Study of Preparation Metallocene Based LLDPE Extra-Fibers by Melt Electrospinning Process

2012 ◽  
Vol 512-515 ◽  
pp. 2424-2427
Author(s):  
Na Zhao ◽  
Tai Qi Liu ◽  
Rui Xue Liu
Keyword(s):  
Field Strength ◽  
High Viscosity ◽  
Electrospinning Process ◽  
Electrospun Fibers ◽  
Optimal Parameters ◽  
Common Solution ◽  
Melt Electrospinning ◽  
Fine Fiber ◽  
Electrospinning Method ◽  
Solution Electrospinning

In this paper, metallocene based LLDPE (mLLDPE) extra-fine fiber , which can not be processed by a common solution electrospinning method.was successfully prepared via a melt electrospinning method. First, a self-designed melt electrospinning device was manufctured and it was used to produce mLLDPE fibers . Then LLDPE extra-fine fiber was successfully prepared by addition of viscosity-reducing additive such as wax, and the resulted fiber was charctered by SEM. Last, the optimal parameters for the preparation of mLLDPE fiber was determined. The experimental results show that commercial mLLDPE can hardly be processed to fibers because of its high viscosity. The diameter and morphology of resulted mLLDPE electrospun fibers depend on the electrospinning parameters such as electric field strength and collecting distance.

Progress in Preparation of Phenolic Fibers by Electrospinning

2015 ◽  
Vol 815 ◽  
pp. 638-642
Author(s):  
Gai Xie ◽  
Yong Liu ◽  
Hong He ◽  
Ke Jian Wang
Keyword(s):  
Electrical Conductivity ◽  
Electrospun Fibers ◽  
Flexible Materials ◽  
Melt Electrospinning ◽  
Electrospinning Method ◽  
Solution Electrospinning ◽  
Adsorbent Materials

Phenolic fiber is a versatile material. This article focused on introduction of the progress of generating phenolic fibers using solution electrospinning method and its applications, as well as the trail exploration of preparing phenolic fibers by melt electrospinning. For the research on preparation of phenolic fibers using solution electrospinning, researchers added polymers or additive agents to adjust the viscosity and electrical conductivity of the spinning solution. Then they cured and carbonized the electrospun fibers to reach their varied aims. After these two processes, the brittle nature of the phenolic fibers has been greatly changed. What’s more, the modification makes it easier to be dealed with in the analysis tests and be more suitable to be applied as adsorbent materials, nonconductive materials, and flexible materials.

scholarly journals The Effect of Dye and Pigment Concentrations on the Diameter of Melt-Electrospun Polylactic Acid Fibers

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2321 ◽  
Author(s):  
N.K. Balakrishnan ◽  
K. Koenig ◽  
G. Seide
Keyword(s):  
Electrical Conductivity ◽  
Polylactic Acid ◽  
Electrical Resistance ◽  
Polymer Melt ◽  
High Viscosity ◽  
Electrospinning Process ◽  
Polymer Aggregates ◽  
Melt Electrospinning ◽  
Coarse Fibers ◽  
Solution Electrospinning

Sub-microfibers and nanofibers produce more breathable fabrics than coarse fibers and are therefore widely used in the textiles industry. They are prepared by electrospinning using a polymer solution or melt. Solution electrospinning produces finer fibers but requires toxic solvents. Melt electrospinning is more environmentally friendly, but is also technically challenging due to the low electrical conductivity and high viscosity of the polymer melt. Here we describe the use of colorants as additives to improve the electrical conductivity of polylactic acid (PLA). The addition of colorants increased the viscosity of the melt by >100%, but reduced the electrical resistance by >80% compared to pure PLA (5 GΩ). The lowest electrical resistance of 50 MΩ was achieved using a composite containing 3% (w/w) indigo. However, the thinnest fibers (52.5 µm, 53% thinner than pure PLA fibers) were obtained by adding 1% (w/w) alizarin. Scanning electron microscopy revealed that fibers containing indigo featured polymer aggregates that inhibited electrical conductivity, and thus increased the fiber diameter. With further improvements to avoid aggregation, the proposed melt electrospinning process could complement or even replace industrial solution electrospinning and dyeing.

scholarly journals Size-Controllable Melt-Electrospun Polycaprolactone (PCL) Fibers with a Sodium Chloride Additive

