scholarly journals Fabrication of piezoelectric poly(l-lactic acid)/BaTiO3 fibre by the melt-spinning process

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hyun Ju Oh ◽  
Do-Kun Kim ◽  
Young Chan Choi ◽  
Seung-Ju Lim ◽  
Jae Bum Jeong ◽  
...  
Keyword(s):  
Phase Transition ◽  
Lactic Acid ◽  
Crystalline Phase ◽  
Melt Spinning ◽  
Piezoelectric Properties ◽  
Polymeric Materials ◽  
Processing Conditions ◽  
Post Processing ◽  
Scanning Calorimetry ◽  
Spinning Process

Abstract Poly(l-lactic acid) (PLLA) based piezoelectric polymers are gradually becoming the substitute for the conventional piezoelectric ceramic and polymeric materials due to their low cost and biodegradable, non-toxic, piezoelectric and non-pyroelectric nature. To improve the piezoelectric properties of melt-spun poly(l-lactic acid) (PLLA)/BaTiO3, we optimized the post-processing conditions to increase the proportion of the β crystalline phase. The α → β phase transition behaviour was determined by two-dimensional wide-angle x-ray diffraction and differential scanning calorimetry. The piezoelectric properties of PLLA/BaTiO3 fibres were characterised in their yarn and textile form through a tapping method. From these results, we confirmed that the crystalline phase transition of PLLA/BaTiO3 fibres was significantly enhanced under the optimised post-processing conditions at a draw ratio of 3 and temperature of 120 °C during the melt-spinning process. The results indicated that PLLA/BaTiO3 fibres could be a one of the material for organic-based piezoelectric sensors for application in textile-based wearable piezoelectric devices.

A green method to fabricate porous polypropylene fibers: development toward textile products and mechanical evaluation

2019 ◽  
Vol 90 (5-6) ◽  
pp. 547-560 ◽  
Author(s):  
Xiang Yan ◽  
Aurélie Cayla ◽  
Fabien Salaün ◽  
Eric Devaux ◽  
Pengqing Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Melt Spinning ◽  
Weight Ratio ◽  
Mechanical Analysis ◽  
Water Soluble ◽  
Drawing Ratio ◽  
Scanning Calorimetry ◽  
Excellent Thermal Stability ◽  
Crystallization Behaviors ◽  
Spinning Process

In this study, a series of immiscible polymer blend fibers with polypropylene (PP) and polyvinyl alcohol (PVA) was obtained by a melt spinning process, and two different draw ratios were attempted. Efforts were made to obtain the porous PP fibers by removing the water-soluble PVA phase. The thermal properties of the blends were tested by thermogravimetric analysis and differential scanning calorimetry. The blends showed excellent thermal stability and differentiated fractionated crystallization behaviors of PP. The melt flow indexes of the blends were evaluated, exhibiting a higher fluidity than that of the neat polymers. Among the possible candidates for the spinning process, only the PP70–PVA30 had suitable spinnability, for which the draw ratio reached 3. The morphology of the fibers was investigated by selective extraction experiment and scanning electron microscopy, as well as wide-angle X-ray diffraction. The biphasic morphology and the crystallization behaviors varied according to the PVA content. Furthermore, the mechanical properties of the multifilament fibers were studied via tensile testing and dynamical mechanical analysis. The 70/30 weight ratio (PP/PVA) was the most suitable for producing biphasic fibers with a high degree of accessibility in PVA and mechanical properties that increase with the increase in the drawing ratio. The feasibility of fabric knitting was checked, and the mechanical properties and air permeability of the obtained textile structure were also evaluated.

scholarly journals A Study of the Mechanical Behavior and Crystal Structure of UHMWPE/HDPE Blend Fibers Prepared by Melt Spinning

2018 ◽  
Vol 13 (3) ◽  
pp. 155892501801300
Author(s):  
Fei Wang ◽  
Lichao Liu ◽  
Ping Xue ◽  
Mingyin Jia ◽  
Hua Sun
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Tensile Strength ◽  
Mechanical Behavior ◽  
Melt Spinning ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Melt Flow Index ◽  
Flow Index ◽  
Scanning Calorimetry ◽  
Spinning Process

