Efeitos de diferentes argilas organofílicas nas propriedades de compósitos PET/Bentonita

Leite, Itamara Farias; Raposo, Claudia M. O.; Carvalho, Laura H.; Silva, Suédina Maria de Lima

doi:10.1590/s1517-70762006000300014

Cited by 4 publications

(6 citation statements)

References 20 publications

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“…21 The interaction mechanism of alkylammonium ions with contaminant ions in an aqueous medium is not addressed. However, several works mention the ability to increase interplanar spacing in MMT by alkylammonium ions from the inner layers 20,[22][23][24] over the smaller interplanar sodium ion of sodium Cloisite. Possibly, although C20A is more hydrophobic than the unmodified MMT clay, 25 a larger interplanar spacing may favor water entry between lamellae and ion exchange between alkylammonium ions connected by Si O bonds.…”

Section: Introductionmentioning

confidence: 99%

Two different routes to prepare porous biodegradable composite membranes containing nanoclay

Zanini,

Ferreira,

Barbosa

et al. 2023

J of Applied Polymer Sci

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The method employed for membrane preparation and nanoparticle incorporation in membrane systems can affect their properties. This work aims to compare the better strategy to obtain membranes from the preparation of PBAT [Poly(butylene adipate co‐terephthalate)] containing nanoclay Cloisite® 20A (C20A) (0, 0.5, and 1 wt.%) by combined Evaporation/Non‐solvent Induced Phase Separation (EIPS/NIPS) or dip coating methods. The SEM, TGA, contact angle measurements, FTIR, XRD, mechanical testing, and cost analysis characterized EIPS/NIPS to dip coating membranes. EIPS/NIPS membranes had smaller pores (0.3–0.5 μm), with a more homogeneous pore diameter distribution due to C20A nanoclay insertion. PBAT/0.5% C20AEIPS/NIPS was the more hydrophilic membrane (37°) with better mechanical properties proven by statistical analysis. The cost analysis showed that EIPS/NIPS membranes production cost per square meter (m2) was lower (US$ 73.4–73.8) than dip coating (US$ 89.0–99.2). The EIPS/NIPS method was the most economically and statistically advantageous, and its properties can favor future applications for PTEs removal in aqueous media.

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Section: Introductionmentioning

confidence: 99%

Two different routes to prepare porous biodegradable composite membranes containing nanoclay

Zanini,

Ferreira,

Barbosa

et al. 2023

J of Applied Polymer Sci

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“…The Na-Bent dispersions are widely used in industrial processes because of their exceptional colloidal and rheological properties. [2] The physical and chemical properties of Ca-based bentonite are mainly characterized by good adsorbability and cohesiveness, but little swelling. Sodium bentonite or organic bentonite shows excellent swelling and colloidal properties.…”

Section: Introductionmentioning

confidence: 99%

Study on Preparation and Performance of High Swelling Bentonite

Yang

Guo

et al. 2018

Matéria (Rio J.)

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For improving the expansibility of natural Ca-based bentonite (Ca-Bent), the Ca-Bent was modified with sodium dodecyl benzene sulfonate(SDBS)-Na 2 CO 3 complex agent by microwave semi-dry method. And the ratio of Na 2 CO 3 to SDBS, microwave power, radiation time and initial temperature on the modification were studied. Furthermore, X-ray diffraction (XRD) patterns and infra-red spectrum (IR) were carried out to characterize , which obtain microstructure of samples. The result showed that the optimized experimental parameters are obtained as follows: Na 2 CO 3 to SDBS ratio 1:1, radiation time 2min, microwave power 600W and initial temperature 120K. Besides, under the optimization conditions, the modified bentonite has swelling volume of 68.5mL/g, cation exchange capacity of 56.2mmol/10 2 g and yield point and plastic viscosity ratio of 1.67, respectively. A comparison of the single factor experiment and orthogonal experiment indicates that the SDBS and Na 2 CO 3 have synergistic effect in the process of modification, especially, under the optimum microwave condition, Na 2 CO 3 increased the anion activity of SDBS, which enhanced the hydrophilicity of modified bentonite. The experimental result show that the process improves the swelling volume of bentonite and the comprehensive performance. So, the modified bentonite was a perfect additive in water drilling mud.

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“…Among clay nanoparticles, the most commonly used layered silicate is montmorillonite (MMT), an aluminosilicate smectite clay. MMT is a cation-poor layered silicate that can be easily separated and/or delaminated (exfoliated) [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…To answer the industry needs to lighten materials while conserving mechanical properties, the incorporation of nanoparticles in polymer matrices appears as a promising option [2][3][4][5][6][7][8][9][10][11][17][18][19][20][21][22][23][24][25]. In this case, a low percentage of nanofillers are desired to both reduce weight and processing equipment wear without compromising the polymer properties and cost.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Clay Amounts on Morphology and Mechanical Performances in Multiscale PET Composites

Barbosa¹,

Chabert

Nassiet

et al. 2011

AIP Conference Proceedings

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This work presents an investigation of the properties of poly(ethylene terephthalate)/glass fibers/nanoclay multiscale composites. The aim is to demonstrate the effect of adding various clay amounts on the morphology and mechanical performances of multiscale PET composites. Multiscale composites were prepared by adding 0.5, 1.0, 3.0, and 5.0 wt% of Cloisite 15A montmorrillonite. Initially, a masterbatch of pure PET blended with 10 wt% of Cloisite 15A was obtained in a co-rotating twin screw extruder. The multiscale composites were then blended via mechanical mixing, and injection moulded by adding the masterbatch to the glass fibre reinforced matrix. The morphological and mechanical characterizations of all compounds are discussed. X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed that the characteristic (001) peak of the nanocomposite obtained by extrusion (masterbatch) shifted to the lower angle region stating an intercalated structure. However, the subsequent injection moulding process changed the morphological structure of the multiscale nanocomposites reducing the basal distance mostly for small loadings of nanoclay. The addition of nanoclay to PET matrices increases the degree of crystallinity, the clay platelets possibly playing the role of nucleating agent, as revealed by DSC and FTIR. The time relaxation spectra broaden as seen by DMA, as the ratio of clay/polymer interfaces increases. The yield stress of composites with 0.5 and 1 wt% of C15A content are enhanced. For more than 3% of nanoclay, the yield stress decreases. The Young's modulus is increased when adding nanoclay. Indeed, clay exfoliation was not attained, but the intercalated particle dispersion improved the stiffness properties of PET/glass fibers/nanoclay composites.

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Efeitos de diferentes argilas organofílicas nas propriedades de compósitos PET/Bentonita

Cited by 4 publications

References 20 publications

Two different routes to prepare porous biodegradable composite membranes containing nanoclay

Two different routes to prepare porous biodegradable composite membranes containing nanoclay

Study on Preparation and Performance of High Swelling Bentonite

Effect of Clay Amounts on Morphology and Mechanical Performances in Multiscale PET Composites

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