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1768 ◽  
Author(s):  
Piyasin ◽  
Yensano ◽  
Pinitsoontorn
Keyword(s):  
Electrostatic Force ◽  
Electrospun Fiber ◽  
Polymer Melt ◽  
High Viscosity ◽  
Electrospinning Process ◽  
Electrospun Fibers ◽  
Glass Syringe ◽  
Melt Electrospinning ◽  
Size And Morphology ◽  
Two Parameters

Melt-electrospun polycaprolactone (PCL) fibers were fabricated by using NaCl as an additive. The size and morphology of the PCL fibers could be controlled by varying the concentration of the additive. The smallest size of the fibers (2.67 0.57) µm was found in the sample with 8 wt% NaCl, which was an order of magnitude smaller than the PCL fibers without the additive. The melt-electrospun fibers were characterized using the differential scanning calorimeter (DSC), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) techniques. Interestingly, a trace of NaCl was not found in any melt-electrospun fiber. The remaining PCL after melt-electrospinning was evaporated by annealing, and the NaCl residual was found in the glass syringe. The result confirmed that the NaCl additive was not ejected from the glass syringe in the melt-electrospinning process. Instead, the NaCl additive changed the viscosity and the polarization of the molten polymer. Two parameters are crucial in determining the size and morphology of the electrospun fibers. The higher NaCl concentration could lead to higher polarization of the polymer melt and thus a stronger electrostatic force, but it could also result in an exceedingly high viscosity for melt-electrospinning. In addition, the absence of NaCl in the melt-electrospun PCL fibers is advantageous. The fibers need not be cleaned to remove additives and can be directly exploited in applications, such as tissue engineering or wound dressing.

scholarly journals Fabrication of Polyurethane/Polylactide (PU/PLDL) Nanofibers Using Electrospinning Method

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2459
Author(s):  
Marta Lech ◽  
Joanna Mastalska-Popławska ◽  
Jadwiga Laska
Keyword(s):  
Tissue Engineering ◽  
Regenerative Medicine ◽  
Synthetic Polymers ◽  
Electrospinning Process ◽  
Rheological Parameters ◽  
Electrospun Fibers ◽  
Lower Viscosity ◽  
Electrospinning Method ◽  
Aligned Fibers ◽  
Pure Acetone

Polylactide and aliphatic polyurethane are biodegradable synthetic polymers which are broadly used as biomaterials in regenerative medicine for implants and scaffolds for tissue engineering. In this paper, the detailed studies of the fabrication of the electrospun fibers of polyurethane/polylactide mixtures were described. The influence of the used solvent (dimethylformamide (DMF)) and diluents (acetone and dichloromethane (DCM)) on the rheological parameters and electrospinning of the described mixtures was examined. Rheological studies showed that polyure-thane/polylactide mixtures have mostly non-Newtonian character, strongly influenced by the diluent. Solutions containing 50 wt.% or more of polyurethane became less viscous after the addition of DCM or acetone, whereas those with bigger amount of polylactide showed higher viscosity after the addition of DCM and lower viscosity after the addition of acetone. Optimized electrospinning process has been elaborated. Fibers with diameters from 250 nm up to 1 µm have been produced and compared. Pure acetone worsened the electrospinning process, but the more DCM was in the mixture, the thinner and more aligned fibers were produced.

Formation of PA12 fibres via melt electrospinning process: parameter analysis and optimisation

2019 ◽  
Vol 40 (1) ◽  
pp. 49-56
Author(s):  
Dalia Buivydiene ◽  
Lauryna Dabasinskaite ◽  
Edvinas Krugly ◽  
Linas Kliucininkas
Keyword(s):  
Fibre Diameter ◽  
Electrospinning Process ◽  
Process Parameter ◽  
Parameter Analysis ◽  
Diameter Distribution ◽  
Melt Temperature ◽  
Average Value ◽  
Screening Experiments ◽  
Melt Electrospinning ◽  
Solution Electrospinning

Abstract Melt electrospinning is a fast-emerging technique for fibre formation. While the process is similar to solution electrospinning, the absence of solvents broadens the applications, avoiding the potential toxicity of solvent residues and enables the usage of non-dissolvable polymers. In this article, the influence of selected melt electrospinning process parameters (tip-to-collector distance, voltage, and melt temperature) on fibre diameter and diameter distribution was investigated. The screening experiments indicated that the lowest fibre diameter median was 2.19 μm. Based on the dependencies between each process parameter and median fibre diameter, the authors used response-surface plots to determine the optimal conditions to produce fibres with the desired fibre diameters. The lowest fibre diameters were obtained with the following process parameter input values: temperature, 348°C; voltage, 19 kV; and tip-to-collector distance, 3 cm. The obtained fibres indicated that the average value of fibre diameter medians decreased in comparison to the screening experiment and the median fibre diameter for the sample “Optim.” was 1.27 μm.

