Transition metals supported on al-pilcs as catalysts for C6H5Cl oxidation

Oliveira, Luiz C.A.; Lago, Rochel M.; Fabris, José Domingos; Solar, Carmen Quintana del; Sapag, Karim

doi:10.1590/s0104-66322003000100009

Cited by 11 publications

(9 citation statements)

References 7 publications

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“…Similar results have been observed in previous work with UHMWPE. 27 On the other hand, the presence of the carbon/clay particles significantly increased the H M values to ΔH M 193-252 J g -1 and also the crystallinity to 65-83%. These results indicate that the carbon/clay particles are likely playing a role as nucleating agents.…”

Section: Characterization Of Polymeric Matrix Nanocompositementioning

confidence: 96%

“…Pure montmorillonite clay showed the typical peak at 2θ ca. 8° corresponding to the basal plane spacing d 001 , 27 associated to the lamellar structure of the MMT. After CVD at 700 °C, the d 001 diffraction disappeared indicating the collapse of the lamellar structure.…”

Section: Characterization Of the Carbon-clay Particlesmentioning

confidence: 99%

“…Babiker and Yu 7 have described an increase of 14% of Young's modulus with 1 wt.% of an organophilic clay by extrusion process. Liu et al 27 showed the increase of 42% of Young's modulus to UHMWPE with 1 wt.% of a pure montmorillonite clay blended in torque rheometer.…”

Section: Characterization Of Polymeric Matrix Nanocompositementioning

confidence: 99%

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Use of Amphiphilic Composites based on Clay/Carbon Nanofibers as Fillers in UHMWPE

Silva¹,

Lago²,

Veloso³

et al. 2017

J. Braz. Chem. Soc.

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In this work, it is proposed a new strategy to improve the dispersion of inorganic fillers in polymeric matrices by producing surface carbon nanostructures. Clay/carbon nanofibers particles were prepared and used as fillers to improve the mechanical and thermal properties of ultra-high molecular weight polyethylene (UHMWPE). Thermogravimetry (TG), differential scanning calorimetry (DSC), elemental analyses, Raman, X-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that chemical vapor deposition (CVD) with ethanol at different temperatures, i.e. 700, 800 and 900 °C with and without Fe catalyst, can be used to produce carbon (0.5-3.6 wt.%), mainly as nanofibers, on the clay surface. The use of these clay/carbon particles as fillers in UHMWPE at 1 and 3 wt.% produced an increase in the yield stress from 16 to ca. 20 MPa and Young modulus from 314 MPa for pure UHMWPE to values near 395-408 MPa. Moreover, the presence of the carbon/clay composites led to a strong improvement of the thermal properties of the UHMWPE increasing the decomposition T onset (degradation start temperature) from 445 up to 472 °C. It was also observed by the crystallization enthalpies that the UHMWPE increased the crystallinity from 55 to 80-85% in the presence of the carbon composites. These results are discussed in terms of the strong interactions of the hydrophobic carbon nanostructures on the clay surface with the polymer hydrophobic chains.

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Section: Characterization Of Polymeric Matrix Nanocompositementioning

confidence: 96%

Section: Characterization Of the Carbon-clay Particlesmentioning

confidence: 99%

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Use of Amphiphilic Composites based on Clay/Carbon Nanofibers as Fillers in UHMWPE

Silva¹,

Lago²,

Veloso³

et al. 2017

J. Braz. Chem. Soc.

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show abstract

“…The incorporation of nickel species into the 1.0 MD was achieved by either ion exchange [28] with Ni(NO 3 ) 2 or by impregnation-decomposition method [29] using, Ni(acac) 2 . The extent of ion exchange is limited by the CEC value, while the impregnation-decomposition method enables the introduction of higher amounts of nickel.…”

Section: Modification Of Bentonitementioning

confidence: 99%

“…The applied acid treatment conditions were chosen so to enable only partial dissolution of the raw material. Chosen acid treated bentonite was further modified with nickel either by ion exchange [28] with Ni(NO 3 ) 2 or by impregnation/decomposition method [29] with nickel acetylacetonate, Ni(acac) 2 . Glassy carbon electrode was modified with the obtained materials.…”

Section: Introductionmentioning

confidence: 99%