Structural and optical properties of polypropylene–montmorillonite nanocomposites

Paiva, Lucilene Betega de; Morales, Ana Rita; Guimarães, Thiago R.

doi:10.1016/j.msea.2006.10.066

Cited by 37 publications

(22 citation statements)

References 9 publications

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“…No agglomerate particles of clay were observed. The translucency and brown coloration were also observed in our previous work (Paiva, 2007), for nanocomposites with the same matrix and compatibilizing agent and the commercial organophilic clay Cloisite® 20A. …”

Section: Resultssupporting

confidence: 82%

“…If the organophilic clay and the polymer are compatible, the polymer chains can migrate to the interlayer space of the clay to form a nanocomposite. The different levels of dispersion of the organophilic clay in the polymeric matrix can result in three structures: micro-composites in which the clay is not nano-dispersed; intercalated structures, in which single or more polymer chains are intercalated between the clay layers, resulting in an ordered multilayer structure of alternating polymeric and inorganic layers; and an exfoliated structure in which the clay layers are completely and uniformly dispersed in the continuous polymer matrix (Paiva et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Organophilic bentonites based on Argentinean and Brazilian bentonites: part 2: potential evaluation to obtain nanocomposites

Paiva

Morales

Branciforti

et al. 2012

Braz. J. Chem. Eng.

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-This work describes the preparation of composites of polypropylene and organophilic bentonites based on Brazilian and Argentinean bentonites. During the processing of the samples in a twin screw microextruder, torque and pressures of the extruder were accompanied and the viscosity values were calculated. No significant changes in the torque, pressure and viscosity were found for composites prepared with different bentonites. The samples were characterized by XRD and TEM to evaluate the structure and dispersion of the organophilic bentonites. Composites with exfoliated, partially exfoliated and intercalated structures were obtained and correlations between the intrinsic properties of the sodium clays and organophilic bentonites and their influence on the composites were studied. The cation exchange capacity of the sodium bentonites and the swelling capacity of the organophilic bentonites were the most important properties to obtain exfoliated structures in composites. All bentonites showed the potential to obtain polymer nanocomposites, but the ones from Argentina displayed the best results.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Organophilic bentonites based on Argentinean and Brazilian bentonites: part 2: potential evaluation to obtain nanocomposites

Paiva

Morales

Branciforti

et al. 2012

Braz. J. Chem. Eng.

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show abstract

“…It is reasonable to consider that intercalated structure was formed for this sample also. The results of XRD, related to the clay d-spacing were discussed in more details in previous work [25] .…”

Section: Resultsmentioning

confidence: 99%

Morphology, structure and mechanical properties of polypropylene modified with organophilic montmorillonite

et al. 2012

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Abstract:The aim of this work is to study the properties of systems based on polypropylene (PP) and commercial organophilic montmorillonite, prepared by melt intercalation. Because of the non polar character of PP, the polypropylene-graft-maleic anhydride (PP-g-MA) was used as compatibilizer. Materials containing 2.5, 5, 7.5 and 10% of clay and PP, and two extra compositions containing only PP and 15 and 30% of PP-g-MA were processed using a twin-screw extruder. The level of clay dispersion was characterized by X ray diffraction, showing exfoliated/intercalated structures for different concentrations of clay. The crystallization behavior was studied by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) with hot stage. Tensile properties were also studied and presented a moderate improvement with increase in clay concentration.

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“…The application of PP in various industrial sectors can be further expanded once its mechanical performances have been highly upgraded. Therefore, PP has been a popular matrix used in association with all kinds of nanofillers such as carbon nanotubes (CNTs) [8][9][10][11][12], layered silicates (clays such as montmorillonite (MMT) etc.,) [13][14][15] and nanoparticles such as silica, graphite and calcium carbonate [16][17][18][19], even though the nanofiller dispersion is challenging in that case and often remains an issue. Halloysite nanotubes (HNTs) have recently become the subject of research attention as a new type of additive for enhancing the mechanical, thermal and fire-retardant performance of polymers [20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Processing and characterization of halloysite nanotubes filled polypropylene nanocomposites based on a masterbatch route: effect of halloysites treatment on structural and mechanical properties

Prashantha¹,

Lacrampe²,

Krawczak³

2011

Express Polym. Lett.

187

126

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Abstract. Halloysites/polypropylene nanocomposites with different nanotubes contents were prepared by diluting a masterbatch containing 30 wt.% halloysites with polypropylene (PP). Unmodified (HNTs) and quaternary ammonium salt treated (QM-HNTs) halloysite nanotubes were used. Both degree of crystallinity and crystallization temperature increase upon addition of halloysites into PP, thus indicating a potential nucleation effect induced by the nanotubes. An homogeneous distribution and dispersion of nanotubes was observed throughout the PP matrix, with a slightly better dispersion in the case of modified QM-HNTs compared to unmodified HNTs. Mechanical tests in tension, bending and notched impact demonstrated that strength and modulus of the nanocomposites significantly increase with addition of halloysites without significant loss of ductility. An halloysite content of 6 wt.% appears as an optimum. Modified halloysites (QM-HNTs) lead to globally better performances due to strong interfacial interaction between the polymer matrix and the nanotubes.

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Structural and optical properties of polypropylene–montmorillonite nanocomposites

Cited by 37 publications

References 9 publications

Organophilic bentonites based on Argentinean and Brazilian bentonites: part 2: potential evaluation to obtain nanocomposites

Organophilic bentonites based on Argentinean and Brazilian bentonites: part 2: potential evaluation to obtain nanocomposites

Morphology, structure and mechanical properties of polypropylene modified with organophilic montmorillonite

Processing and characterization of halloysite nanotubes filled polypropylene nanocomposites based on a masterbatch route: effect of halloysites treatment on structural and mechanical properties

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