Propriedades mecânicas de nanocompósitos de polipropileno e montmorilonita organofílica
01 Jun 2006-Polimeros-ciencia E Tecnologia (Associação Brasileira de Polímeros)-Vol. 16, Iss: 2, pp 136-140
TL;DR: In this article, a mixture of polypropylene and commercial montmorillonite organophilic Cloisite 20A is used to construct a twoswrew extruder for melting.
Abstract: Nanocomposites of polypropylene and commercial montmorillonite organophilic Cloisite 20A containing 2.5%, 5%, 7.5% and 10% of clay with polypropylene-graft-maleic anhydride as coupling agent were prepared through the melt intercalation by twin-screw extruder. The materials were characterized by x-ray diffraction, tensile and impact properties according to ASTM D638 and D256 test methods, respectively. The x-ray diffraction results showed exfoliated or intercalated structures for different concentrations of the clay. The tensile modulus improved with the increase of the amount of the clay while the impact strength showed unsatisfactory results.
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TL;DR: In this paper, the authors used post-consumer waste espresso coffee capsules as raw material for a novelty composite, which should perform well concerning mechanical and thermal properties for a home composter product application, substituting neat polymers.
13 citations
TL;DR: In this article, a study aimed to produce and characterize biofilms obtained from hybrid sorubim (Pseudoplatystoma reticulatum × pseudo-plegula corruscans) protein isolate (HSPI) incorporated with glycerol (G) and clove essential oil (CEO).
Abstract: The indiscriminate disposal and the accumulation of non-biodegradable packaging have been causing serious environmental problems. One of the alternatives is the use of biodegradable films. Proteins are among the natural biopolymers most used to produce biofilms. This study aimed to produce and characterize biofilms obtained from hybrid sorubim (Pseudoplatystoma reticulatum × Pseudoplatystoma corruscans) protein isolate (HSPI) incorporated with glycerol (G) and clove essential oil (CEO). The HSPI was obtained by the pH shift method, using as raw material the mechanically separated meat of hybrid sorubim. The films presented different properties depending on the concentrations of the studied variables. In general, the film with the best characteristics was the treatment 6 (25% G, 2.5 g HSPI and 0.5 g CEO). Due to the low concentration of CEO used, the films were not able to efficiently inhibit microbial activity.
13 citations
TL;DR: In this paper, an effort was made to understand the influence that a compatibilizing agent and a metal deactivator bonded to a primary stabilizer has on the thermal stability of polypropylene/polypropylene-grafted maleic anhydride/organic montmorillonite (PP/PP-g-MA/OMMT) nanocomposites.
12 citations
TL;DR: In this article, the effect of injection molding conditions on the mechanical properties of polyamide 6/glass fiber/montmorillonite (PA6/GF/MMT) composites is investigated, and the results demonstrate that composites processed at lower mass temperatures exhibited higher tensile strength and flexural strength.
Abstract: This work describes the first part of a series of studies on the effect of injection molding conditions on the mechanical properties of polyamide 6/glass fiber/montmorillonite (PA6/GF/MMT) composites, wherein the effect of the injection molding mass temperature on the mechanical properties of the composite is investigated. The results demonstrate that composites processed at lower mass temperatures exhibited higher tensile strength and flexural strength. These findings are explained by the fact that the use of different mass temperatures leads to PA6 matrices with different degrees of crystallinity. In addition, changes in the mass temperature affect the fiber–matrix adhesion of the composite and the intercalation between the matrix and the various components in the nanocomposite. POLYM. COMPOS., 36:237–244, 2015. © 2014 Society of Plastics Engineers
11 citations
TL;DR: In this paper, an epoxy composite reinforced with curaua fibres and/or organophilic clay is evaluated, and the performance of nano-clays is evaluated.
Abstract: This work evaluates an epoxy composite reinforced with curaua fibres and/or organophilic clay. Epoxy polymers reinforced with nano-clays are also assessed. Composites are manufactured by cold press...
10 citations
Cites methods from "Propriedades mecânicas de nanocompó..."
...In contrast, untreated fibre composites reveal a fibre pull-out mechanism, which contributes to keep the two halves of the samples together after the test, as reported by Paiva et al.42...
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...In contrast, untreated fibre composites reveal a fibre pull-out mechanism, which contributes to keep the two halves of the samples together after the test, as reported by Paiva et al.(42)...
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References
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TL;DR: In this article, a review of polymer-layered silicate nanocomposites is presented, where the polymer chains are sandwiched in between silicate layers and exfoliated layers are more or less uniformly dispersed in the polymer matrix.
Abstract: This review aims at reporting on very recent developments in syntheses, properties and (future) applications of polymer-layered silicate nanocomposites. This new type of materials, based on smectite clays usually rendered hydrophobic through ionic exchange of the sodium interlayer cation with an onium cation, may be prepared via various synthetic routes comprising exfoliation adsorption, in situ intercalative polymerization and melt intercalation. The whole range of polymer matrices is covered, i.e. thermoplastics, thermosets and elastomers. Two types of structure may be obtained, namely intercalated nanocomposites where the polymer chains are sandwiched in between silicate layers and exfoliated nanocomposites where the separated, individual silicate layers are more or less uniformly dispersed in the polymer matrix. This new family of materials exhibits enhanced properties at very low filler level, usually inferior to 5 wt.%, such as increased Young’s modulus and storage modulus, increase in thermal stability and gas barrier properties and good flame retardancy.
5,901 citations
TL;DR: An overview of polymer-clay hybrid nanocomposites is provided with emphasis placed on the use of alkylammonium exchanged smectite clays as the reinforcement phase in selected polymer matrices as discussed by the authors.
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TL;DR: High voltage electron microscopy (HVEM) has been extensively applied in the field of materials science as discussed by the authors, covering the study of heavy metals, ceramics and minerals, large-scale structures, dynamic processes and radiation damage.
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TL;DR: In this article, a polypropylene (PP)/clay nanocomposites (PPCN) were prepared via grafting-melt compounding by using a new kind of co-intercalation organophilic clay which had a larger interlayer spacing than the ordinarily organophilous clay only modified by alkyl ammonium.
562 citations
TL;DR: In this paper, the mesoscale structure and the strength of polymer-nanoparticle interactions have been investigated using viscoelastic measurements of layered silicate-based polymer nanocomposites.
Abstract: Layered silicate based polymer nanocomposites have gained significant technological interest because of the recent commercialization of nylon 6 and polypropylene based materials. Aside from the natural interests in understanding and improving the processing of these hybrids, viscoelastic measurements have also proven to be a sensitive tool to probe the mesoscale structure and the strength of polymer–nanoparticle interactions.
358 citations