Comparative analysis of nanocomposites based on polypropylene and different montmorillonites

Rohlmann, Cora Otilia; Horst, María Fernanda; Quinzani, Lidia M.; Failla, Marcelo Daniel

doi:10.1016/j.eurpolymj.2008.07.006

Cited by 76 publications

(78 citation statements)

References 32 publications

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“…This result reveals that a significant fraction of the organic modification will be eliminated during the compounding of the composite. The TG and TGD curves reported in this work are very similar to those reported in the literature for commercial [23] and newly developed [5,7,9,10,24] organic montmorillonites. Fig.…”

Section: Thermal Analysissupporting

confidence: 85%

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Study of the effects of the reaction conditions on the modification of clays with polyelectrolytes and silanes

Orden

Muñoz

Lorenzo

et al. 2010

Journal of Colloid and Interface Science

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Section: Thermal Analysissupporting

confidence: 85%

“…The most characteristic weight loss, which starts near 600°C and shows the maximum at 670°C, has been assigned to the dehydroxylation of the aluminosilicate structure [5,20,[23][24][25].…”

Section: Thermal Analysismentioning

confidence: 99%

Study of the effects of the reaction conditions on the modification of clays with polyelectrolytes and silanes

Orden

Muñoz

Lorenzo

et al. 2010

Journal of Colloid and Interface Science

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“…This contraction could be attributed to a rearrangement of alkyl chains of the clay modifier during the preparation of nanocomposites. 22,23 Duquesne, 19 found a decrease in clay interlayer spacing of Cloisite 30B and Cloisite Na þ after blending with ethylene vinyl acetate. In spite of this, XRD measurements revealed that the C15A was better dispersed in the polymeric matrix than the CNa þ because of its higher distance between the clay layers.…”

Section: Resultsmentioning

confidence: 99%

Relationship between thermal properties, morphology, and crystallinity of nanocomposites based on polyhydroxybutyrate

D'amico

Manfredi

Cyras

2011

J of Applied Polymer Sci

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Polyhydroxybutyrate (PHB) has a significant instability at temperature close to the melting point. The aim of this work was to improve the thermal resistance of PHB by the addition of small amounts of two different types of clays: Cloisite. C15A has more hydrophobic character and interlayer distance than CNa þ . It was observed that the addition of the organically modified montmorillonite (MMT) increased by more than 15 C the thermal resistance of the PHB while the addition of CNa þ reduced it. This result was related to the different morphology of the final materials. The maximum in the degradation temperature of the nanocomposites with 4% of clay was in accordance with the maximum in the percentage of crystallinity. However, the interlayer gallery distance of the C15A was higher than the CNa þ in the PHB matrix, according to the better thermal stability of the C15A due to the higher barrier effect and the lower chain mobility. A slight increase in the Young modulus of the polymer was observed with the addition of C15A, due to the compatibility between the MMT and PHB. The calorimetric and microscopy results showed that clays did not accelerate the formation of PHB spherulites nucleus, but the lamellar velocity was accelerated.

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“…compared to pure polymers or micro-and macroconventional composites [8][9][10]. To promote the compatibility between the clay and polymer, it is often required to exchange the inorganic clay cations with organic cations, usually with quaternary ammonium compounds [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Development of antimicrobial PCL/nanoclay nanocomposite films with enhanced mechanical and water vapor barrier properties for packaging applications

et al. 2014

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Biodegradable PCL-based nanocomposites were successfully prepared by melt mixing of the poly(e-caprolactone) with two organo-modified Algerian montmorillonites by the cation exchange reactions with two quaternary ammonium surfactants, namely hexadecyl trimethyl ammonium chloride (OMMT1) and hexadecyl pyridinium chloride (OMMT2), with the aim to elaborate antimicrobial PCL/nanoclay composite films with enhanced properties for food packaging applications. PCL-based nanocomposite films containing either OMMT1 or OMMT2 organoclays have displayed mainly intercalated structures as attested by X-ray diffraction patterns and transmission electron microscope images. Glass transition (T g ) and melting (T m ) temperatures of these materials, evaluated by differential scanning calorimetry analysis, were remained almost unchanged. In addition, their thermal stabilities, observed by thermogravimetric analysis, were slightly decreased as compared to the neat PCL matrix. The antibacterial performance of PCL/OMMT1 and PCL/OMMT2 composite films against Staphylococcus aureus (Gram-positive) and Escherichia coli (Gramnegative) was assessed by counting the number of bacteria in the sample. A significant decrease in the number of bacteria is noticed after the addition of 3 wt% of OMMT to the matrix, where a maximum of 94 % of growth inhibition can be reached. Furthermore, these PCL/OMMT nanocomposites have showed an interesting improvement in their several properties that are strategically studied in packaging applications. The Young modulus has increased by 36 and 22 % for (PCL/OMMT1) and (PCL/OMMT2), respectively. Also, the water vapor permeability has decreased by 56 % for (PCL/OMMT1) and 48 % for (PCL/OMMT2).

show abstract

Comparative analysis of nanocomposites based on polypropylene and different montmorillonites

Cited by 76 publications

References 32 publications

Study of the effects of the reaction conditions on the modification of clays with polyelectrolytes and silanes

Study of the effects of the reaction conditions on the modification of clays with polyelectrolytes and silanes

Relationship between thermal properties, morphology, and crystallinity of nanocomposites based on polyhydroxybutyrate

Development of antimicrobial PCL/nanoclay nanocomposite films with enhanced mechanical and water vapor barrier properties for packaging applications

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