered the introduction of cavities. But how to mass‐produce structures in which a complex architecture of cavities is point‐to‐point fine‐tuned to the local and global application requirements? To this aim, the use of a procedure based on topology optimization and gas foaming is herein reported. As an example case, a polymeric...

article

Gas foaming of polyphenyl sulfone: Effect of the blowing agents and operating parameters

Paolo Trucillo, Fabrizio Errichiello, Ernesto Di Maio

Journal of Applied Polymer Science > 140 > 37 > n/a - n/a

Polyphenyl sulfone (PPSU) is a highly stable and rigid polymer with good chemical and mechanical resistance used in automotive and aerospace industries in high‐temperature applications during long‐operating cycles. PPSU foams are applied as core materials in lightweight composites ensuring high strength, fire resistance, thermal and acoustic insulation. In this paper, PPSU slabs are foamed using CO...

article

Cover Image, Volume 140, Issue 37

Paolo Trucillo, Fabrizio Errichiello, Ernesto Di Maio

Journal of Applied Polymer Science > 140 > 37 > n/a - n/a

This cover page was created by Dr. Paolo Trucillo, Dr. Fabrizio Errichiello, and Prof. Ernesto Di Maio. Our idea is to give a visual appearance of the PPSU before and after foaming at 220°C and 100 bar until saturation. The other goal of this image is to directly show the different apparent diffusivity of carbon dioxide, nitrogen, and helium, used as blowing agents at low sorption times. This also...

article

A design tool for core‐back timing in foam injection molding

Kentaro Taki, Marco Menale, Giovanni Pisante, Ernesto Di Maio

Journal of Applied Polymer Science > 139 > 45 > n/a - n/a

A visual observation experiment mimicking the pressure history in foam injection molding was utilized to infer the bubbles formation in core‐back operations. The different stages of bubble nucleation, dissolution, and re‐nucleation, corresponding to injection, packing, and core‐back opening, respectively, were studied. A reduction of the number density of re‐nucleated bubbles with respect to first...

article

Sintering graded foamed beads: Compressive properties

Fabrizio Errichiello, Aniello Cammarano, Ernesto Di Maio, Luigi Nicolais

Journal of Applied Polymer Science > 139 > 18 > n/a - n/a

Designing the foam structures in terms of density and morphology gives the chance to tune their mechanical and functional properties to the specific application. Nowadays, this design has been leveled up by the introduction of graded foams which are characterized by spatially nonuniform densities and/or morphologies. Graded foams have proved superior compared to uniform one in numerous examples and...

article

Heterogeneous Bubble Nucleation by Homogeneous Crystal Nuclei in Poly(l‐Lactic Acid) Foaming

Alessandra Longo, Ernesto Di Maio, Maria Laura Di Lorenzo

Macromolecular Chemistry and Physics > 223 > 4 > n/a - n/a

A novel method to enhance and control bubble nucleation in poly(l‐lactic acid) (PLLA) foaming, not relying on external nucleating agents, is presented. Amorphous PLLA is annealed at temperatures close to its glass transition, to allow local alignment of polymer chains in the form of nanosized aggregates, called homogeneous crystal nuclei (HCN). PLLA containing HCN is then foamed after sorption of...

article

Early bubble coalescence in thermoplastic foaming

Daniele Tammaro, Ernesto Di Maio

Materials Letters > 2018 > 228 > C > 459-462

In the underlying literature, bubble coalescence has been so far observed at the latest foaming stages, where bubble growing causes large extensional loads on the polymer film between two neighboring bubbles and eventually leads to the film rupture and to the merging of the two bubbles in a single one. This phenomenon is responsible for the coarsening of the foam morphology and, in turn, the worsening...

article

Microcellular foaming of arabinoxylan and PEGylated arabinoxylan with supercritical CO2

Linda Härdelin, Anna Ström, Ernesto Di Maio, Salvatore Iannace, more

Carbohydrate Polymers > 2018 > 181 > C > 442-449

In this study, arabinoxylan extracted from barley husks was reacted with polyethylene glycol (PEG) of various molecular weights to introduce an internal plasticizer into the polymer matrix. A successful PEGylation reaction was identified using FTIR and elemental analysis. Thermal and mechanical properties were studied using dynamic mechanical analysis, which revealed that the attachment of PEG chains...

article

Mass transport and physical properties of polymeric methylene diphenyl diisocyanate/CO2 solutions

