Morphological Evaluation of Silicone/Clay Slurries by Small-angle/Wide-angle X-ray Scattering
نویسندگان
چکیده
Pastas de argilas em siliconas foram obtidas por mistura mecânica de diferentes fluidos de silicona e argilas montmorillonitas. Duas séries de pastas contendo (1) montmorillonita natural (MMT) e (2) montmorillonita orgânica (O-MMT) foram preparadas usando poli(dimetilsiloxano) com finais de cadeias Si(CH 3 ) 2 OH (PDMS-OH), poli(dimetilsiloxanoco-metilpropilóxido de etileno siloxano) (PDMS-PEO) ou emulsão de poli(dimetilsiloxanoco-aminoetilaminopropilmetilsiloxano) em água (PDMS-NH 2 ). A morfologia das pastas foi caracterizada por espalhamento de raios-X em baixo/alto ângulo usando detector bidimensional (SAXS/WAXS-2D). As pastas preparadas com PDMS-OH apresentaram apenas um aumento discreto na separação das lamelas, enquanto aquelas preparadas com PDMS-PEO e PDMS-NH 2 apresentaram um aumento pronunciado, resultando em tactóides expandidos. Além disso, a análise da região de SAXS indicou a presença de lâminas finas (lamelas esfoliadas e/ou empilhamento de poucas lamelas) e tactóides expandidos nas pastas MMT/PDMS-PEO e MMT/PDMS-NH 2 . Esta estrutura hierárquica também foi encontrada nas pastas preparadas com a O-MMT.
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