Comparative Study of Membranes Obtained from PA6 and PA66/National Clay Nanocomposites

Araújo, Edcleide Maria; Leite, Amanda Melissa Damião; Medeiros, Vanessa da Nobréga; Paz, Renê Anísio da; Lira, Hélio de Lucena

doi:10.5772/20665

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…The XRD patterns of nylon 6,6 NFM and nylon 6,6/ZIF-8 NFM are shown in Figure 2a. The XRD pattern of nylon 6,6 is in good agreement with the literature and had two peaks at 2θ of 20 • and 23 • which were called as phase α (alpha) and related with the formation of a crystalline polyamide phase [27]. Nylon 6,6/ZIF-8 NFM shows more characteristics of nylon 6,6 since both are amorphous.…”

Section: Membrane Crystallizationsupporting

confidence: 83%

Electrospun Nylon 6,6/ZIF-8 Nanofiber Membrane for Produced Water Filtration

Halim

Wirzal

Bilad

et al. 2019

Water

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This study develops electrospun nylon 6,6 nanofiber membrane (NFM), incorporating zeolitic imidazolate framework-8 (ZIF-8) as the additive for produced water (PW) filtration. Electrospun NFM is suitable to be used as a filter, especially for water treatment, since it has a huge surface area to volume ratio, high porosity, and great permeability compared to the conventional membranes. These properties also enhance its competitiveness to be used as reverse osmosis pre-treatment, as the final stage of PW treatment water reuse purpose. However, the fouling issue and low mechanical strength of NFM reduces hydraulic performance over time. Therefore, this study employs ZIF-8 as an additive to improve nylon 6,6 NFM properties to reduce fouling and increase membrane tensile strength. Results show that the optimum loading of ZIF-8 was at 0.2%. This loading gives the highest oil rejection (89%), highest steady-state pure water permeability (1967 L/(m2·h·bar)), 2× higher than untreated nylon 6,6 NFM with tensile strength 5× greater (3743 MPa), and a steady-state permeability of 1667 L/(m2·h·bar) for filtration of real produced water.

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Section: Membrane Crystallizationsupporting

confidence: 83%

Electrospun Nylon 6,6/ZIF-8 Nanofiber Membrane for Produced Water Filtration

Halim

Wirzal

Bilad

et al. 2019

Water

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“…Such surface morphology is typical of both solution and melt-crystallized PA6 films and sheets. 77,78 Here, the nanofillers are ANFs whose dimensions are measured to range between 2−5 nm in diameter and 3−10 μm in length (Figure S2A,B). Nonetheless, once redispersed in polar solvents such as formic acid, DMSO and DMAc, the ANFs usually undergo swelling and exhibit a slight increase in diameter.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Aramid Nanofiber Reinforced Polymer Nanocomposites via Amide–Amide Hydrogen Bonding

Nasser

Zhang

Lin

et al. 2020

ACS Appl. Polym. Mater.

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Polymer nanocomposites have received tremendous attention over the past several decades; however, they can be challenging to implement without establishing chemical interaction between the nanofillers and the matrix. Poorly suited matrix materials can lead to agglomerations and poor interfacial stress transfer mechanisms, which limits the mechanical performance of the resulting polymer nanocomposites. Here, thermoplastic nanocomposites incorporating aramid nanofibers (ANFs) are studied, and it is shown that the performance of the nanocomposite is highly dependent on the similarity of the matrix with the ANF's chemical structure, indicating that amide−amide hydrogen bonding leads to improved mechanical properties. Aramid nanofibers are initially isolated and used to prepare polyamide (PA6), polyamide−imide (PAI), and polyimide (PI) nanocomposites. Solution-cast ANF reinforced PA6 nanocomposites displayed more than 62% and 27% increase in their tensile strength and elastic stiffness, respectively. Similarly, ANF reinforced PAI nanocomposites exhibited more than 25% and 40% increase in their tensile strength and elastic stiffness, respectively. However, solution-cast ANF reinforced PI exhibited negligible improvement in strength and stiffness. The contrast in the performance of ANFs as nano-reinforcements in these nanocomposites is attributed to the ability of the ANFs to establish amide−amide hydrogen bonding in a PAI and PA6 matrix, whereas such interactions are unavailable in PI. This work shows that the introduction of ANF nanofillers may offer a rapid approach free of preprocessing to improve the mechanical properties of polyamide-based nanocomposites through amide−amide hydrogen bonding, allowing for cost-effective and simplified production of stronger polymer materials.

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Influence of the Polymer Content in the Preparation of Polymeric Membranes

Nóbrega

Leite

Araújo

et al. 2012

MSF

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This work aims to evaluate the effect of polymer content in the preparation of membranes obtained from polyamide 6/national clay nanocomposites. The polymeric membranes were produced varying the polymer content at 20 and 22% and using the technique of precipitation by immersion, which consists of three main steps: preparation a homogeneous polymer solution, scattering the solution on a surface forming a film of determined thickness and finally formation of polymeric structure of membrane by separation phases the system. The obtained results by scanning electron microscopy (SEM) indicated that the content of polymer changes the pore formation, the distribution and density, thereby obtaining membranes with different pore sizes, and it was possible to observe that the higher the polymer content, the lower will the pore diameter and more thicker will be the selective membrane layer.

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Comparative Study of Membranes Obtained from PA6 and PA66/National Clay Nanocomposites

Cited by 3 publications

References 26 publications

Electrospun Nylon 6,6/ZIF-8 Nanofiber Membrane for Produced Water Filtration

Electrospun Nylon 6,6/ZIF-8 Nanofiber Membrane for Produced Water Filtration

Aramid Nanofiber Reinforced Polymer Nanocomposites via Amide–Amide Hydrogen Bonding

Influence of the Polymer Content in the Preparation of Polymeric Membranes

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