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Microporous membranes from polyamide 6/national clay nanocomposites - Part 2: microstructural and permeability evaluation; Obtencao de membranas microporosas a partir de nanocompositos de polimida 6/argila nacional - Parte 2: avaliacao microestrutural e de permeabilidade das membranas obtidas

Abstract

Organic/inorganic hybrid membranes of polyamide 6 and mineral clay containing layers of silicate were prepared and compared to those of the pure polymer. Use was made of an as-received sodium clay from industry and another organophilized with ammonium quaternary salts (Dodigen and Cetremide). The salts make the clays surface hydrophobic and improve their incorporation into the polymer matrix in the molten state. Membranes were prepared with these nanocomposites using the immersion-precipitation technique with formic acid as a solvent, and precipitation in a water bath as non-solvent. The acid concentration in the solution containing the polymer and the hybrids was varied to study its influence in morphology and permeability of the membranes. An asymmetric morphology consisting of a filter skin and a porous support was observed, with pores both on the surface and in the cross section being affected by the different salts. This asymmetric morphology was also affected significantly by the acid concentration, with thicker filter skins for higher concentrations. The acid concentration affected the pores size and their distribution. The clay particles probably acted as a barrier to the flow. The permeating flux for the two acid concentrations varied as a function of the distinct morphologies. (author)
Authors:
Leite, Amanda M.D.; Araujo, Edcleide M.; Lira, Helio de L.; Paz, Rene Anisio da; Medeiros, Vanessa da Nobrega, E-mail: amandamelissa.lins@yahoo.com.br [1] 
  1. Universidade Federal de Campina Grande (UFCG), PB (Brazil). Departamento de Engenharia de Materiais
Publication Date:
Jun 01, 2014
Product Type:
Journal Article
Resource Relation:
Journal Name: Polimeros (Sao Carlos); Journal Volume: 24; Journal Issue: 1
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; BENTONITE; CLAYS; FORMIC ACID; MEMBRANES; NANOSTRUCTURES; NYLON; PERMEABILITY; POLYAMIDES; SCANNING ELECTRON MICROSCOPY; X-RAY DIFFRACTION
OSTI ID:
22250180
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
Journal ID: ISSN 0104-1428; TRN: BR1400234071355
Availability:
Available from http://www.scielo.br/pdf/po/v24n1/a12v24n1.pdf
Submitting Site:
BRN
Size:
page(s) 72-79
Announcement Date:
Jul 18, 2014

Citation Formats

Leite, Amanda M.D., Araujo, Edcleide M., Lira, Helio de L., Paz, Rene Anisio da, and Medeiros, Vanessa da Nobrega, E-mail: amandamelissa.lins@yahoo.com.br. Microporous membranes from polyamide 6/national clay nanocomposites - Part 2: microstructural and permeability evaluation; Obtencao de membranas microporosas a partir de nanocompositos de polimida 6/argila nacional - Parte 2: avaliacao microestrutural e de permeabilidade das membranas obtidas. Brazil: N. p., 2014. Web.
Leite, Amanda M.D., Araujo, Edcleide M., Lira, Helio de L., Paz, Rene Anisio da, & Medeiros, Vanessa da Nobrega, E-mail: amandamelissa.lins@yahoo.com.br. Microporous membranes from polyamide 6/national clay nanocomposites - Part 2: microstructural and permeability evaluation; Obtencao de membranas microporosas a partir de nanocompositos de polimida 6/argila nacional - Parte 2: avaliacao microestrutural e de permeabilidade das membranas obtidas. Brazil.
Leite, Amanda M.D., Araujo, Edcleide M., Lira, Helio de L., Paz, Rene Anisio da, and Medeiros, Vanessa da Nobrega, E-mail: amandamelissa.lins@yahoo.com.br. 2014. "Microporous membranes from polyamide 6/national clay nanocomposites - Part 2: microstructural and permeability evaluation; Obtencao de membranas microporosas a partir de nanocompositos de polimida 6/argila nacional - Parte 2: avaliacao microestrutural e de permeabilidade das membranas obtidas." Brazil.
@misc{etde_22250180,
title = {Microporous membranes from polyamide 6/national clay nanocomposites - Part 2: microstructural and permeability evaluation; Obtencao de membranas microporosas a partir de nanocompositos de polimida 6/argila nacional - Parte 2: avaliacao microestrutural e de permeabilidade das membranas obtidas}
author = {Leite, Amanda M.D., Araujo, Edcleide M., Lira, Helio de L., Paz, Rene Anisio da, and Medeiros, Vanessa da Nobrega, E-mail: amandamelissa.lins@yahoo.com.br}
abstractNote = {Organic/inorganic hybrid membranes of polyamide 6 and mineral clay containing layers of silicate were prepared and compared to those of the pure polymer. Use was made of an as-received sodium clay from industry and another organophilized with ammonium quaternary salts (Dodigen and Cetremide). The salts make the clays surface hydrophobic and improve their incorporation into the polymer matrix in the molten state. Membranes were prepared with these nanocomposites using the immersion-precipitation technique with formic acid as a solvent, and precipitation in a water bath as non-solvent. The acid concentration in the solution containing the polymer and the hybrids was varied to study its influence in morphology and permeability of the membranes. An asymmetric morphology consisting of a filter skin and a porous support was observed, with pores both on the surface and in the cross section being affected by the different salts. This asymmetric morphology was also affected significantly by the acid concentration, with thicker filter skins for higher concentrations. The acid concentration affected the pores size and their distribution. The clay particles probably acted as a barrier to the flow. The permeating flux for the two acid concentrations varied as a function of the distinct morphologies. (author)}
journal = {Polimeros (Sao Carlos)}
issue = {1}
volume = {24}
journal type = {AC}
place = {Brazil}
year = {2014}
month = {Jun}
}