Poly-m-aramid nanofiber mats: Production for application as structural modifiers in CFRP laminates

Mazzocchetti, Laura; D’Angelo, Emanuele; Benelli, Tiziana; Belcari, Juri; Brugo, Tommaso Maria; Zucchelli, Andrea; Giorgini, Loris

doi:10.1063/1.4949591

Cited by 6 publications

(11 citation statements)

References 6 publications

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“…Carbon nanofibers/nanotubes (CNFs/CNTs) proved to be the most effective solution in terms of mechanical reinforcement [10][11][12], but their difficult mixing process with the resin [13] and serious risks for human health [14] make them unsuitable in many cases. Polymers present several advantages compared to CNF/CNT, and the authors of present paper have a successful history of reinforcing composite laminates' interfaces using polymeric nanofibers [15][16][17][18], in particular Nylon 6,6 [19][20][21][22][23]. The academic community produced accurate research on nanomodified composites, but some aspects still need to be further investigated: in particular this paper aims to study nanointerleaved laminates subjected to cycling loads, which is a topic for only few papers can be found in literature [10][11][12]24].…”

Section: Introductionmentioning

confidence: 98%

Study on Mode I fatigue behaviour of Nylon 6,6 nanoreinforced CFRP laminates

Brugo

Minak

Zucchelli

et al. 2017

Composite Structures

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The benefits of interleaving polymeric electrospun nanofibers in between laminae of composite structure have been widely demonstrated in the past several years. Among the work that still has to be done, this paper aims to study delamination propagation of virgin and nanomodified specimens under Mode I fatigue loading. A 40-micron thick layer of Nylon 6,6 nanofibers have been produced and interleaved in carbon fiber-epoxy resin composite laminates; static and dynamic double cantilever tests have been performed to determine delamination growth onset and crack propagation rate vs. maximum energy release rate respectively. Nanomodified specimens exhibited improved delamination resistance during both the tests: delamination toughness increased 130% and cracks propagated 36 to 27 times slower than virgin interfaces. The benefits of the nanointerleave and its working mechanism have been explained using micrographs and SEM images, which revealed a double-stage reinforce mechanism

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Section: Introductionmentioning

confidence: 98%

Study on Mode I fatigue behaviour of Nylon 6,6 nanoreinforced CFRP laminates

Brugo

Minak

Zucchelli

et al. 2017

Composite Structures

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“…PMIA can be solubilized in the presence of inorganic salts (LiCl) and can be easily processed to produce nanofibrous membranes. The production of nanofibers via electrospinning starting from PMIA solution has been already approached and optimized , and nanofibers can be obtained with a significantly different extent of orientation both by playing on the processing and environmental parameters or, as in the present case, by simply varying the rotation speed of the rotating drum used for accumulating and recovering the nanofibers. The difference in the fibers alignment could significantly modify the fire response of the final material, when used as outer coating: indeed, membranes based on randomly oriented fibers would guarantee a isotropic behavior to the coating layer, while the aligned ones are far better behaving in a single direction, while the cross‐sectional behavior might suffer from the poor cohesion of the fibers.…”

Section: Resultsmentioning

confidence: 99%

“…In the first case, fibers were collected at a slow rotation of the drum (about 60 rpm), in the latter a speed of 2,500 rpm was applied to guarantee a prevailing alignment. Nanofibrous mats were finally washed with distilled water and dried at 70°C in order to remove LiCl salt residue, as previously reported ; thickness of washed fibers membranes decreases down to about 50 μm.…”

Section: Methodsmentioning

confidence: 99%

A New Wood Surface Flame‐Retardant Based on Poly‐m‐Aramid Electrospun Nanofibers

Merighi

Mazzocchetti

Benelli

et al. 2019

Polymer Engineering & Sci

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Poly(meta‐phenylene isophtalamide) (PMIA) was processed via electrospinning to provide nanofibrous membranes with randomly and aligned fibers. Mechanical performance of such membranes was evaluated, applying a normalization procedure that takes into account the peculiar morphology of such complex substrate where voids can sum up to almost 80% of the sample volume. Random and aligned fibers membranes are applied onto wood panels to test their fire resistance in cone calorimetry when coated in polyaramidic thin nanofiber mats. Tests highlighted that random fibers provide a better fire protection, increasing Time to Ignition and decreasing the Fire Performance Index. Another important parameter affecting the performance is the adhesive system used to apply the nanofibers onto wood that is able to significantly modify the fire performance of the polyaramidic‐coated wood panels. POLYM. ENG. SCI., 59:2541–2549, 2019. © 2019 Society of Plastics Engineers

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“…Nanofibers are easy to be obtained via electrospinning technique and they offer a wide range of possible further modification: they can act as nonreinforcement 4 and they can in turn be nanomodified to provide additional structural and functional properties to the object on which they are applied 5 . Poly(meta-phenylene isophtalamide) -PMIA (NOMEX, DuPont) is an inherently flame resistant and selfextinguishing polymer and, when conveniently solubilized in the presence of inorganic salts, can be processed via electrospinning to provide nanofibrous membranes 6 . Only once PMIA fibers, in the form of fabric (155 g/m 2 each, four layers required), have been reported as flame shielding 7 .…”

Section: Introductionmentioning

confidence: 99%

Meta-aramidic electrospun nanofibers as innovative wood surface flame retardants

Merighi

Mazzocchetti

Benelli

et al. 2018

AIP Conference Proceedings

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An innovative approach to wood flame retardant modification has been proposed, using electrospun nanofibrous membrane to cover the wood surface and delay the fire ignition. Poly(meta-phenylene isophtalamide) (PMIA) has been used for nanofibrous membrane production and it has been applied onto wood panels via either vinyl glue or using a thin layer of polyurethane painting. Cone-calorimetric tests proved the ability of PMIA electrospun nanofibers to almost double the time to ignition of the wood panel. Tests carried out on the membranes still containing the LiCl salt required for the electrospinning process did not reach the same satisfying results of the washed PMIA membrane, where the inorganic component was completely removed. The fire testing measurements also pointed out the importance of a good adhesion between the coating membrane and the wood surface, demonstrating a better ability of the polyurethane paining as coupling agent. It is worth to point out the negligible impact of the applied polymeric nanofibrous shielding coating on both the overall weight of the sample (24-27 g/m 2 ) and thickness (50m overall thickness increase after application and rolling).

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Poly-m-aramid nanofiber mats: Production for application as structural modifiers in CFRP laminates

Cited by 6 publications

References 6 publications

Study on Mode I fatigue behaviour of Nylon 6,6 nanoreinforced CFRP laminates

Study on Mode I fatigue behaviour of Nylon 6,6 nanoreinforced CFRP laminates

A New Wood Surface Flame‐Retardant Based on Poly‐m‐Aramid Electrospun Nanofibers

Meta-aramidic electrospun nanofibers as innovative wood surface flame retardants

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