Maria Rosaria Di Caprio, Barbara Immirzi, Ernesto Di Maio, Sara Cavalca, more

Fluid Phase Equilibria > 2018 > 456 > C > 116-123

Polyurethane foams are typically obtained by reacting a polyisocyanate with a polyol and the foamed structure derives from a blowing reaction concurrent to the polymerization reaction. The blowing stage makes use of chemical and physical blowing agents, among which ozone-depleting or flammable gases are being substituted with eco-friendly and safe ones, such as CO₂. To allow a more educated use of...

article

Carbon nanotubes in microwave foaming of thermoplastics

Elham Rezvanpanah, S. Reza Ghaffarian Anbaran, Ernesto Di Maio

Carbon > 2017 > 125 > C > 32-38

In this work, we introduce the use of selective microwave heating to solve the problems of conventional heating systems, such as non-uniformity and thickness restriction, in classical thermoplastic foaming methods. To do so, carbon nanotubes (CNTs) are used as microwave absorbers in a transparent polymer media. When irradiated, CNTs are responsible for a local temperature increase in the polymer/gas...

article

Modeling and simulation of viscoelastic film retraction

Massimiliano M. Villone, Gaetano D’Avino, Ernesto Di Maio, Martien A. Hulsen, more

Journal of Non-Newtonian Fluid Mechanics > 2017 > 249 > C > 26-35

In this paper, we investigate the retraction of a circular viscoelastic liquid film with a hole initially present in its center by means of finite element numerical simulations. We study the whole retraction process, aiming at understanding the hole opening dynamics both when the hole does not feel any confinement and when it interacts with the solid wall bounding the film. The retraction behavior...

article

A pressure vessel for studying gas foaming of thermosetting polymers: sorption, synthesis and processing

Maria Rosaria Di Caprio, Daniele Tammaro, Ernesto Di Maio, Sara Cavalca, more

Polymer Testing > 2017 > 62 > C > 137-142

We herein report the design of an apparatus for studying the concurrent chemo-physical processes occurring during gas foaming of thermosetting polymers. In particular, to address the recent interest in combining the gas (physical) foaming with the classical (chemical) polyurethane foaming, a novel instrumented pressure vessel was designed for investigating: i) gas sorption under high pressure on the...

article

Bio‐nanocomposites: Dielectric Properties of Sustainable Nanocomposites Based on Zein Protein and Lignin for Biodegradable Insulators (Adv. Funct. Mater. 8/2017)

Maria Oliviero, Reza Rizvi, Letizia Verdolotti, Salvatore Iannace, more

Advanced Functional Materials > 27 > 8 > n/a - n/a

Bio‐nanocomposite films based on the vegetable protein, zein, and natural fillers, lignin derivatives, are potential candidates to produce biodegradable dielectric materials for transient, temporary, electronics. The dielectric properties of the biodegradable dielectrics can be tuned by modulating the film formulation and the typology of Lignin derivatives, as explored by Letizia Verdolotti co‐workers...

article

Dielectric Properties of Sustainable Nanocomposites Based on Zein Protein and Lignin for Biodegradable Insulators

Maria Oliviero, Reza Rizvi, Letizia Verdolotti, Salvatore Iannace, more

Advanced Functional Materials > 27 > 8 > n/a - n/a

Two types of lignin, alkali lignin and lignosulfonic acid sodium salt, are blended into thermoplastic zein through melt mixing in order to develop biodegradable insulator materials for multifunctional applications in electronics. The effects of lignin type and content on the dielectric properties of the resulting bio‐nanocomposites are investigated. The results indicate that, by modifying the structural...

article

Polyether polyol/CO2 solutions: Solubility, mutual diffusivity, specific volume and interfacial tension by coupled gravimetry-Axisymmetric Drop Shape Analysis

Maria Rosaria Di Caprio, Giovanni Dal Poggetto, Maria Giovanna Pastore Carbone, Ernesto Di Maio, more

Fluid Phase Equilibria > 2016 > 425 > C > 342-350

In this work we investigate the sorption of CO₂ in a formulated polyether polyol, typically used to obtain rigid polyurethane foams when it reacts with isocyanates. In particular, by using a fully-experimental, coupled gravimetry-Axisymmetric Drop Shape Analysis, solubility, mutual diffusivity, specific volume and interfacial tension of polyol/CO₂ solutions have been measured at 35 °C and at CO₂ pressures...

