Mechanical and rheological response of polypropylene/boehmite nanocomposites

Pedrazzoli, Diego; Tuba, Ferenc; Khumalo, VM; Pegoretti, Alessandro; Karger‐Kocsis, J.

doi:10.1177/0731684413505787

Cited by 16 publications

(12 citation statements)

References 49 publications

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“…This behavior arises from the agglomeration of these fillers, which initially makes them act as microparticles, but after reaching a particular concentration, they tend to form larger agglomerates that act as fracture points, causing the material's failure when subjected to mechanical stress. 10,27,28 Based on the results can be stipulated that the groups containing a lower concentrations of both clays (0.2%), will have, when applied to the tooth structure, the highest bond strength in the short and long term, once that these materials exhibit higher microtensile indicating a greater cohesive strength, which reflects in obtaining a bonding interface with less prone to breakage and detachment of the tooth surface. 29 Likewise, it can be noted that these groups had higher elastic modulus which indicates the increased rigidity of these adhesives systems.…”

Section: Discussionmentioning

confidence: 99%

The Use of Montmorillonite Clays as Reinforcing Fillers for Dental Adhesives

Menezes

Silva

2016

Mat. Res.

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The aim of this study was to obtaining an adhesive made of dimethacrylate copolymer and clay particles in different concentrations. The samples were prepared by light curing and were evaluated by XRD, FTIR and TGA as well as by measuring flexural strength, elasticity modulus and tensile resistance. The XRD and the mechanical test results indicated that the system with 0.2% clay is exfoliated, while the highest concentrations showed the agglomeration of these clays. FTIR was used to determine the conversion, and showed that use of clays particles are unable to significantly alter the polymerization until 1.0%. However, for the group containing 1.5%, there was a decline in this index. In the thermogravimetric analysis, only the groups with 0.2% of clays showed increased thermal resistance. In conclusion, the incorporation of clay at 0.2% concentration produces a well-dispersed system and can be applied as a dental adhesive.

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Section: Discussionmentioning

confidence: 99%

The Use of Montmorillonite Clays as Reinforcing Fillers for Dental Adhesives

Menezes

Silva

2016

Mat. Res.

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“…It seems that, the sulphonic acid surface treatment of BA promotes a greater interaction between matrix and particles. As a result, the BA nanoparticles do not participate in massive debonding followed by fibrillation which inhibits the macroscopic elongation of the corresponding nanocomposite [33].…”

Section: Tensile Mechanical Behaviormentioning

confidence: 99%

“…Ogunniran studied the effect of the incorporation of BA in PP/PA 12 blends, finding that the degree of compatibility of the two polymers increased at high nanoparticle loading and BA significantly improved the thermal and mechanical properties [18,32]. In a previous work of our group the influence of BA content and surface treatment was investigated with respect to the morphology, crystallization behavior and mechanical properties of PP copolymer nanocomposites [33]. Specifically, the effects of untreated and surface modified (with octylsilane and sulphonic acid compound, respectively) BA nanoparticles with a crystallite size of around 80 μm on the thermo-mechanical properties were investigated.…”

Section: Introductionmentioning

confidence: 99%

Thermal, viscoelastic and mechanical behavior of polypropylene with synthetic boehmite alumina nanoparticles

Pedrazzoli¹,

Khumalo²,

Karger‐Kocsis³

et al. 2014

Polymer Testing

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Effects of nanofiller concentration and surface treatments on the morphology, thermal, viscoelastic and mechanical behaviors of polypropylene copolymer (PP)/boehmite alumina (BA) nanocomposites were investigated. Both untreated and treated BA particles with octylsilane (OS) and with sulphonic acid compound (OS2) were added up to 10 wt% to produce nanocomposites by melt mixing followed by film blow molding and hot pressing. Dispersion of BA was studied by scanning electron microscopy. Differential scanning calorimetry and wide-angle X-ray scattering were adopted to detect changes in the crystalline structure of PP. Thermooxidative degradation of the nanocomposites was assessed by thermogravimetrical analysis. Dynamic mechanical analysis served for studying the viscoelastic, whereas quasi-static tensile, creep and Elmendorf tear tests were used to detect changes in the mechanical performance. BA nanoparticles were finely dispersed in PP up to 10 wt%, even when they were not surface modified. The resistance to thermal degradation was markedly improved by BA nanomodification. Changes observed in the mechanical properties were attributed to BA dispersion, filler/matrix interactions and related effects because the crystalline characteristics of the PP matrix practically did not change with BA modification.

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“…Among the possible nanocomposite filler materials, aluminum oxide—or more specifically, boehmite (AlO(OH))—has the highest hydroxyl group content, allowing the material to react readily with silane coupling agents [ 24 ]. A limited number of works have been reported on the surface modification of boehmite for the purpose of promoting compatibility with polymers, such as polyethylene [ 25 , 26 , 27 , 28 , 29 ], polypropylene [ 30 ], and polyamide [ 31 ]. These works involve the use of silanes to modify the surface of boehmite to create a boehmite/polyethylene composite by melt extrusion that exhibits enhanced physical properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of Electron Beam Irradiation on Mechanical and Thermal Shrinkage Properties of Boehmite/HDPE Nanocomposite Film

et al. 2021

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Nanocomposites comprising high-density polyethylene (HDPE) and boehmite (BA) nanoparticles were prepared by melt blending and subsequently irradiated with electrons. Electron irradiation of HDPE causes crosslinking and, in the presence of BA, generates ketone functional groups. The functional groups can then form hydrogen bonds with the hydroxyl groups on the surface of the BA. Additionally, if the BA is surface modified by vinyltrimethoxysilane (vBA), it can covalently bond with the HDPE by irradiation-induced radical grafting. The strong covalent bonds generated by electron beam irradiation allow the desirable properties of the nanofiller to be transferred to the rest of the nanocomposite. Since EB irradiation produces a great number of strong covalent bonds between vBA nanoparticles and HDPE, the modulus of elasticity, yield strength, and resistance to thermal shrinkage are enhanced by electron irradiation.

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Mechanical and rheological response of polypropylene/boehmite nanocomposites

Cited by 16 publications

References 49 publications

The Use of Montmorillonite Clays as Reinforcing Fillers for Dental Adhesives

The Use of Montmorillonite Clays as Reinforcing Fillers for Dental Adhesives

Thermal, viscoelastic and mechanical behavior of polypropylene with synthetic boehmite alumina nanoparticles

Effects of Electron Beam Irradiation on Mechanical and Thermal Shrinkage Properties of Boehmite/HDPE Nanocomposite Film

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