Ultrahigh molecular weight polyethylene (UHMWPE) and high-density polyethylene (HDPE) blend fibers with the highest tensile strength of 1.13 GPa were prepared by a melt spinning process. The crystal structure and mechanical behavior of the as-spun filaments and fibers were studied by differential scanning calorimetry (DSC), scanning electron microscopy (SEM), atomic force microscope (AFM), X-ray diffraction (XRD), sound velocity orientation test and tensile strength test. The results suggested that the degree of molecular chain orientation, crystallinity and mechanical properties of the blend fibers were improved by blending with the low melt flow index (MFI) HDPE. The crystal grains of low MFI HDPE blend fibers that were formed by more highly oriented molecular chains could be stretched more effectively in the drawing direction, and the improved mechanical properties were due to the more regular and compact crystal structure.

scholarly journals Biodegradable 3D Printed Scaffolds of Modified Poly (Trimethylene Carbonate) Composite Materials with Poly (L-Lactic Acid) and Hydroxyapatite for Bone Regeneration

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3215
Author(s):  
Honglei Kang ◽  
Xudong Jiang ◽  
Zhiwei Liu ◽  
Fan Liu ◽  
Guoping Yan ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Composite Materials ◽  
Polymeric Materials ◽  
Bone Cell ◽  
Cell Multiplication ◽  
X Rays ◽  
Trimethylene Carbonate ◽  
Scanning Calorimetry

Biodegradable scaffolds based on biomedical polymeric materials have attracted wide interest in bone transplantation for clinical treatment for bone defects without a second operation. The composite materials of poly(trimethylene carbonate), poly(L-lactic acid), and hydroxyapatite (PTMC/PLA/HA and PTMC/HA) were prepared by the modification and blending of PTMC with PLA and HA, respectively. The PTMC/PLA/HA and PTMC/HA scaffolds were further prepared by additive manufacturing using the biological 3D printing method using the PTMC/PLA/HA and PTMC/HA composite materials, respectively. These scaffolds were also characterized by Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatography (GPC), automatic contact-angle, scanning electronic micrographs (SEM), diffraction of X-rays (XRD), differential scanning calorimetry (DSC), and thermogravimetry (TG). Subsequently, their properties, such as mechanical, biodegradation, cell cytotoxicity, cell compatibility in vitro, and proliferation/differentiation assay in vivo, were also investigated. Experiment results indicated that PTMC/PLA/HA and PTMC/HA scaffolds possessed low toxicity, good biodegradability, and good biocompatibility and then enhanced the cell multiplication ability of osteoblast cells (MC3T3-E1). Moreover, PTMC/PLA/HA and PTMC/HA scaffolds enhanced the adhesion and proliferation of MC3T3-E1 cells and enabled the bone cell proliferation and induction of bone tissue formation. Therefore, these composite materials can be used as potential biomaterials for bone repatriation and tissue engineering.

Analysis of the influence of electrospinning process parameters on the morphology of poly(lactic acid) fibres

2019 ◽  
Vol 2 (96) ◽  
pp. 73-78
Author(s):  
W. Matysiak ◽  
A. Kapica ◽  
T. Tański ◽  
A. Dubiel
Keyword(s):  
Lactic Acid ◽  
Optimal Parameter ◽  
Polymeric Materials ◽  
Electrospinning Process ◽  
Polymer Materials ◽  
Poly Lactic Acid ◽  
One Dimensional ◽  
Wide Range ◽  
Spinning Process ◽  
Tissue Scaffolding

