Nylon 6,6/graphene nanoplatelet composite films obtained from a new solvent

Papadopoulou, Evie L.; Pignatelli, Francesca; Marras, Sergio; Marini, Lara; Davis, Alexander; Athanassiou, Athanassia

doi:10.1039/c5ra23647a

Cited by 62 publications

(70 citation statements)

References 42 publications

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“…The decreases of E with the loading of few-layers black phosphorus superior in f-BP0.01 and f-BP0.05% is associated to flakes aggregation [69][70][71], as corroborated by SEM and Raman mappings shown in Fig. 4.…”

Section: Resultssupporting

confidence: 56%

Single-step exfoliation and functionalization of few-layers black phosphorus and its application for polymer composites

et al. 2019

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A B S T R A C TWe demonstrate the large scale exfoliation of bulk black phosphorus into few-layers black phosphorus. We use wet-jet mill (WJM) as an industrially scalable exfoliation technique. In order to avoid the degradation by oxidation of the exfoliated flakes, the few-layers black phosphorus is protected by functionalisation (with 4-bromobenzene-diazonium tetrafluoroborate) during the exfoliation process. We used the exfoliated and functionalised flakes as fillers in a polymethyl methacrylate matrix to test the mechanical endurance, obtaining an improvement in the Young's modulus of 106% compared to the bare polymer. These data support the development of black phosphorus materials as 2D-polymer fillers and performance-enhancers.

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Section: Resultssupporting

confidence: 56%

Single-step exfoliation and functionalization of few-layers black phosphorus and its application for polymer composites

et al. 2019

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“…On the other hand, solvent blending provides a simple route to incorporate GO into polymer matrices, achieving high degree of dispersion but, conversely, the use of surfactants may often affect polymer properties and pose serious issues in terms of solvent removal and environmental risks [4,5]. Recently, many efforts have been devoted to the development of new solvents, capable to enhance the properties of polyamide-graphene nanocomposites [6].…”

Section: Introductionmentioning

confidence: 99%

A green method to prepare nanosilica modified graphene oxide to inhibit nanoparticles re-aggregation during melt processing

Scaffaro

2017

Chemical Engineering Journal

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A graphene oxide-silica nanohybrid (GOS), self-assembled into a lasagna-like structure, was prepared in water and used as a filler for the melt preparation of polyamide 6 (PA6)-based nanocomposites. For sake of comparison, PA6-based materials were prepared under the same processing conditions by adding GO only or a physical mixture of GO and silica (GO+S). All the materials were characterized from a morphological, spectroscopic, thermal, dynamic-mechanical (DMA) and mechanical point of view. For all the nanocomposites, the interphase was studied either by analyzing loss factor plots coming from DMA measurements and by implementing a novel approach, i.e. combining solvent extraction, SEM and EDX measurements. While GO and GO+S showed an almost negligible effect on the macroscopic features of PA6, due to lack of dispersion, PA6-GOS ternary nanocomposites displayed an outstanding enhancement of mechanical and thermo-mechanical performance. This feature is likely due to the formation of an extended and strong interphase. In fact, the silica layers intercalated between GO lamellae played as an exfoliating agent, thus proving to be particularly efficient in avoiding self-aggregation of GO sheets, while those covalently attached to basal planes of GO acted as a rivet, capable to interlock the surrounding polymer chains. Finally, with respect to other techniques commonly adopted for the fabrication of polymer-graphene nanocomposites, the green route herein proposed does not involve any toxic solvent nor time-consuming protocols, and allows achieving remarkable improvements in stiffening (up to +180%), strengthening (up to +210%) and toughening (up to +210%) at extremely low filler contents (0.25% or 0.5%).

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“…Aliphatic polyamides (PAs), also called nylons, are a class of semicrystalline polymers that contain amide groups which are intercalated along linear alkane chains [1]. Solution processing of aliphatic PAs is quite challenging due to the fact that only a few solvents, such as formic acid (FA) and cresol [2] or fluoric solvents [3], can dissolve them. All of the solvents being used for the dissolution of PAs have severe environmental challenges.…”

Section: Introductionmentioning

confidence: 99%

“…All of the solvents being used for the dissolution of PAs have severe environmental challenges. A few attempts have been made [2] to replace the existing solvents or propose new solvents. Papadopoulou et al [2] mixed FA with trifluoroacetic acid and acetone.…”

Section: Introductionmentioning

confidence: 99%

New Solvent for Polyamide 66 and Its Use for Preparing a Single-Polymer Composite-Coated Fabric

Jabbari

Skrifvars

Åkesson

et al. 2018

International Journal of Polymer Science

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Polyamides (PAs) are one of the most important engineering polymers; however, the difficulty in dissolving them hinders their applications. Formic acid (FA) is the most common solvent for PAs, but it has industrial limitations. In this contribution, we proposed a new solvent system for PAs by replacing a portion of the FA with urea and calcium chloride (FAUCa). Urea imparts the hydrogen bonding and calcium ion from the calcium chloride, as a Lewis acid was added to the system to compensate for the pH decrease due to the addition of urea. The results showed that the proposed solvent (FAUCa) could readily dissolve PAs, resulting in a less decrease in the mechanical properties during the dissolution. The composite prepared using the FAUCa has almost the same properties as the one prepared using the FA solution. The solution was applied on a polyamide 66 fabric to make an all-polyamide composite-coated fabric, which then was characterized. The FAUCa solution had a higher viscosity than the one prepared using the neat FA solvent, which can be an advantage in the applications which need higher viscosity like preparing the all-polyamide composite-coated fabric. A more viscous solution makes a denser coating which will increase the water /gas tightness. In conclusion, using the FAUCa solvent has two merits: (1) replacement of 40% of the FA with less harmful and environmentally friendly chemicals and (2) enabling for the preparation of more viscous solutions, which makes a denser coating.

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Nylon 6,6/graphene nanoplatelet composite films obtained from a new solvent

Abstract: New solvent results in non-porous nylon 66 films. Addition of graphene results in great improvement of electrical and mechanical properties.

Cited by 62 publications

References 42 publications

Single-step exfoliation and functionalization of few-layers black phosphorus and its application for polymer composites

Single-step exfoliation and functionalization of few-layers black phosphorus and its application for polymer composites

A green method to prepare nanosilica modified graphene oxide to inhibit nanoparticles re-aggregation during melt processing

New Solvent for Polyamide 66 and Its Use for Preparing a Single-Polymer Composite-Coated Fabric

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