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Improving hydraulic permeability, mechanical properties, and chemical functionality of cellulose acetate-based membranes by co-polymerization with tetraethyl orthosilicate and 3-(aminopropyl)triethoxysilane

Andrade, Mônica C. ; Pereira, José Carlos ; de Almeida, Nuno ; Marques, Paula ; Faria, Mónica ; Gonçalves, M. Clara

Carbohydrate polymers, 2021-06, Vol.261, p.117813-117813, Article 117813 [Periódico revisado por pares]

England: Elsevier Ltd

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  • Título:
    Improving hydraulic permeability, mechanical properties, and chemical functionality of cellulose acetate-based membranes by co-polymerization with tetraethyl orthosilicate and 3-(aminopropyl)triethoxysilane
  • Autor: Andrade, Mônica C. ; Pereira, José Carlos ; de Almeida, Nuno ; Marques, Paula ; Faria, Mónica ; Gonçalves, M. Clara
  • Assuntos: Amine functionalization ; Asymmetric membrane ; Hybrid membrane ; Monophasic membrane ; Silica ; Sol-gel
  • É parte de: Carbohydrate polymers, 2021-06, Vol.261, p.117813-117813, Article 117813
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: •New membranes made of cellulose acetate-silica-amine networks.•New chemistry to produce asymmetric monophasic membranes.•Increased degrees of freedom in membranes processing.•Potentially new membrane properties to explore. Composite cellulose acetate (CA) membranes are widely used but their multiphase nature results in additive losses, poor mechanical strength, low chemical resistance and thermal stability, limiting their separation/purification yields. To overcome this, we fabricated monophasic hybrid membranes using a modified phase inversion technique, where tetraethylorthosilicate and 3-(aminopropyl)triethoxysilane were added to the CA casting solution. The resulting co-polymerization between CA, silanols and amine-functionalized silica groups, through sol-gel chemistry, was proved by ATR-FTIR (1118 cm−1, ν(SiOC)). The presence of propyl-amine groups increases the hydraulic permeability (3×), the rupture elongation (×1.5), and decreases the Young modulus (×1/2), due to the disruption of the CA-silica 3D network. For high propyl-amine contents this behaviour is reversed due to intensive cross-linking between CA-silica chains (decrease in 903 cm−1, ν(CH3COOC-)). The addition of silica- and amine-based structures to the CA framework increases the system degrees of freedom, opening the door to the design of new CA membranes.
  • Editor: England: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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