Avaliação das características de transporte em membranas de poliamida 66 preparadas com diferentes solventes

Poletto, Patrícia; Duarte, Jocelei; Lunkes, Matias S.; Santos, Venina dos; Zeni, Mára; Meireles, Carla da Silva; Filho, Guimes Rodrigues; Bottino, A.

doi:10.1590/s0104-14282012005000041

Cited by 7 publications

(8 citation statements)

References 14 publications

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“…Recently, the membrane technology is applied in several industrial processes presenting numerous advantages, such as continuous processing with low energy consumption and easy combination with other separation processes [1]. In the early 1970s, besides the development of classical separation techniques, new synthetic membranes, which can be used as a selective barrier, were developed.…”

Section: Introductionmentioning

confidence: 99%

Influence of Processing Type in the Morphology of Membranes Obtained from PA6/MMT Nanocomposites

Ferreira

Pereira

Paz

et al. 2014

Advances in Materials Science and Engineering

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The nanocomposites have an extensive use in the current process of membrane preparation, taking into account their unique features as membranes. Thus, the study of nanocomposite processing to obtain membranes is highly important. In this work, Brazilian clay was used (Brasgel PA) for the preparation of polyamide/clay nanocomposite. The nanocomposites were produced in a high rotation homogenizer and in a twin screw extruder. From the nanocomposites and pure polymers processed in the two equipments, membranes were prepared by the immersion-precipitation method, using formic acid as solvent. By X-ray diffraction (XRD), the formation of exfoliated and/or partially exfoliated structures with changes in the crystalline phases of the polyamide was observed. From scanning electron microscopy images, it was observed that the processing clearly influenced the membrane morphology.

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Section: Introductionmentioning

confidence: 99%

Influence of Processing Type in the Morphology of Membranes Obtained from PA6/MMT Nanocomposites

Ferreira

Pereira

Paz

et al. 2014

Advances in Materials Science and Engineering

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“…A tensão de molhabilidade e o ângulo de contato ilustram a facilidade com que uma superfície tem de realizar ligações de hidrogênio (ELZBIECIAK et al, 2008 Bovino (com massa molecular de 150.000 g.mol -1 ). Dessa forma, o grau de retenção é calculado pela Equação (1), conforme Poletto et al (2012).…”

Section: Teste De Tensão De Molhabilidade E âNgulo De Contatounclassified

Produção E Caracterização De Membranas Poliméricas, Usando Os Aditivos Cloreto De Potássio E De Lítio, Em Condições Idênticas

et al. 2016

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Neste trabalho, foi investigado a produção de membranas poliméricas porosas assimétricas planas de 8 e 10% Fluoreto de Polivinilideno (PVDF), 1% de Polimetacrilato de Metila (PMMA), 1% de diferentes aditivos (sal KCl ou LiCl) e como solvente, o N-N-Dimetilformamida. Para isso, um sistema automatizado e a técnica de Inversão de Fases foram utilizados para a síntese das membranas e estas foram caracterizadas quanto ao grau de retenção das proteínas globulares BSA e ϒ-Globulina, estimativa do raio médio de poros, fluxo de água de osmose reversa e de soluções de 100 mg/L das respectivas proteínas globulares. Os resultados da respectiva caracterização mostraram que as membranas sintetizadas com LiCl, em relação às sintetizadas com KCl, tiveram maior retenção de proteínas globulares e espessura, raio médio de poros e fluxos de permeado aquoso menores. Assim, é possível averiguar que as membranas de mesma concentração polimérica produzidas com LiCl, nas mesmas condições físicas e operacionais, são mais eficientes.

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“…A disadvantage is the impossibility of being steam sterilized due to the hygroscopicity of the polymer matrix, causing a swelling and a decreasing in pore size. Polyamide membranes are used in MF and RO applications …”

Section: Introductionmentioning

confidence: 99%

“…Polyamide membranes are used in MF and RO applications. [6,7] Recently, various types of clay, such as montmorillonite, have been used as reinforcement in the production of polymer nanocomposites [8][9][10] and promising results for applications of polyamide nanocomposite in membranes have been published. [11][12][13][14] The objective of this research was to evaluate the microstructure and the porosity of the polyamide 6 polymer and hybrid membranes for wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Microporous Membranes Applied in Wastewater Treatment

Medeiros

Lima

et al. 2019

Macromolecular Symposia

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In this work, membranes of pure polyamide 6 (PA6) and hybrids with 1, 3, and 5% in weight of organophilic montmorillonite (OMMT) clay in the form of thin porous films are obtained by the phase inversion technique. The membranes are characterized by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), contact angle (CA), and flow measurements (FM). Through X‐ray diffraction, it is revealed that the hybrid membranes with OMMT have an exfoliated and/or partially exfoliated structure. From FTIR and DSC analyses of hybrid membranes with OMMT, it is found that the spectra and the crystalline melting temperature remained practically unchanged compared to PA6 membrane. From the SEM, it is verified that the addition of the clay caused an increase in the quantity and uniformity of pores distribution in the surface and cross section of these membranes. By MIP, it is observed that the presence of clay in the membrane caused an increase in the average pore diameters. By the contact angle, it is verified that the membrane with clay had a higher value of contact angle for the distilled water when compared to the angle obtained with the synthetic oil. The water flux of the membrane with clay is higher than that obtained by the membrane of pure PA6, due its surface structure with larger pore diameters, favoring its permeability. The obtained hybrid membrane presented adequate porosity morphology for wastewater treatment.

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Avaliação das características de transporte em membranas de poliamida 66 preparadas com diferentes solventes

Cited by 7 publications

References 14 publications

Influence of Processing Type in the Morphology of Membranes Obtained from PA6/MMT Nanocomposites

Influence of Processing Type in the Morphology of Membranes Obtained from PA6/MMT Nanocomposites

Produção E Caracterização De Membranas Poliméricas, Usando Os Aditivos Cloreto De Potássio E De Lítio, Em Condições Idênticas

Hybrid Microporous Membranes Applied in Wastewater Treatment

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