Spin Pet Srl

Marina di Pisa, Italy

Spin Pet Srl

Marina di Pisa, Italy
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Filpi A.,University of Pisa | Boccia M.,Acta S.p.A. | Pucci A.,University of Pisa | Pucci A.,CNR Institute of Neuroscience | And 2 more authors.
E-Polymers | Year: 2013

In this work, different amines (bifunctional, as diazabicyclo[2.2.2]octane (Dabco) and monofunctional, as N-methylimidazole or trimethylamine) were utilized for the amination of benzyl chloride-grafted polystyrene-b- poly(butadiene)-bpolystyrene triblock copolymers (SBS-g-VBC). The use of Dabco solutions in mixture with variable amounts of monoamine or at different concentration allowed to modulate the degree of crosslinking of the SBS-based membranes and their electrochemical parameters. More specifically, tuning Dabco concentration permitted the reduction of water uptake without significantly affecting ionic conductivity.

Bertoldo M.,CNR Institute for Chemical and Physical Processes | Nazzi S.,CNR Institute for Chemical and Physical Processes | Zampano G.,University of Pisa | Zampano G.,A. Menarini Industrie Farmaceutiche Riunite Srl | And 2 more authors.
Carbohydrate Polymers | Year: 2011

A new light responsive polysaccharide based on a precisely defined N-phthaloyl chitosan with a covalent bound photochromic spiropyran moiety in C-6 was synthesized through Cu(I) catalyzed azide-alkyne [3 + 2] dipolar cycloaddition between 6-azido-6-deoxy, N-phthaloyl chitosan and a new spiropyran derivative containing an alkynyl group (SPCC). The reaction product was characterized by NMR and FT-IR spectroscopies for confirming the molecular structure. The UV-vis spectroscopy analyses of films prepared by solution casting on glass from DMF solutions of the functionalized polysaccharide, before and after exposure to an UV lamp (in the 280-350 nm spectral range) or sunlight, showed very slow thermal decay of the photo-induced colored form which was substantially maintained after few months at room temperature. On the contrary, fast color fading was observed for SPCC in ethanol or diethyl ether solution where the color disappeared completely in few minutes at the same temperature. Intermediate color durability was found in diethyl ether suspensions, which indicated the solid polysaccharide phase as responsible of the observed color durability. Considering that the absorption spectra of the polymers are similar under the different conditions examined, the observed effect in the solid state is discussed with reference to the chromophore environment providing molecular and supramolecular hindrance by steric effect and weak binding. © 2011 Elsevier Ltd. All rights reserved.

Signori F.,CNR Institute for Chemical and Physical Processes | Signori F.,University of Pisa | Badalassi M.,University of Pisa | Bronco S.,CNR Institute for Chemical and Physical Processes | Ciardelli F.,Spin Pet Srl
Polymer | Year: 2011

Maleic anhydride (MAH), trans cinnamic acid (AcCin) and ethyl cinnamate (EtCin) were radically graft onto poly(butylene succinate-co-adipate) (PBSA). Samples were prepared in Brabender at 175 °C by addition of increasing amounts of MAH, AcCin, EtCin and their combinations, i.e. MAH/AcCin and MAH/EtCin, setting DCP content in the 0.2-0.6 wt% range. Monomer grafting was quantitatively determined by FT-IR. MAH grafting degrees (FDM) resulted up to 1 mol%. Conversely, AcCin grafting degrees (FDA) were found almost negligible in all cases. EtCin was found grafted in the 0.3-1.0 mol% range when the binary system MAH/EtCin was applied. Same MAH feeds returned almost doubled MAH grafting degrees (FDM) when AcCin was the stoichiometric co-agent, and even three times higher FDM when EtCin was the stoichiometric co-agent. On accounts of all the collected results, a kinetic model of the investigated systems is proposed. © 2011 Elsevier Ltd. All rights reserved.

Faraj M.,University of Pisa | Elia E.,University of Pisa | Boccia M.,Acta S.P.A. | Filpi A.,University of Pisa | And 5 more authors.
Journal of Polymer Science, Part A: Polymer Chemistry | Year: 2011

In this work, the functionalization of polystyrene-b-poly(butadiene)-b- polystyrene triblock copolymer (SBS) with vinylbenzyl chloride and benzoyl peroxide (BPO) or α,α′-azo-bis-isobutyronitrile (AIBN) as free radical initiators was reported. The functionalization degree (FD), calculated by 1H NMR spectroscopy and confirmed by elemental analysis, was highly tunable (from 4 to 10 mol %) and positively correlated to the starting percentage of radical initiator. More specifically, at the same initiator molar percentage grafting efficiency is higher using BPO rather than AIBN. Quaternization reaction of the grafted benzyl chloride groups with the bifunctional tertiary amine 1,4-diazabicyclo[2.2.2]octane (Dabco) led to a chemically and thermally stable homogeneous anion-exchange membrane. Electrochemical parameters were evaluated for Dabco-quaternized grafted copolymers having different FDs, and compared with a commercial Tokuyama benchmark membrane. Experimental data showed a positive correlation between FD and both water swelling and ionic conductivity. Best trade-off between ionic conductivity and water swelling was found for membrane having FD 9.1 mol %, which conductivity is comparable with the Tokuyama benchmark one and water uptake is only slightly higher. The results are discussed based on the molecular parameters with particular reference to ionic content and distribution. © 2011 Wiley Periodicals, Inc.

