Ionic liquid tailored interfaces in halloysite nanotube/heterophasic ethylene–propylene copolymer nanocomposites with enhanced mechanical properties

Bischoff, Eveline; Simon, Douglas Alexandre; Schrekker, Henri Stephan; Lavorgna, Marino; Ambrosio, Luigi; Liberman, Susana Alcira; Mauler, Raquel Santos

doi:10.1016/j.eurpolymj.2016.07.003

Cited by 17 publications

(6 citation statements)

References 50 publications

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“…Due to a high specific surface area and unique surface chemical properties, HNTs are widely used to improve a polymer's property. In the meanwhile, the low surface charge and weak interfacial interaction could be problematic [33]. Surface modified HNTs not only demand well dispersed and strong interfacial interactions [34], but also to provide abundant bond formation [35].…”

Section: As the Filler Nanocompositesmentioning

confidence: 99%

Recent Advances on Surface Modification of Halloysite Nanotubes for Multifunctional Applications

et al. 2017

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Halloysite nanotubes (HNTs) are natural occurring mineral clay nanotubes that have excellent application potential in different fields. However, HNTs are heterogeneous in size, surface charge, and formation of surfacial hydrogen bond, which lead to weak affinity and aggregation at a certain extent. It is very important to modify the HNTs' surface to expand its applications. In this review, the structural characteristics, performance, and the related applications of surface-modified HNTs are reviewed. We focus on the surface-modified variation of HNTs, the effects of surface modification on the materials and related applications in various regions. In addition, future prospects and the meaning of surface modification were also discussed in HNTs studies. This review provides a reference for the application of HNTs modifications in the field of new nanomaterials.

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Section: As the Filler Nanocompositesmentioning

confidence: 99%

Recent Advances on Surface Modification of Halloysite Nanotubes for Multifunctional Applications

et al. 2017

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“…To overcome this issue, future studies could analyze the possibility of functionalizing the particles of LiNbO 3 with an organic compound. This method can improve the dispersion of the fillers in polymers [33,34] and keep the particles non-agglomerated [24], which may improve composites' physical properties.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Physicochemical and Antibacterial Properties of Experimental Adhesives Doped with Lithium Niobate

et al. 2020

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The aim of the present study was to formulate dental adhesives with different concentrations of LiNbO3 and to evaluate their physicochemical and antibacterial properties. A dental adhesive was formulated using methacrylate monomers and photoinitiators and used as a control filler-free group. Subsequently, three experimental adhesives doped with LiNbO3 at different concentrations (1 wt.%, 2 wt.%, and 5 wt.%) were also formulated. All the experimental adhesives were assessed to evaluate the degree of conversion (DC), softening in solvent, immediate and long-term microtensile bond-strength (μ-TBS), radiopacity, ultimate tensile strength, and antibacterial activity. The incorporation of 1 wt.% of LiNbO3 had no negative effect on the DC of the adhesive resin compared to the control group (p > 0.05). We observed a decrease in the percentage of softening in solvent in the group LiNbO3 at 1 wt.% (p < 0.05). The addition of LiNbO3 increased the radiopacity at a concentration above 2 wt.%, and there was also an increase in cohesive strength (p < 0.05). The immediate μ-TBS increased for LiNbO3 at 5 wt.% (p < 0.05), and there was no statistical difference for the other groups compared to the control (p > 0.05). After six months, the group with 5 wt.% still presented the highest μ-TBS (p < 0.05). The adhesives showed no antimicrobial activity (p > 0.05). LiNbO3 was successfully incorporated in dental adhesives, increasing the radiopacity and their resistance to degradation. Although LiNbO3 offered no antibacterial properties, the reliability of LiNbO3 incorporation in the adhesive encourages new tests to better investigate the antimicrobial action of LiNbO3 through temperature variation.

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“…For non-covalent modifications, strong physical interactions with HNT surface are needed and molecules which can form physical bonds with surface functions like hydroxyls are generally acceptable. Various chemical products are also reported for these procedures which are aided by chelating ligands [99,100], ionic liquids [101], carbohydrates [102] or surfactants [103,104].…”

Section: Different Routes Of Modification Of Hntsmentioning

confidence: 99%

Halloysite nanotubes (HNTs)/polymer nanocomposites: thermal degradation and flame retardancy

et al. 2020

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Clays are inexpensive minerals having outstanding features for engineering applications. Nanosize clays with different shapes and sizes have been widely used in academia and polymer industry alike, so that different angles about the effects of incorporation of nanoclays into polymers have been discussed. Halloysite nanotubes (HNTs) are a class of this family of mineral with outstanding physical properties thanks to the presence of reactive sites in the inner and outer surfaces of nanotubes. Evaluation of thermal behavior and flame retardancy of HNTs, alone or when added as a nanoparticle to a polymer, has been the subject of several reports.Nevertheless, hydrophilic nature of HNTs and their incompatibility with nonpolar polymer matrices was highlighted as an obstacle against proper dispersion of platy and tubular nano-size clays, two main geometrical shapes of nanoclays. This chapter summarizes research done on thermal behavior of clays, particularly HNTs, their chemical affinity as well as thermal and flame properties of their corresponding nanocomposites. The impact of pristine and modified halloysite clays, alone or in combination with other types of additives, on thermal stability and flame retardancy of polymer systems were overviewed in brief.

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Ionic liquid tailored interfaces in halloysite nanotube/heterophasic ethylene–propylene copolymer nanocomposites with enhanced mechanical properties

Cited by 17 publications

References 50 publications

Recent Advances on Surface Modification of Halloysite Nanotubes for Multifunctional Applications

Recent Advances on Surface Modification of Halloysite Nanotubes for Multifunctional Applications

Evaluation of the Physicochemical and Antibacterial Properties of Experimental Adhesives Doped with Lithium Niobate

Halloysite nanotubes (HNTs)/polymer nanocomposites: thermal degradation and flame retardancy

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