Institute for Polymers

Pozzuoli, Italy

Institute for Polymers

Pozzuoli, Italy
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Angelini S.,Institute for Polymers | Ingles D.,University of Perugia | Gelosia M.,University of Perugia | Cerruti P.,Institute for Polymers | And 5 more authors.
Journal of Cleaner Production | Year: 2017

A one-pot route to extract and chemically modify lignin from a pre-treated Phragmites australis lignocellulosic biomass is proposed herein. The lignocellulosic biomass was first pre-treated through steam explosion at two different severity factors. Lignin was then extracted from the steam-exploded biomasses through a microwave-assisted organosolv extraction method, solely using γ-valerolactone as solvent. The most severe steam explosion condition yielded a delignification of 78%. Morphological analysis, spectroscopic investigation and thermal characterization showed that essentially pure lignin was extracted through this process. Lignin was then chemically modified in the γ-valerolactone extraction solution, through acetylation and Mannich condensation. This work provides proof-of-evidence that pure lignin can be solvent-extracted in high yields from a pre-treated biomass without the addition of any further chemicals and successfully modified in a one-pot route through a cleaner process. The modified lignin could be used as building block for the development of novel bio-based polymer materials. © 2017 Elsevier Ltd

Touchard F.,University of Poitiers | Boustie M.,University of Poitiers | Chocinski-Arnault L.,University of Poitiers | Gonzalez P.P.,University of Poitiers | And 6 more authors.
International Journal of Structural Integrity | Year: 2017

Purpose - The purpose of this paper is to study the damage induced in "green" and synthetic composites under impact loading. Design/methodology/approach - The study was focussed on epoxy-based composites reinforced with woven hemp or glass fibres. Six assessment techniques were employed in order to analyse and compare impact damages: eye observation, back face relief, terahertz spectroscopy, laser vibrometry, x-ray micro-tomography and microscopic observations. Findings - Different damage detection thresholds for each material and technique were obtained. Damage induced by mechanical and laser impacts showed relevant differences, but the damage mechanisms are similar in both types of impact: matrix cracks, fibre failure, debonding at the fibres/matrix interface and delamination. Damage shape on back surfaces is similar after mechanical or laser impacts, but differences were detected inside samples. Originality/value - The combination of these six diagnoses provides complementary information on the damage induced by mechanical or laser impacts in the studied green and synthetic composites. © Emerald Publishing Limited.

Rea I.,CNR Institute for Microelectronics and Microsystems | Casalino M.,CNR Institute for Microelectronics and Microsystems | Terracciano M.,CNR Institute for Microelectronics and Microsystems | Sansone L.,Institute for Polymers | And 2 more authors.
Optics Express | Year: 2016

Graphene oxide (GO) is a photoluminescent material whose application in integrated optoelectronics has been strongly limited due to poor emission intensity and handling procedures not compatible with standard microelectronic ones. In this work, a hybrid GO-porous silicon (GO-PSi) structure is realized in order to investigate the emission properties of GO infiltrated into an aperiodic porous multilayered matrix. A photoluminescence enhancement by a factor 32, compared to the same amount of GO deposited on a flat silicon surface, is demonstrated. Photoluminescence measurements also show wavelength modulation of the emitted signal. © 2016 Optical Society of America.

Landi G.,Institute for Polymers | Landi G.,University of Salerno | Altavilla C.,Institute for Polymers | Ciambelli P.,University of Salerno | And 3 more authors.
AIP Conference Proceedings | Year: 2015

Insulating materials play a vital role in the design and performance of electrical systems for both steady and transient state conditions. Among the other properties, also in this field, polymer nanocomposites promise to offer exciting improvements. Many studies in the last decade has witnessed significant developments in the area of nanodielectric materials and significant effects of nano-scale fillers on electric, thermal and mechanical properties of polymeric materials have been observed. However, the developments of new and advanced materials to be used the miniaturization of electronic devices fabrication require extensive studies on electrical insulation characteristics of these materials before they can be used in commercial systems. In this work, Polystyrene (PS) composites were prepared by the blend solution method using MoS2@Oleylamine nanosheets as filler. The dielectric properties of the resulting comoposite have been investigated at 300K and in the frequency range between 1000 Hz and 1 MHz. The addition of the MoS2@Oleylamine nanosheets leads to a decreasing of the relative dielectric constant and of the electrical conductivity measured in the voltage range between ±500V. Thanks to a possibility to tune the electrical permittivity with the control of MoS2 concentration, these materials could be used as a low-dielectric material in the microelectronics applications. © 2015 AIP Publishing LLC.

PubMed | Vinča Institute of Nuclear Sciences, Institute for Polymers and University of Belgrade
Type: | Journal: Carbohydrate polymers | Year: 2016

In this study, pectin based films including different amounts of sodium alginate were prepared by casting method. All the films, with and without polyglycerol as plasticizer, were crosslinked with zinc ions in order to extend their potential functionality. The development of junction points, occurring during the crosslinking process with zinc ions, induced the increasing of free volume with following changing in chemico-physical properties of films. The inclusion of alginate in pectin based formulations improved the strength of zinc ions crosslinking network, whereas the addition of polyglycerol significantly improved mechanical performance. Finally, zinc-crosslinked films evidenced antimicrobial activity against the most common exploited pathogens: Staphylococcus Aureus, Escherichia Coli and Candida Albicans. These results suggest that zinc-crosslinked based films can be exploitable as novel bio-active biomaterials for protection and disinfection of medical devices.

