UV-cured transparent magnetic polymer nanocomposites

Nardi, Tommaso; Sangermano, Marco; Leterrier, Y.; Allia, Paolo; Tiberto, P.

doi:10.1016/j.polymer.2013.06.052

Cited by 34 publications

(34 citation statements)

References 27 publications

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“…S1). Similarly to our observations, complex MNP structure has been reported previously in photopolymer matrix and other polymer solutions and melts . Robbes et al have proposed that aggregation of MNPs in a liquid polymer matrix undergoes a two‐step aggregation process.…”

Section: Resultssupporting

confidence: 91%

Translation of segment scale stiffening into macroscale reinforcement in polymer nanocomposites

Zbončák

Ondreáš

Uhlíř

et al. 2019

Polymer Engineering & Sci

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Structuring of polymer nanocomposites (PNCs) with an aid of relatively weak external magnetic fields has been studied as a method for control of the nano‐ and microstructure. Magnetic nanoparticles (NPs) were assembled into high aspect ratio one‐dimensional strings and unidirectionally oriented with the magnetic field (B = 0–50 mT) within the photopolymer matrix. The effect of the anisotropic MNPs assemblies on the mechanical properties was studied over a wide temperature range for the first time. The impact of various reinforcing mechanisms was distinguished with respect to the position of the glass transition temperature (Tg). The reinforcing effect exhibits temperature dependency with a maximum ~65°C above the glass transition and only negligible effect below the Tg. In addition, significant directional anisotropy of stiffness was observed. Composite micromechanics was applied to interpret the orientation and size‐dependent reinforcement of PNCs, and temperature‐dependent stiffness of the polymer‐MNP structures was quantified. The presence of polymer chains with altered dynamics surrounding the MNPs inside the anisotropic assemblies was proposed to be an essential nanoscale mechanism mediating the stress transfer and contributing to mechanical robustness of the hybrid structures and PNCs. POLYM. ENG. SCI., 60:587–596, 2020. © 2019 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 91%

Translation of segment scale stiffening into macroscale reinforcement in polymer nanocomposites

Zbončák

Ondreáš

Uhlíř

et al. 2019

Polymer Engineering & Sci

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“…Magnetic materials consisting of iron oxide particles (typically magnetite and maghemite) dispersed in and/or stabilized by a polymer matrix, have received great attention as a new generation of magnetic stimuli-responsive materials that combine the advantages of both components [1][2]. Such smart inorganic/organic system has been proven to be applicable in many fields, in particular in drug delivery, separation and/or purification of chemicals, development of shape-memory materials and in catalysis [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

One-step synthesis of magnetic chitosan polymer composite films

Cesano

Fenoglio

Carlos

et al. 2015

Applied Surface Science

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“…The synthetic procedures for Fe 3 O 4 nanoparticles and 3-methacryloyloxypropyl trimethoxysilane (MPS) functionalized Fe 3 O 4 @SiO 2 core-shell nanoparticles as well as the preparation and photopolymerization of the nanocomposites have been reported in previous publications [8,9]. Nanoindentation measurements were performed on the transverse cross-sectioned samples using a Nano Indenter XPTM (MTS Nano Instruments) with a three-sided diamond Berkovich indenter.…”

Section: Methodsmentioning

confidence: 99%

Bioinspired Functionally Graded Nanocomposites Synthesized Through Magnetophoretic Processes for Tailored Stress Reduction

Nardi

Leterrier

2014

MRS Proc.

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Through a unique combination of magnetophoretic and photopolymerization processes, approximately 150 µm thick functionally graded films based on a UV-curable matrix and containing Fe 3 O 4 @SiO 2 core-shell nanoparticles are synthesized. Owing to their continuous composition gradients and to the considerable variations in elastic modulus (up to ≈70 %) when going from particle-depleted to particle-enriched regions, such materials are highly efficient in reducing the mechanical stress arising from thermal variations, therefore improving the material efficiency towards durability and delamination problems. INTRODUCTION It is well known how many bio-composites such as bamboo [1-3], tissue interfaces [4]and teeth [5] are able to increase their mechanical performances and minimize stresses arising from environmental loads through a hierarchical organization of their constitutive elements. Not only functionally graded materials (FGM) can efficiently reduce the detrimental effects associated to external mechanical loads, but they can also minimize stresses arising from thermal mismatches between the graded coating and the substrate when these are subjected to temperature ramps. [6,7] In this study, we first propose a synthetic strategy for functionally graded materials based on the application of a magnetic field gradient on polymeric composite coatings filled with surface functionalized Fe 3 O 4 @SiO 2 nanoparticles. We show how starting from a homogeneous dispersion of nanoparticles in the uncured polymeric matrix, coatings exhibiting tailored gradients in particles concentration and corresponding gradients in elastic moduli can be synthesized. We then compute the thermal stresses within the coating and at the coating-substrate interface for various graded morphologies (Figure 1). We demonstrate how such graded structures improve thermal stress distribution compared to the homogeneous case, efficiently reducing the micromechanical stresses deriving by temperature treatments, both at the manufacturing stage and during lifetime.

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UV-cured transparent magnetic polymer nanocomposites

Cited by 34 publications

References 27 publications

Translation of segment scale stiffening into macroscale reinforcement in polymer nanocomposites

Translation of segment scale stiffening into macroscale reinforcement in polymer nanocomposites

One-step synthesis of magnetic chitosan polymer composite films

Bioinspired Functionally Graded Nanocomposites Synthesized Through Magnetophoretic Processes for Tailored Stress Reduction

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