Wicking properties of various polyamide nanofibrous structures with an optimized method

Schoenmaker, Bert De; Schueren, Lien Van der; Vrieze, Sander De; Westbroek, Philippe; Clerck, Karen De

doi:10.1002/app.33117

Cited by 39 publications

(41 citation statements)

References 48 publications

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“…Figure 3b shows that the equation fitted well to the wicking behavior of electrospun mats considering the whole experiment, as previously reported 6,7 . The differences in wicking rate described before are easier to observe.…”

Section: Methodssupporting

confidence: 86%

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Wetting of Hydrophilic Electrospun Mats Produced by Blending SEBS with PEO–PPO–PEO Copolymers of Different Molecular Weight

Kurusu

Demarquette

2016

Langmuir

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The interaction of electrospun mats with water is critical for many possible applications, and the water contact angle on the surface is the parameter usually measured to characterize wetting. Although useful for hydrophobic surfaces, this approach is limited for hydrophilic mats, where wicking has also to be considered. In this case, it is still unclear how the fiber surface chemical composition and morphology will affect the wetting behavior of electrospun mats. In this work, wetting was studied with different hydrophilic membranes produced by blending thermoplastic elastomer SEBS with amphiphilic PEO-PPO-PEO molecules. Three different types of PEO-PPO-PEO, with different molar masses, PEO content and physical form were used. The effect of these differences on the wetting behavior of the electrospun mats was evaluated by contact angle goniometry, wicking measurements and 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 different imaging techniques. X-ray photoelectron spectroscopy was used to characterize the surface chemical composition. The smaller molecules quickly saturated the surface at low concentrations, making the mats hydrophilic. The sheath of PEO-PPO-PEO also resulted in fast absorption of water, when comparing the saturated and non-saturated surfaces. Longer PEO chain-ends seemed to hinder complete segregation and also led to a higher activation time when in contact with water. Liquid PEO-PPO-PEO was easily leached by water.

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Section: Methodssupporting

confidence: 86%

“…The latter have been used to determine the contact angle of electrospun mats indirectly 5 , or to compare the wicking rate of spunbond and electrospun fibers 7 , mats of the same polymer with different fiber diameter 6 or mats containing two types of fibers independently co-electrospun 4 .…”

Section: Introductionmentioning

confidence: 99%

Wetting of Hydrophilic Electrospun Mats Produced by Blending SEBS with PEO–PPO–PEO Copolymers of Different Molecular Weight

Kurusu

Demarquette

2016

Langmuir

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“…A World Precision Instruments Inc. (U.S.A.) SP101I syringe pump and a Gamma High Voltage Research (U.S.A.) ES30P-5W voltage source were used. The fibers were spun using a 20% by weight solution of nylon-6 in a 1:1 by weight mixture of formic and acetic acid [17]. The syringe pump flow rate was 9.1-microliters per minute.…”

Section: B Electrospinningmentioning

confidence: 99%

“…This makes it sufficiently tough and durable for use as the sensor substrate. As nylon is also used in some clothing, it is easily spun or woven and altered to fit the size and shape of the desired testing area, and the high surface area and hydrophilicity of nylon nanofibers make it an excellent fabric for use at the surface of the skin [17].…”

Section: Introductionmentioning

confidence: 99%

Fabric Nanocomposite Resistance Temperature Detector

et al. 2015

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This paper illustrates the characterization of a fabric resistance temperature (RTD) detector made from electrospun nylon-6 functionalized with multiwalled carbon nanotubes (MWCNTs) and polypyrrole (PPy) for use in supracutaneous applications like smart clothing, prosthetic sockets, and other medical devices where a temperature detecting fabric is better suited than a rigid detector. The nanocomposite material acts like a RTD, because the conductivity increases linearly with temperature. The empirically determined temperature coefficient of resistance (TCR) is reported for this material, and is -0.204 ± 0.008%/C. Development of a simple and scalable process for constructing the detector utilized electrospinning nylon-6 as a membrane style substrate, vacuum filtration of MWCNTs onto the nylon scaffold, and vapor phase polymerization of pyrrole to PPy onto the MWCNT functionalized nylon nanofibers. The optimal loading of MWCNTs is 6.6 wt%. The conductivity of the device follows a percolative behavior and TCR values indicate this is a viable option for temperature detection. Resistance decreases with increasing temperature, which indicates this is a negative TCR material.

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“…Since polyamides (PA) are known as polymers sensitive to variations in the humidity, this polymer type is selected. Focus is given to two different PA's, PA 4.6 and PA 6.9, the latter having a significantly lower hydrophilicity [20]. This varying affinity for water may result in a different electrospinning behaviour depending on the RH.…”

Section: Introductionmentioning

confidence: 99%

Effect of the relative humidity on the fibre morphology of polyamide 4.6 and polyamide 6.9 nanofibres

et al. 2012

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To obtain uniform and reproducible nanofibres, it is important to understand the effect of the different electrospinning parameters on the nanofibre morphology. Even though a lot of literature is available on the electrospinning of nanofibres, only minor research has been performed on the effect of the relative humidity (RH). This paper investigates the influence of this parameter on the electrospinning process and fibre morphology of the hydrophilic polyamide 4.6 and the less hydrophilic polyamide 6.9. First, the electrospinning process and deposition area of the nanofibres is examined at 10, 50 and 70 % RH. Subsequently, the effect of the polyamide concentration and solvent ratio on the fibre morphology is investigated using scanning electron microscopy and differential scanning calorimetry. It was found that the nanofibre diameter decreased with increasing RH. This resulted in less stable crystals for polyamide 4.6 while electrospinning of polyamide 6.9 at higher RH led to slightly more stable crystals. In conclusion, the water affinity of a polymer is an important factor in predicting the nanofibre morphology at different humidities

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Wicking properties of various polyamide nanofibrous structures with an optimized method

Cited by 39 publications

References 48 publications

Wetting of Hydrophilic Electrospun Mats Produced by Blending SEBS with PEO–PPO–PEO Copolymers of Different Molecular Weight

Wetting of Hydrophilic Electrospun Mats Produced by Blending SEBS with PEO–PPO–PEO Copolymers of Different Molecular Weight

Fabric Nanocomposite Resistance Temperature Detector

Effect of the relative humidity on the fibre morphology of polyamide 4.6 and polyamide 6.9 nanofibres

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