The Effects of Nanofillers on Composite Materials Mechanical Properties

Almasi, Adrian; Porumb, Anca; Podariu, Angela Codruţa; Todor, Liana; Tofan, Sergiu Alexandru; Popovici, Ramona Amina

doi:10.37358/rc.17.1.5417

Cited by 6 publications

(7 citation statements)

References 23 publications

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“…After adding the nanoclay beyond the optimum level, in this case at 10 wt%, the d-spacing of nanoclay tends to reduce, attributed to the overloading of nanoclay and thus a closer distance between the silicate plates. This phenomenon is often ascribed to the effect of reagglomeration of nanoclays [25,47,48]. As expected, the organo-nanoclay is, to some extent, compatible with the isoprene monomer.…”

Section: Resultsmentioning

confidence: 60%

“…In order to make nanofillers well-dispersed in a rubber matrix, the researchers in this field have paid close attention to many aspects of the particular composites. These include: studies concerning intrinsic properties of raw materials in the composites, e.g., the modifications of polymers [19,20], fillers [21,22], and processing aids [23,24]; novel syntheses of key materials for the composites [25,26,27]; and the optimizations of different processing techniques and conditions, e.g., melt [28,29] and solution [30,31] mixing, mixing time and temperature, mixing procedure, pre-dispersion methods, etc., [32,33]. This technology remains challenging since the properties of a composite depend strongly on the processing conditions as well as composition.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Modification of Polyisoprene by Organo-Nanoclay during Emulsion Polymerization for Reinforcing Natural Rubber Thin Films

et al. 2019

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Nanoclay-modified polyisoprene latexes were prepared and then used as a reinforcing component in natural rubber (NR) thin films. Starve-fed emulsion (SFE) polymerization gives a higher conversion than the batch emulsion (BE), while the gel and coagulation contents from both systems are comparable. This is attributed to the SFE that provides a smaller average polymer particle size which in turn results in a greater polymerization locus, promoting the reaction rate. The addition of organo-nanoclay during synthesizing polyisoprene significantly lessens the polymerization efficiency because the nanoclay has a potential to suppress nucleation process of the reaction. It also intervenes the stabilizing efficiency of the surfactant—SDS or sodium dodecyl sulfate, giving enlarged average sizes of the polymer particles suspended in the latexes. TEM images show that nanoclay particles are attached on and/or inserted in the polymer particles. XRD and thermal (differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA)) analyses were employed to assess the d-spacing of nanoclay structure in NR nanocomposite films, respectively. Based on the overall results, 5 wt% of nanoclay relative to the monomer content utilized to alter the polyisoprene during emulsion polymerization is an optimum amount since the silicate plates of nanoclay in the composite exhibit the largest d-spacing which maximizes the extent of immobilized polymer constituent, giving the highest mechanical properties to the films. The excessive amounts of nanoclay used, i.e., 7 and 10 wt% relative to the monomer content, reduce the reinforcing power because of the re-agglomeration effect.

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Section: Resultsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

In Situ Modification of Polyisoprene by Organo-Nanoclay during Emulsion Polymerization for Reinforcing Natural Rubber Thin Films

et al. 2019

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“…In the present study the composite resin having higher amounts of the fillers showed better mechanical results. Other studies also demonstrated this correlation [18]. A possible explanation for this condition might be due to the fact that smaller particles size are related to a higher filler content by volume and a better distribution of the filler.…”

Section: Resultsmentioning

confidence: 63%

Evaluation of Compressive Strength of Repaired Direct Composite Resin Restorations

Andrian¹,

Pancu²,

Topoliceanu³

et al. 2017

Rev. Chim.

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The aim of the study was to evaluate and to compare the compressive parameters of repaired composite restoration when using different types of composite resins and a universal bonding agent as an intermediate layer. Aged micro-filled hybrid and nano-filled hybrid composite resins were chosen to simulate old restoration. The same micro-filled hybrid composite resin was used as a repair material. A universal bonding agent applied in etch-and-rinse and self etch strategies was used as an intermediate layer in restoration repair. Non-aged composite resins were considered as control. Compressive strength and compressive modulus were determined by evaluating the samples in a universal testing machine. Lower values of the tested parameters were recorded after aging both types of composite resin when compared to control. Higher values of compressive strength were recorded when nano-filled hybrid composite resin was repaired when compared to micro-filled hybrid composite resin. The strategy of universal bonding agent application as an intermediate layer did not influenced the compressive properties of repaired restoration.

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“…The properties of composites are influenced by type and extent of filler and inorganic silane and correct distribution of nanoparticles in the organic phase. In vitro studies are necessary to evaluate the biocompatibility of all dental materials [29][30][31].…”

Section: Figurementioning

confidence: 99%

Synthesis and Comparative Characterization of Different Microparticles used as Biomaterials in Dentistry

Tofan¹,

Olteanu²,

Szuhanek³

et al. 2021

Mater. Plast.

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A biomaterial must be biologically compatible, mechanical, functional, corrosion resistant and easily adapt to clinical and laboratory technologies. Dental biomaterials are materials used to replace a part of a living system or to work closely with living tissue. Many scientific articles present different polymeric biocomposites with possible application in dentistry and this is a proof of the opportunity of a research in a field in full ascent and with great availability in the promotion of materials destined to �work under biological constraint� and which must also meet the functional requirements of a dental implant. The objectives of this research were to obtain and to comparatively evaluate different polymeric microparticles that can be used in dentistry. The samples based on poly(lactic-co-glycolic acid) and respectively polyurethane microparticles were characterized by pH and Zetasizer measurements, and in vitro cytotoxicity assays. The results indicate the obtaining of particles with a neutral pH, medium homogeneity, and with different tendencies to form agglomerations. Their low cytotoxicity, tested on the primary human gingival fibroblasts by MTT and LDH techniques, indicates that these microparticles are safe to be tested in further clinical evaluations.

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The Effects of Nanofillers on Composite Materials Mechanical Properties

Cited by 6 publications

References 23 publications

In Situ Modification of Polyisoprene by Organo-Nanoclay during Emulsion Polymerization for Reinforcing Natural Rubber Thin Films

In Situ Modification of Polyisoprene by Organo-Nanoclay during Emulsion Polymerization for Reinforcing Natural Rubber Thin Films

Evaluation of Compressive Strength of Repaired Direct Composite Resin Restorations

Synthesis and Comparative Characterization of Different Microparticles used as Biomaterials in Dentistry

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