Caracterização estrutural de nanocompósitos de blendas HDPE/LLDPE e OMMT obtidos por diferentes sequências de mistura

Passador, Fábio Roberto; Filho, Adhemar C. Ruvolo; Pessan, Luiz Antônio

doi:10.1590/s0104-14282012005000052

Cited by 8 publications

(9 citation statements)

References 27 publications

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“…For polymers with a large amount of branching, such as LDPE, there is greater separation of the crystalline lamellae, which leads to the formation of regions with a greater amount of amorphous phase (composed of branching and lamellar interconnection molecules). This hinders the crystallization and thus reduces the crystallite size compared to other polyethylenes, such as high‐density polyethylene (HDPE) and linear low‐density polyethylene . The addition of GC modified the apparent crystallite size of the LDPE.…”

Section: Resultsmentioning

confidence: 99%

A new use for glassy carbon: Development of LDPE/glassy carbon composites for antistatic packaging applications

Santos

Montagna

Rezende

et al. 2018

J of Applied Polymer Sci

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Antistatic packaging is used for the protection and storage of electronic boards and sensitive electronic components. Different polyolefins can be used for the production of antistatic packaging; however, the accumulation of static electricity in these polyolefins may cause serious damage to the electronic components. In this study, since glassy carbon (GC) has good mechanical properties and electrical characteristics, it was used as an antistatic filler and blended with low‐density polyethylene (LDPE). Composites of LDPE with GC in different proportions were prepared in the molten state using a homogenizer rotating at 3000 rpm. The composites were characterized in terms of thermal, mechanical, structural, and electrical properties. The GC is well dispersed and distributed in the LDPE, which contributed to the formation of a percolated network that enhanced antistatic characteristic. An increase of two orders of magnitudes in the electrical conductivity was obtained for the composite with 0.5 wt % of GC and thus it can be used as antistatic packaging. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47204.

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Section: Resultsmentioning

confidence: 99%

A new use for glassy carbon: Development of LDPE/glassy carbon composites for antistatic packaging applications

Santos

Montagna

Rezende

et al. 2018

J of Applied Polymer Sci

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“…Polyamide 12 (PA12) Grilamid® L25 W 20X was produced by EMS-Grivory (China) with a specific mass of 1.02 g/ cm 3 . Attapulgite (ATP) with specification BRM F 14-EPA 13.04 was supplied by Brasil Minas (Brazil), with basic composition of hydrated magnesium silicate (SiO 2 + MgO), specific mass of 2.00 a 2.25 g/cm 3 and pH (5 wt % water solution) 7.0 to 11.0.…”

Section: Methodsmentioning

confidence: 99%

“…The development of polymer matrix nanocomposites with the addition of mineral fillers is of great interest to the polymer industry. The mineral fillers are added to polymer matrix in order to improve the thermal, mechanical and thermomechanical properties, modifying the surface appearance and the processing characteristics and mainly reducing the costs of the polymer composition [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A simple mixing method for polyamide 12/attapulgite nanocomposites: structural and mechanical characterization

Silva

Morgado

Montanheiro³

et al. 2020

SN Appl. Sci.

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In this work, the attapulgite (ATP) was used as a promising mineral clay to prepare polyamide 12 (PA12) matrix polymer nanocomposites. ATP has a relatively low cost compared to other nanoclays and is a very abundant raw material in the northeast region of Brazil. The ATP was characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy and field emission gun scanning electron microscopy (FEG-SEM). The PA12/ATP nanocomposites with 0, 1, 2.5, 5, 7.5 and 10 wt% of ATP were prepared using a simple blending method in a high-speed thermokinetic homogenizer (3000 rpm) in which the melting of the PA12 and the mixture with ATP occurred by friction, followed by hot pressing and stamping of the specimens. The nanocomposites were characterized by mechanical properties, the degree of crystallinity and crystallite size were calculated by XRD, and the morphological characteristics were observed by SEM. The addition of ATP in the PA12 matrix increased the modulus of elasticity, hardness, degree of crystallinity and the apparent crystallite size of the nanocomposites. The addition of up to 5 wt% of ATP increased tensile strength and deformation at break; for higher concentrations, the dispersion was not efficient. A major advantage of using ATP as a reinforcement agent for PA12 is the low cost of this material plus the great interaction with PA12 which can dispense the use of compatibilizer agents and/or surface modification in the ATP, making it a potential material to extend PA12's range of applications.

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“…The compatibilized HDPE/LLDPE blend‐based nanocomposites with 2.5, 5.0, and 7.5 wt% of C20A [designated NC(2.5) , NC(5.0) and NC(7.5) , respectively] were produced by co‐rotational twin‐screw extrusion using the same compounding conditions and were obtained in two steps: (1) LLDPE and LLDPE‐ g ‐MA were first reinforced with organoclay and (2) this nanocomposite was blended with HDPE and HDPE‐ g ‐MA, also by extrusion. This blending protocol was adopted based in our previous work . The final composites were prepared with a blend ratio of 3:1 (HDPE/LLDPE) and compatibilizer/C20A concentration of 2:1.…”

Section: Methodsmentioning

confidence: 99%

Structural, thermal, and gas transport properties of HDPE/LLDPE blend‐based nanocomposites using a mixture of HDPE‐g‐MA and LLDPE‐g‐MA as compatibilizer

Passador

Rúvolo-Filho

Pessan

2016

Polymer Engineering & Sci

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Nanocomposites based on high density polyethylene (HDPE)/linear low density polyethylene (LLDPE) blend were prepared by melt compounding in a twin-screw extruder using organoclay (montmorillonite) as nano-filler and a 50/ 50 wt% mixture of maleic anhydride functionalized high density polyethylene (HDPE-g-MA) and linear low density polyethylene (LLDPE-g-MA) as the compatibilizing system. The addition of a maleated polyethylene-based compatibilizing system was required to improve the organoclay dispersion in the HDPE/LLDPE blend-based nanocomposite. In this work, the relationships between thermal properties, gas transport properties, and morphology were correlated. The compatibilized nanocomposite exhibited an intercalated morphology with a small number of individual platelets dispersed in the HDPE/LLDPE matrix, leading to an significant decrease in the oxygen permeation coefficient of the nanocomposites. A decrease in the carbon dioxide permeability and oxygen permeability with increase of nanoclay was observed for the compatibilized nanocomposites. The carbon dioxide permeability of the compatibilized nanocomposites was lower than the carbon dioxide permeability of the uncompatibilized nanocomposites even with the low intrinsic barrier properties of the compatibilizer. These effects were attributed to a good dispersion of the inorganic filler, good wettability of the filler by the polymer matrix, and strong interactions at the interface that increased the tortuous path for diffusion. Theoretical permeability models were used to estimate the final aspect ratio of nanoclay in the nanocomposite and showed good agreement with the aspect ratio obtained directly from TEM images. POLYM. ENG. SCI.,

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Caracterização estrutural de nanocompósitos de blendas HDPE/LLDPE e OMMT obtidos por diferentes sequências de mistura

Cited by 8 publications

References 27 publications

A new use for glassy carbon: Development of LDPE/glassy carbon composites for antistatic packaging applications

A new use for glassy carbon: Development of LDPE/glassy carbon composites for antistatic packaging applications

A simple mixing method for polyamide 12/attapulgite nanocomposites: structural and mechanical characterization

Structural, thermal, and gas transport properties of HDPE/LLDPE blend‐based nanocomposites using a mixture of HDPE‐g‐MA and LLDPE‐g‐MA as compatibilizer

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