Ciardelli F.,Spin Pet S.r.l. | Ruggeri G.,University of Pisa | Ruggeri G.,Consortium for Science and Technology of Materials | Pucci A.,University of Pisa | And 2 more authors.
Chemical Society Reviews | Year: 2013

The detection of mechanical stress in polymeric materials through optical variations has attracted considerable interest over the past ten years. In this tutorial review, the current state of knowledge concerning the preparation of polymers with mechanochromic features is summarized. Two types of procedures are illustrated and thoroughly discussed along with their respective structure-property relationships: the first resides in the physical dispersion of the dye in the form of supramolecular aggregates in a preformed polymer matrix; the second involves the covalent insertion of chromophoric units into the macromolecule backbone or side chains. Herein we review the simplicity of the preparative routes available, and their influence over the properties of the resulting dye-polymer systems, by focussing on the most illustrative examples described in the literature. Special reference is made to stimuli-responsiveness as a mechanical means towards innovative smart and intelligent materials. © 2013 The Royal Society of Chemistry.

Sulcis R.,University of Pisa | Sulcis R.,Italian Institute of Technology | Lotti L.,University of Pisa | Lotti L.,Dow Italia S.r.l. | And 4 more authors.
Journal of Applied Polymer Science | Year: 2014

Novel hybrid materials composed by a high density polyethylene (HDPE) matrix and powdered rubber coming from scrap tyres (ground tyre rubber [GTR]) were prepared. Two methods were followed: ethylene was polymerized by a metallocene catalyst (Cp2ZrCl2/methylaluminoxane) in the presence of a toluene dispersion of the filler (in-situ polymerization); and the ethylene was polymerized out after supporting the aluminum-based co-catalyst onto the rubber particles surface (polymerization filling technique). The experimental conditions were varied in order to achieve the best catalyst productivity. All the synthesized composites were characterized in order to investigate the occurrence and the extent of interactions between HDPE macromolecular chains and the GTR components and their effects onto the final properties, by comparison with a composite where GTR was included into the matrix through blending in the melt. Scanning electron microscopy, atomic force microscopy, and solvent extractions were performed to this aim. The amount of thermoplastic matrix bonded to the filler was determined, and the extracted polymer was characterized by size exclusion chromatography and differential scanning calorimetry. Finally, stress-strain behavior of the composites obtained, respectively, by catalytic polymerization and melt mixing was compared. © 2014 Wiley Periodicals, Inc.

Signori F.,CNR Institute for Chemical and Physical Processes | Boggioni A.,CNR Institute for Chemical and Physical Processes | Righetti M.C.,CNR Institute for Chemical and Physical Processes | Rondan C.E.,Instituto Tecnologic del Plastico | And 3 more authors.
Macromolecular Materials and Engineering | Year: 2015

Aiming at the tuning of thermo-mechanical features by chemical cross-linking, a biopolyester commercial blend based on poly(lactic acid) (PLA) with poly(butylene adipate-co-terephthalate)(PBAT) (ecovio®T2280, BASF) was processed in Brabender in the presence of dicumyl peroxide (DCP, 0-0.2 wt.-%). The effect of DCP addition was investigated and rationalized by means of solubility tests and gel content evaluation, as well as rheological, mechanical, and molecular weight analysis of the prepared compounds. Moreover, detailed DSC and TMDSC investigations provided a deep insight into the structural modifications occurred at the macromolecular level. We found that chain branching as well as cross-linking occurred in the samples processed in the presence of DCP, thus returning compounds having increased toughness and modulated crystalline content and thermal behavior. Noteworthy, the presence of specific, undisclosed additives, triggers the occurrence of peculiar behaviors in the ecovio® commercial blend, not previously observed in model PLA/PBAT blends of similar composition. Despite only partially soluble in chloroform, the new ecovio® DCP-modified compounds still remained workable in the melt, thus providing a suitable, simple and economically affordable strategy to finely modulate the thermo-mechanical properties starting from a commercially available, compostable compound. (Graph Presented). © 2014 Wiley-VCH Verlag GmbH & Co. KGaA.

Amaro L.P.,CNR Institute of Chemistry of organometallic Compounds | Coiai S.,CNR Institute of Chemistry of organometallic Compounds | Ciardelli F.,CNR Institute of Chemistry of organometallic Compounds | Ciardelli F.,Spin Pet s.r.l. | Passaglia E.,CNR Institute of Chemistry of organometallic Compounds
Waste Management | Year: 2015

Post-consumer poly(ethylene therephthalate) (PET) obtained from milled water bottles was chemically degraded by glycolysis, using suitable amounts of diethylene glycol (DEG) and Ca/Zn stearate as catalyst system. The process was carried out by employing a melt mixer as the chemical reactor, which is the facility generally used for plastic compounding. The degraded PET products were first characterized from structural and thermal point of view by Fourier transform infrared spectroscopy (FTIR), Proton nuclear magnetic resonance (1H NMR), Size exclusion chromatography (SEC) Differential scanning calorimetry (DSC) and Thermogravimetric analysis (TGA), and thereafter used alone or together with di(2-ethylhexyl) phthalate (DEHP) in poly(vinyl chloride) PVC formulations. The plasticization was, in fact, accomplished by using a binary system consisting of DEHP as primary plasticizer and a degraded PET product as secondary plasticizer (SP). The obtained materials were characterized through the main methods used to assess flexible PVC compounds: hardness in Shore A scale, thermal properties and quantitative migration of the plasticizer. The solid secondary plasticizer obtained from post-consumer PET improves both the processing characteristics and the thermal stability of the final flexible PVC compounds while maintaining their hardness within the top values of the Shore A scale. In addition, a considerable reduction of the plasticizers migration (23%) was obtained by optimizing the formulation. © 2015 Elsevier Ltd.

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