Quantitative estimation of the reinforcing effect of layered silicates in PP nanocomposites

Százdi, László; Pukánszky, Béla; Vancso, Gyula J.

doi:10.1016/j.polymer.2006.04.053

Cited by 80 publications

(60 citation statements)

References 69 publications

(121 reference statements)

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“…The latter implies a new definition of the matrix stiffness with a significant shift toward the left side of Figure 7 in the experimental data for samples based on copolymers with high short chain branching content (E p /E m is reduced), improving the match with the models. This analysis is supported by the conclusion of Pukanszky and coworkers [69] studying several poly(propylene)/clay nanocomposites and comparing the results with those coming from a mathematical model (based on a different approach compared with the models presented here) applied to these systems. It was reported that because of the different properties of the functionalized polymer (compatibilizer) relative to the matrix, the poly(propylene)/compatibilizer blend serves as a matrix for the clay.…”

Section: Mechanical Propertiessupporting

confidence: 75%

“…It was reported that because of the different properties of the functionalized polymer (compatibilizer) relative to the matrix, the poly(propylene)/compatibilizer blend serves as a matrix for the clay. [69] Therefore, the synergistic effect of the clay and the compatibilizer is responsible of the dramatic changes in the mechanical properties of composites based on matrices of high amount of short chain branching. This phenomenon is not currently considered in mathematical models, as observed in Equation (3) and (4), being especially relevant in TPO nanocomposites.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Effect of Comonomer Content on the Behavior of Propylene Copolymer/Compatibilizer/Clay Nanocomposites

Palza

2010

Macro Materials & Eng

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A set of isotactic propylene copolymers with either 1‐hexene or 1‐octadecene were synthesized using a metallocene catalyst, and their nanocomposites with 5 wt.‐% of clay and 15 wt.‐% of compatibilizer were prepared and characterized. Clay intercalation and dispertion depend on the comonomer content in the matrix which improves at high short‐chain‐branching levels. The presence of both clay and compatibilizer increased the crystallization temperature of the matrix. A strong correlation between the elastic modulus of the matrix and its relative increase in the nanocomposite was observed. By adding clay and compatibilizer to the copolymer, the modulus can be increased by a factor of two. The results open new perspectives in the understanding of the effect of polyolefin topology on nanocomposites properties.

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Section: Mechanical Propertiessupporting

confidence: 75%

Section: Mechanical Propertiesmentioning

confidence: 99%

Effect of Comonomer Content on the Behavior of Propylene Copolymer/Compatibilizer/Clay Nanocomposites

Palza

2010

Macro Materials & Eng

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“…To elucidate the detailed role on the compatibilizer effect in assisting the clay dispersion to the mechanical properties of nanocomposites, Szazdi et al [16] pointed out that a high exfoliation extent may not guarantee high strength for layered silicate nanocomposites as demonstrated by PP/clay nanocomposites using polypropylene (PP)-g-maleic anhydride (MA) as a compatibilizer. Their proposed model for yield strength was evaluated using a survey of about forty PP/clay nanocomposite systems, suggesting the significance of the compatibilized inter-phase between the matrix and clay.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of chitosan/clay (nano)composites: a silanol quaternary ammonium intercalated clay

Chiu¹,

Lai²,

Hsieh³

et al. 2012

J Polym Res

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Chitosan/clay (nano)composites were prepared by using a special quaternary ammonium intercalating agent coupled with a silanol group to facilitate the organic clay formation. Exfoliated clay in the chitosan matrix was attained at the higher intercalant dosages through X-ray diffraction (XRD) and transmission electron microscope (TEM) analyses. Optical transmittance for the (nano)composites increased slightly with increasing the amount of intercalants in the clays. In light of the hydrophobic component on the intercalant and the effective clay content, the interfacial interaction between chitosan and modified clay may not be strong enough to render higher mechanical properties, even though the partially exfoliated clays were achieved to provide high interfacial area for the dispersed phase and the matrix. An optimum Young's modulus was thus found for (nano)composites using modified clay at a medium dosage of intercalant, which resulted from the balance of the dispersion status and interfacial interaction. This outcome indicated high dispersion of modified clay may not guarantee high mechanical properties of (nano)composites. The antimicrobial property of chitosan against Escherichia coli (E. coli) increased further with the addition of modified clays, in which the intercalant exhibiting the antimicrobial function. The modified clay at an optimum dosage of modifier to balance the mechanical properties and antimicrobial property was attained.

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“…The success of Bourbigot et al in achieving high levels of dispersion is a consequence of the relatively high polarity of the PA6 polymer which in the molten state behaves like a polyelectrolyte. No such advantage is observed with polypropylene and others have reported on the challenges that this polymer poses [14].…”

Section: Introductionmentioning

confidence: 94%

Polypropylene fibers containing dispersed clays having improved fire performance. Part II: characterization of fibers and fabrics from PP–nanoclay blends

Smart

Kandola

Horrocks

et al. 2008

Polymers for Advanced Techs

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In this second part of a series of studies on polypropylene (PP) fibres having improved fire performance and containing nanodispersed clays we build on the observations of the first part of this work (published in Journal of Applied Polymer Science), where the need to improve dispersion of nanoclays is the key to achieve significant improvement. This paper attempts to address this issue by reporting studies of the use of several different functionalised clays in the presence and absence of compatibilising PP copolymers and also to which the flame retardant, ammonium polyphosphate has been introduced.Compounded polymer samples have been characterised using XRD, optical and scanning electron microscopies and their melt flow indices (MFI). These compounded polymers have been successfully extruded into filaments using a single screw extruder and then knitted into fabric samples. Filament physical properties are reported together with burning behaviours of fabric samples using limiting oxygen index (LOI) and flame spread tests.

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Quantitative estimation of the reinforcing effect of layered silicates in PP nanocomposites

Cited by 80 publications

References 69 publications

Effect of Comonomer Content on the Behavior of Propylene Copolymer/Compatibilizer/Clay Nanocomposites

Effect of Comonomer Content on the Behavior of Propylene Copolymer/Compatibilizer/Clay Nanocomposites

Preparation and properties of chitosan/clay (nano)composites: a silanol quaternary ammonium intercalated clay

Polypropylene fibers containing dispersed clays having improved fire performance. Part II: characterization of fibers and fabrics from PP–nanoclay blends

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