article

Morphology modulation of gas‐foamed, micrometric, hollow polystyrene particles

Vincenzo Contaldi, Luigi Imperato, Silvia Orsi, Ernesto Di Maio, more

Journal of Applied Polymer Science > 133 > 48 > n/a - n/a

In this article, we reports the effects of the processing conditions on the morphological and hollow attributes of polystyrene micrometric hollow particles produced by the use of a recently developed technique based on the gas foaming of spherical, dense particles. By modulating the foaming temperature and saturation pressure, we produced hollow particles with different attributes in terms of hollow...

article

Polyurethane-silica hybrid foam by sol–gel approach: Chemical and functional properties

Letizia Verdolotti, Marino Lavorgna, Raffaele Lamanna, Ernesto Di Maio, more

Polymer > 2015 > 56 > Complete > 20-28

Hybrid foams based on polyurethane and polysiloxane-domains were designed in terms of chemical structure and hierarchical morphology to improve the thermal insulation capability of conventional polyurethane foams. Polysiloxane-domains by sol–gel approach reacted with polyols to produce a polysiloxane-reactive-adduct, which completed its formation into polysiloxane aerogel-like structure during the...

article

On the unexpected non-monotonic profile of specific volume observed in PCL/CO2 solutions

Maria Giovanna Pastore Carbone, Ernesto Di Maio, Pellegrino Musto, Andreas Braeuer, more

Polymer > 2015 > 56 > Complete > 252-255

Recently, the specific volume of molten solutions of polycaprolactone and carbon dioxide (PCL/CO ₂ ) was measured by coupling gravimetric measurements with the observation of the swelling of a pendant drop. Quite interestingly, this approach highlighted a non-monotonic dependence of the specific volume of the solution on CO ₂ pressure. Herein, in order to get a molecular insight into...

article

Thermoplastic Processing of Blue Maize and White Sorghum Flours to Produce Bioplastics

Grissel Trujillo-de Santiago, Cecilia Rojas-de Gante, Silverio García-Lara, Letizia Verdolotti, more

Journal of Polymers and the Environment > 2015 > 23 > 1 > 72-82

In this study, we evaluated the feasibility of producing bioplastics from blue maize (BM) and white sorghum (WS) flours by thermoplasticization using sorbitol and glycerol as plasticizers and by using extrusion and compression molding. The analyzed variables were screw speed rotation (50–70 rpm), extrusion temperature (100–140 °C), number of extrusion passes (1 or 2), and chemical modification of...

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INFONA - science communication portal

Search results for: Ernesto Di Maio

Topologically Optimized Graded Foams

Topologically Optimized Graded Foams

Gas foaming of polyphenyl sulfone: Effect of the blowing agents and operating parameters

Cover Image, Volume 140, Issue 37

A design tool for core‐back timing in foam injection molding

Sintering graded foamed beads: Compressive properties

Heterogeneous Bubble Nucleation by Homogeneous Crystal Nuclei in Poly(l‐Lactic Acid) Foaming

Early bubble coalescence in thermoplastic foaming

Microcellular foaming of arabinoxylan and PEGylated arabinoxylan with supercritical CO2

Mass transport and physical properties of polymeric methylene diphenyl diisocyanate/CO2 solutions

Carbon nanotubes in microwave foaming of thermoplastics

Modeling and simulation of viscoelastic film retraction

A pressure vessel for studying gas foaming of thermosetting polymers: sorption, synthesis and processing

Bio‐nanocomposites: Dielectric Properties of Sustainable Nanocomposites Based on Zein Protein and Lignin for Biodegradable Insulators (Adv. Funct. Mater. 8/2017)

Dielectric Properties of Sustainable Nanocomposites Based on Zein Protein and Lignin for Biodegradable Insulators

Polyether polyol/CO2 solutions: Solubility, mutual diffusivity, specific volume and interfacial tension by coupled gravimetry-Axisymmetric Drop Shape Analysis

Morphology modulation of gas‐foamed, micrometric, hollow polystyrene particles

Polyurethane-silica hybrid foam by sol–gel approach: Chemical and functional properties

On the unexpected non-monotonic profile of specific volume observed in PCL/CO2 solutions

Thermoplastic Processing of Blue Maize and White Sorghum Flours to Produce Bioplastics

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