Auriemma M.,University of Naples Federico II | Piscitelli A.,University of Naples Federico II | Pasquino R.,University of Naples Federico II | Cerruti P.,Institute for Polymers | And 4 more authors.
AIP Conference Proceedings | Year: 2015

Poly(3-hydroxybutyrate) (PHB) is a biodegradable polymer, whose applicability is limited by its relatively poor mechanical properties and narrow processing window. In this paper, different natural phenol-based additives, including tannic acid (TA), grape bagasse extract (EP), and a lignocellulosic biomass (LC) were used as thermal and processing stabilizers for PHB. The thermal stability of both neat and doped PHB samples was studied by rheology and calorimetry. The experimental results showed that neat PHB massively degrades and that the addition of phenol additives enhances the thermal stability of PHB, preserving the polymer molecular weight after processing. This finding was in agreement with the slower decay in viscosity observed through rheological tests. Physical and chemical interactions between polymer and additive were considered as key factors to interpret the experimental data. LC affected the melt crystallization kinetics of PHB enhancing crystallization upon cooling. This finding suggests that LC was a heterogeneous nucleating agent, potentially able to control the physical aging of PHB. The described results are of interest for the development of sustainable alternatives to synthetic polymer additives, by increasing the applicability of bio-based materials. © 2015 AIP Publishing LLC.

Pannico M.,Institute for Polymers | Rea I.,CNR Institute for Microelectronics and Microsystems | Chandrasekaran S.,University of South Australia | Musto P.,Institute for Polymers | And 2 more authors.
Nanoscale Research Letters | Year: 2016

Porous biosilica from diatom frustules is well known for its peculiar optical and mechanical properties. In this work, gold-coated diatom frustules are used as low-cost, ready available, functional support for surface-enhanced Raman scattering. Due to the morphology of the nanostructured surface and the smoothness of gold deposition via an electroless process, an enhancement factor for the p-mercaptoaniline Raman signal of the order of 105 is obtained. © 2016, The Author(s).

Montane X.,Rovira i Virgili University | Bogdanowicz K.A.,Rovira i Virgili University | Prats-Reig J.,Rovira i Virgili University | Colace G.,Institute for Polymers | And 2 more authors.
Polymer (United Kingdom) | Year: 2016

An evaluation of ion transport in new biomimetic membranes, which are based on dendronised liquid crystalline polyamines is described. Two-step modification of starting polymer allowed preparation of self-supported membranes. Current-Voltage curves confirmed cation permselective nature of these new membranes and size-dependent preferential selectivity in following order: H+ > Na+ > Ag+ > K+. However, in case of chloride solutions, damage of the membranes was observed and was studied using SEM, TEM and 1H NMR techniques. Selectivity of self-supported systems was compared with hybrid systems based on similar liquid crystalline polyamines and showed lower selectivity values in case of new membranes. Taking into account improved mechanical stability, extended liquid crystalline behaviour and higher clearing temperature values, these materials seem to address all disadvantages of hybrid systems, therefore are complementary in terms of practical application requiring selective ion transport. © 2016 Elsevier Ltd

Angelini S.,Institute for Polymers | Cerruti P.,Institute for Polymers | Immirzi B.,Institute for Polymers | Scarinzi G.,Institute for Polymers | Malinconico M.,Institute for Polymers
European Polymer Journal | Year: 2016

This paper deals with the valorization of a lignocellulosic biomass (LC), biowaste from the second generation bioethanol production process. LC was processed in order to isolate its main components: holocellulose (HC) and acid-insoluble lignin (IL). To obtain a biomass free of organic extractives (TE) and low molecular weight polar compounds (W), LC was also subjected to solvent extraction with toluene/ethanol and water. IL, HC and LC were characterized by SEM, FTIR and 13C MAS-NMR. The morphological and structural analysis evidenced successful separation of the two main fractions of the lignocellulosic biomass. LC and its derivatives were used as fillers in poly(3-hydroxybutyrate) (PHB). The blends were characterized through rotational rheometry and DSC. Moreover, the samples were also thermally treated at 190°C, and the effects of the thermal processing on the matrix molecular weight was evaluated by GPC. The addition of IL to PHB affected its rheological properties, significantly enhancing melt stability due to the formation of a percolated filler network within the matrix. Furthermore, SEM analysis demonstrated homogeneous dispersion of the filler and good interfacial adhesion with the matrix. LC and TE acted as pro-degrading agents toward PHB matrix causing a decrease in molecular weight of the polymer during the thermal treatment. The DSC analysis showed that LC, HC, W and TE promoted the polymer melt crystallization, potentially enabling to control physical aging of PHB. To sum up, this study provides an insight on the effect of a lignocellulosic biowaste and its derivatives on the properties of a naturally occurring, biodegradable polyester. © 2016 Elsevier Ltd. All rights reserved.

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