scholarly journals Effect of polar additives on melt electrospinning of nonpolar polypropylene

2014 ◽  
Vol 79 (5) ◽  
pp. 587-596 ◽  
Author(s):  
Chen Zhiyuan ◽  
Jianyun He ◽  
Zhao Fengwen ◽  
Liu Yuexing ◽  
Liu Yong ◽  
...  
Keyword(s):  
Stearic Acid ◽  
Fiber Diameter ◽  
Sodium Stearate ◽  
Polar Compounds ◽  
Electrospun Fibers ◽  
Average Fiber Diameter ◽  
Melt Electrospinning ◽  
Direct Technique ◽  
Nanoscale Fibers ◽  
Solution Electrospinning

Melt or solution electrospinning is an effective and direct technique for producing nanoscale fibers. Polypropylene (PP) cannot be easily dissolved at ambient temperature. Thus, it was commonly electrospun in melt state. However, compared with solution electrospun fibers, melt electrospun PP fibers are more uneven with bigger diameters. To remedy this problem, polar additives, namely, stearic acid and sodium stearate were added into pure PP. The effects of the additives were investigated. Results showed that contrasting to those of pure PP, the fiber diameter of PP with 8 wt% stearic acid decreased by 69.3 % (from 5.4 ?m to 1.6 ?m). The smallest fiber diameter was 600 nm and the smallest average fiber diameter was 1.8 ?m when the sodium stearate contents were 10 wt% and 8 wt%, respectively. The addition of polar compounds could alter not only the diameters of PP microfibers, but also the distribution of diameters, the processing current, and even the thermal properties of fibers. The microcosmic mechanisms for these changes were interpreted.

Role of Macromolecular Factor in Polymer Solution Electrospinning Process

2017 ◽  
Vol 49 (3) ◽  
pp. 151-160
Author(s):  
Yu. N. Filatov ◽  
I. Yu. Filatov ◽  
M. A. Smul’skaya
Keyword(s):  
Polymer Solution ◽  
Electrospinning Process ◽  
Solution Electrospinning

scholarly journals Electrospun Nylon-6 Nanofibers and Their Characteristics

2020 ◽  
Vol 9 (1) ◽  
pp. 9-19
Author(s):  
Ida Sriyanti ◽  
Meily P Agustini ◽  
Jaidan Jauhari ◽  
Sukemi Sukemi ◽  
Zainuddin Nawawi
Keyword(s):  
Fiber Diameter ◽  
Peak Shift ◽  
Nylon 6 ◽  
Electrospinning Process ◽  
Electrospinning Technique ◽  
Fiber Concentration ◽  
Air Filters ◽  
Xrd Pattern ◽  
Electrospinning Method ◽  
Small Wave

The purposes of this research were to investigate the synthesized Nylon-6 nanofibers using electrospinning technique and their characteristics. The method used in this study was an experimental method with a quantitative approach. Nylon-6 nanofibers have been produced using the electrospinning method. This fiber was made with different concentrations, i.e. 20% w/w (FN1), 25% w/w (FN2), and 30% w/w (FN3). The SEM results show that the morphology of all nylon-6 nanofibers) forms perfect fibers without bead fiber. Increasing fiber concentration from 20% w/w to 30% w/w results in bigger morphology and fiber diameter. The dimensions of the FN1, FN2, and FN3 fibers are 1890 nm, 2350 nm, and 2420 nm, respectively. The results of FTIR analysis showed that the increase in the concentration of nylon-6 (b) and the electrospinning process caused a peak shift in the amide II group (CH2 bond), the carbonyl group and the CH2 stretching of the amide III group from small wave numbers to larger ones. The results of XRD characterization showed that the electrospinning process affected the changes in the XRD pattern of nylon-6 nanofiber (FN1, FN2, and FN3) in the state of semi crystal. Nylon-6 nanofibers can be used for applications in medicine, air filters, and electrode for capacitors

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