nanocompósitos de pvc com argila organicamente modificada: efeitos do processamento e do método de incorporação da argila pvc/organically modified montmorillonite nanocomposites: effects of processing and clay incorporation methodology

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ID: 164924
2009
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Abstract
Nanocompósitos de poli(cloreto de vinila) (PVC) flexível com argila organicamente modificada (O-MMT) foram preparados utilizando-se diferentes metodologias de produção, de forma a estudar seus efeitos sobre o grau de intercalação/esfoliação da argila. A morfologia dos nanocompósitos obtidos foi avaliada através de difratometria de raios X (DRX) e microscopia eletrônica de transmissão (MET). Foram também avaliadas propriedades de tração e estabilidade térmica estática das formulações preparadas. Nanocompósitos de microestrutura híbrida intercalada/parcialmente esfoliada foram obtidos, independentemente do composto de PVC ter sido processado a partir do pó ou granulado (extrudado previamente), e do método de incorporação da O-MMT à resina de PVC (diretamente no misturador intensivo ou pré-esfoliada em DIDP/OSE a quente). Os plastificantes, presentes na formulação do composto de PVC flexível, exerceram um papel importante no processo de intercalação e esfoliação da argila, facilitando a formação dos nanocompósitos.
Nanocomposites of poly(vinyl chloride) (PVC) and an organically modified montmorillonite (O-MMT) were prepared using different production approaches to assess possible effects on the degree of clay intercalation/exfoliation. The morphology of the nanocomposites was studied using X ray diffratometry and transmission electron microscopy. Tensile properties and static thermal stability were also evaluated. Hybrid intercalated/partially exfoliated nanocomposites were obtained, regardless of whether the PVC compound was processed from the powder (dry blend) or granulated (extruded) samples, or of the methodology used for incorporation of O-MMT into the PVC compound (directly in the intensive mixer or pre-exfoliated in a hot mixture of DIDP/ESO). The plasticizers, present in the flexible PVC compound, exerted an important role in the process of intercalation and exfoliation of the clay, helping the formation of the nanocomposites.
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Authors ;Antonio Rodolfo Jr.;Lucia H. I. Mei
Journal journal of the chemical society, perkin transactions 1
Year 2009
DOI
10.1590/S0104-14282009000100006
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282009000100006
Keywords
pvc

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