Purpose: The article focuses on the production of polymer nanofibres from poly(lactic acid) using the electro-spinning method, i.e. the technique of forming fibres in an electrostatic field. The main aim of the publication was to analyse the influence of the distance between electrodes on the morphology of one-dimensional polymeric materials obtained. Design/methodology/approach: In the practical part of the study solutions of polylactide in acetone and a mixture of chloroform/dimethylformamide (DMF) were produced. After 72 hours of mixing, no homogeneous solutions were obtained, therefore a solution consisting of a polylactide dissolved in chloroform was prepared, to which dimethylformamide was added in order to dilute the mixture. The morphology of the nanostructures obtained was analysed by means of a scanning electron microscope (SEM) equipped with an X-ray energy dispersion spectrometer (EDS), which allowed to analyse the chemical composition of the nanofibres produced. The electro-spinning method used to obtain fibres is characterized by high versatility - it gives the possibility to produce fibres from a wide range of polymers. Electro-spinning is also an economic method, and spinned fibres have a wide application potential. Findings: Nanofibres obtained by electro-spinning from the previously produced solution, regardless of the distance between the nozzle and the collector (10 or 20 cm) did not show any significant discrepancies in the values of measured diameters. Fibres obtained at increased distance between electrodes (20 cm) are characterized by a smaller average diameter value, but the difference is small, fluctuating between 48-49 nm. In the case of the sample formed during electro-spinning at the distance of the nozzle - collector equal to 10 cm and the sample produced at the distance doubled, no defects in the structure of the obtained nanofibres were observed. The analysis of topographic images of surfaces produced in the course of nanostructures' work did not show any significant influence of the distance between the nozzle and collector on the diameter of fibres. No defects in the structure of one-dimensional polymer materials obtained allowed to state that the distance between the nozzle and the collector in the range of 10-20 cm is the optimal parameter of the electro-spinning process allowing to obtain smooth, untangled fibres. Practical implications: The fibrous polymer mats obtained during the electro-spinning process of polylactide can be used as protective clothing materials, as drug delivery systems, as tissue scaffolding and as filtration membranes. Originality/value: At present, there are few articles in the literature on the electrospinning process, due to the fact that it is a constantly developing matte for the production of nanofibres. Moreover, most of the research focuses on fibres obtained from nonbiodegradable polymers, which do not have the advantages of fibres obtained from polylactide.

Biodegradable poly (lactic acid)/poly (butylene succinate) fibers with high elongation for health care products

2017 ◽  
Vol 88 (15) ◽  
pp. 1735-1744 ◽  
Author(s):  
Elwathig AM Hassan ◽  
Salah Eldin Elarabi ◽  
You Wei ◽  
Muhuo Yu
Keyword(s):  
Lactic Acid ◽  
Melt Spinning ◽  
Strength Loss ◽  
Poly Lactic Acid ◽  
Butylene Succinate ◽  
Morphological Studies ◽  
Biodegradable Poly ◽  
Spinning Process ◽  
High Elongation ◽  
The Impact

Poly (lactic acid)/poly (butylene succinate) (PLA/PBS) blend fibers with high miscibility and improved elongation with comparable mechanical strength were fabricated using the melt spinning process in order to reduce the impact on the environment by long-lasting plastics-based composites. The PLA/PBS blend fibers produced in different ratios have revealed high miscibility, which has been confirmed by morphological studies. The thermal properties showed the melting temperature of PLA at 167.13℃ and PLA/PBS blends at 169.18℃, and an increased content of PBS in blends also led to improved crystallinity. Importantly, during tensile testing, it is observed that the fracture behavior of the specimen changed from brittle fracture of neat PLA to ductile fracture of the blends, as demonstrated by the significant increase in the elongation at break with comparable tensile strength and modulus. Furthermore, the washing fastness, rubbing fastness, exhaustion values, strength loss, and shade depth ( K/ S value) for the knitted and dyed fibers were explored. It was found that the exhaustion and K/ S value increased when the temperature increased, but the strength decreased. The exhaustion and K/ S value of PLA/PBS blend fabrics improved compared to pure PLA fabric, with excellent washing and rubbing fastness.

scholarly journals Threads Made with Blended Biopolymers: Mechanical, Physical and Biological Features

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 901 ◽  
Author(s):  
Annamaria Visco ◽  
Cristina Scolaro ◽  
Alberto Giamporcaro ◽  
Salvatore De Caro ◽  
Elisabetta Tranquillo ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Bacterial Growth ◽  
Melt Spinning ◽  
Average Diameter ◽  
Poly Lactic Acid ◽  
Biological Features ◽  
Starting Point ◽  
Spinning Process ◽  
Biological Tests ◽  
Mechanical Tensile

