Interfacial effects on the dynamics of ethylene–propylene copolymer nanocomposite with inorganic clays

Prevosto, D.; Lucchesi, M.; Bertoldo, Monica; Passaglia, Elisa; Ciardelli, Francesco; Rolla, Pierangelo

doi:10.1016/j.jnoncrysol.2009.09.035

Cited by 20 publications

(18 citation statements)

References 35 publications

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“…The detailed analysis of isothermal dielectric spectra of EPMgDEM and its nanocomposite S5 have been presented in a previous publication, to which the interested reader can refer [46]. In the present paper some results of the previous analysis has been considered, together to new TMDSC measurements.…”

Section: Resultsmentioning

confidence: 95%

“…Such spectra are plotted by subtracting the contribution from the conductivity and the secondary relaxation, which have been estimated in the previous analyses showed in Ref. [46] for EPMgDEM and its nanocomposite, and in Ref. [44] for PETg and its nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the increase of N α in S5 nanocomposite can be explained in terms of favorable interactions between the platelets and the polymer chains [21,46]. In fact, because of such positive interactions the platelets are surrounded by a region of polymer chains that behaves as bound to the clay, where likely a larger cooperativity is present with respect to the pure polymer.…”

Section: Discussionmentioning

confidence: 99%

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Cooperativity length scale in nanocomposites: Interfacial and confinement effects

Saiter

Prevosto²,

Passaglia³

et al. 2013

Phys. Rev. E

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Interfacial and confinement effects on the evolution of cooperativity on approaching the glass transition have been studied in poly(propylenecoethylene) functionalized with diethylmaleate, polyethylene 1,4-cyclohexylenedimethylene terephthalate glycol and their nanocomposites with montmorillonite. A small increase of the structural dynamic cooperativity, a weak alteration of the temperature dependence of the characteristic relaxation frequency, and no changes in the glass transition temperature observed in poly(propylenecoethylene)-based samples can be rationalized in terms of interfacial interactions between polymer and exfoliated clay. On the other hand, confinement of polymer chains in the galleries of clay (intercalated nanocomposite) produces a strong reduction of cooperativity, of the temperature dependence of the characteristic relaxation frequency, and of the glass transition temperature in polyethylene 1,4-cyclohexylenedimethylene terephthalate glycol samples. Finally, by investigating the temperature dependence of a generalized fragility and of cooperativity, we evidenced that fragility of glass formers is determined not only by cooperativity.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Cooperativity length scale in nanocomposites: Interfacial and confinement effects

Saiter

Prevosto²,

Passaglia³

et al. 2013

Phys. Rev. E

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“…However, there are very few works that consider PNCs based on RPCs and o-MMT. [8][9][10][11][12][13][14] The preparation of the majority of the polyolefin-based PNCs is done by melt intercalation. The mixing in the molten state technique has great advantages over other methods such as in situ polymerization or polymer-solution intercalation since it is environmentally friendly and compatible with current industrial processes.…”

Section: Introductionmentioning

confidence: 99%

Effect of montmorillonite on the crystallization and thermal degradation of poly(propylene-co- ethylene-co-1-butene) nanocomposites

Riechert

Failla

Quinzani

2016

Journal of Thermoplastic Composite Materials

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Polymeric nanocomposites based on poly(propylene- co-ethylene- co-1-butene) (PEBC) were elaborated by melt mixing using an organophilic montmorillonite (o-MMT) and maleated PEBC (PEBCg) as compatibilizer. The effect of clay concentration, PEBCg:o-MMT ratio, and grafting degree of the compatibilizer were studied. X-ray diffraction and scanning electron microscopy show formation of partially intercalated structures in all compatibilized composites with well-distributed small tactoids. According to the differential scanning calorimetry results, the anhydride groups of the compatibilizer have a marginal nucleating effect, while the o-MMT causes a slight decrease in the crystallization temperature of the polymer. PEBC presents the largest activation energy of crystallization ( Eα), while the composites show lower Eα than their matrices. It is also observed that the rate of degradation of PEBC is not affected by the presence of PEBCg. The nanoclay, on the other hand, retards the decomposition process of the polymeric matrix in about 40°C and augments its rate of degradation approximately four times.

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“…Nanocomposites based on PP and o‐MMT are analyzed in many publications, and referenced works within. Several works also study nanocomposites based on RPC and o‐MMT, but only a few consider RPC with low comonomer content (<10 wt %) . These studies are based in composites having from 2 to 6 wt % of different o‐MMTs and 1:1 to 3:1 compatibilizer/o‐MMT ratios using maleated PP (PPg) and propylene copolymers.…”

Section: Introductionmentioning

confidence: 99%

Linear viscoelasticity, extensional viscosity, and oxygen permeability of nanocomposites based on propylene copolymer and organoclay

Riechert

Quinzani

Failla

2017

J of Applied Polymer Sci

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Random propylene-terpolymer (PEBC)/organophilic montmorillonite nanocomposites were prepared by melt mixing, using PEBC modified with maleic anhydride (PEBCg) as compatibilizer. Clay concentrations up to 8 wt %, compatibilizer/clay ratios up to 3:1 and concentrations of anhydride groups (AG) in PEBCg of 0.4 and 0.6 wt % were considered. The degree of exfoliation of the clay increases with PEBCg content and its concentration of AGs. The dynamic moduli allow estimating the percolation threshold of the nanofiller at 5.4 wt %, which yields an average of 11 silicate layers per tactoid at percolation, in agreement with the minimum thickness estimated from XRD data. The presence of exfoliated clay gives place to strain hardening and softening, depending on clay concentration and magnitude of the Hencky strain. The amount of exfoliated clay, however, plays a minor role in front of the content of AGs of the compatibilizer in regard with the oxygen permeability of the polymer.

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Interfacial effects on the dynamics of ethylene–propylene copolymer nanocomposite with inorganic clays

Cited by 20 publications

References 35 publications

Cooperativity length scale in nanocomposites: Interfacial and confinement effects

Cooperativity length scale in nanocomposites: Interfacial and confinement effects

Effect of montmorillonite on the crystallization and thermal degradation of poly(propylene-co- ethylene-co-1-butene) nanocomposites

Linear viscoelasticity, extensional viscosity, and oxygen permeability of nanocomposites based on propylene copolymer and organoclay

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