scispace - formally typeset
Search or ask a question
Journal ArticleDOI

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.

Content maybe subject to copyright    Report

Citations
More filters
Journal ArticleDOI
TL;DR: In this article, the influence of the presence of montmorillonite clay in the degradation of composites, showing the limitations of TGA and emphasizing the importance of complementary analyzes such as differential scanning calorimetry (DSC) and oxidation induction time (OIT).

57 citations

Journal ArticleDOI
TL;DR: In this paper, the physical properties of bionanocomposites based on chitosan (Ch) reinforced with different commercial nanoclays and further incorporated with rosemary essential oil (REO) were evaluated through mechanical and X-ray diffraction analyses.

50 citations

Journal ArticleDOI
TL;DR: In this article, the degradation of polypropylene (PP) and montmorillonite (MMT) nanocomposites was evaluated in a twin screw extruder up to five times.

43 citations

Journal ArticleDOI
TL;DR: In this paper, the interaction of different nanoparticles modified with 3-aminopropyl triethoxysilane (APTES) was studied and compared with the morphology and the final properties of the PHBV nanocomposites.

40 citations

Journal ArticleDOI
TL;DR: Agarwal et al. as discussed by the authors found that the incorporation of an argila to o polipropileno (PP) melhorou a estabilidade termica do polimero nos compositos com 5% em massa de BENT and 3 e 5% in massa of BENT-org.
Abstract: Uma argila bentonita policationica nacional foi utilizada para a producao de uma argila organofilica, obtida a partir da sintese com o sal de amonio quaternario, cloreto de cetiltrimetilamonio. A argila tratada com o sal orgânico (BENT-org) e a nao tratada (BENT) foram caracterizadas por espectroscopia de absorcao no infravermelho (FTIR) e difratometria de raios X (DRX). Posteriormente, as argilas foram misturadas com o polipropileno (PP) pelo metodo de intercalacao por fusao em uma extrusora dupla-rosca co-rotativa. Os compositos foram caracterizados pelas tecnicas de DRX, calorimetria diferencial de varredura (DSC) e analise termogravimetrica (TGA). Os resultados de FTIR e DRX mostraram a presenca dos grupos caracteristicos do sal de amonio e a intercalacao deste entre as camadas do argilomineral. As analises de DRX dos compositos com 3 e 5% em massa de BENT-org evidenciaram a presenca de picos deslocados para regioes de baixo ângulo, sugerindo a intercalacao das cadeias do polimero entre as camadas da argila. Os resultados de DSC indicaram que a argila pode ter atuado como agente nucleante devido ao aumento na Tcc (temperatura de cristalizacao no resfriamento) dos compositos. De acordo com os resultados de TG, constatou-se que a incorporacao da argila ao PP melhorou a estabilidade termica do polimero nos compositos com 5% em massa de BENT e 3 e 5% em massa de BENT-org.

27 citations

References
More filters
Journal ArticleDOI
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

Journal ArticleDOI
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.

2,403 citations

Journal ArticleDOI
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.

1,700 citations

Journal ArticleDOI
01 Dec 2001-Polymer
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

Journal ArticleDOI
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