Poly (Lactic Acid), PLA, and Poly (ε-CaproLactone), PCL, compatibilized with Ethyl Ester l-Lysine Triisocyanate (LTI) can be employed as biomaterials. We mixed PLA with PCL and LTI in a twin extruder and by a melt spinning process obtained threads with an average diameter of about 0.3 mm. In order to study the possible application of these threads, mechanical tensile (with the calorimetric and morphological investigations) and biological tests were performed. The results highlighted these biopolymers as promising materials for sutures since they can be rigid and elastic (especially by increasing the PCL amount in the blend), and they are bioactive, able to inhibit bacterial growth. This paper represents a starting point to optimize the blend composition for biomedical suture application.

Crystallization Behavior and Curie Temperature Properties of Al Doped Nd-Fe-B Based Nanocomposite Permanent Magnet

2012 ◽  
Vol 585 ◽  
pp. 149-153
Author(s):  
Sudipta Halder ◽  
A.K. Panda ◽  
Amitava Mitra ◽  
Amitava Basu Mallick
Keyword(s):  
Curie Temperature ◽  
Permanent Magnet ◽  
Crystallization Temperature ◽  
Melt Spinning ◽  
Annealing Temperature ◽  
Vacuum Arc ◽  
Scanning Calorimetry ◽  
Melt Spun ◽  
Vacuum Arc Furnace ◽  
Spinning Process

The work is primarily concerned with the development of nanocrystalline Nd-Fe-B, based permanent magnet with high Curie temperature. An alloy of composition Fe81Nd7Al2B10 has been prepared using vacuum arc furnace and subjected to using Melt-Spinning process for preparation of amorphous flakes. Differential scanning calorimetry (DSC) has been performed to determine the crystallization temperature and activation energy of the melt spun amorphous ribbons. Subsequently the melt spun ribbon was subjected to annealing at below and above the crystallization temperatures to identify effect of Al on the Curie temperature. It was noteworthy for the effect of alloying Al above crystallization temperature. The Curie temperature increases to by almost 1.3 times with increase in annealing temperature.

scholarly journals Structure Tuning and Electrical Properties of Mixed PVDF and Nylon Nanofibers

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6096
Author(s):  
Petr Černohorský ◽  
Tatiana Pisarenko ◽  
Nikola Papež ◽  
Dinara Sobola ◽  
Ştefan Ţălu ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Photoelectron Spectroscopy ◽  
Polyvinylidene Fluoride ◽  
Complex Analysis ◽  
Polymeric Materials ◽  
Sample Surface ◽  
Polyamide 6 ◽  
Scanning Calorimetry ◽  
Spinning Process ◽  
Ft Ir

The paper specifies the electrostatic spinning process of specific polymeric materials, such as polyvinylidene fluoride (PVDF), polyamide-6 (PA6, Nylon-6) and their combination PVDF/PA6. By combining nanofibers from two different materials during the spinning process, new structures with different mechanical, chemical, and physical properties can be created. The materials and their combinations were subjected to several measurements: scanning electron microscopy (SEM) to capture topography; contact angle of the liquid wettability on the sample surface to observe hydrophobicity and hydrophilicity; crystallization events were determined by differential scanning calorimetry (DSC); X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and Fourier-transform infrared spectroscopy (FT-IR) to describe properties and their changes at the chemical level. Furthermore, for the electrical properties of the sample, the dielectric characteristics and the piezoelectric coefficient were measured. The advantage of the addition of co-polymers was to control the properties of PVDF samples and understand the reasons for the changed functionality. The innovation point of this work is the complex analysis of PVDF modification caused by mixing with nylon PA6. Here we emphasize that the application of nylon during the spin influences the properties and structure (polarization, crystallization) of PVDF.

scholarly journals Zn22Al4Ag ALLOY MICROWIRES CASTING TO RAPID SOLIDIFICATION PROCESS BY ROTATING DRUM

10.6036/10098 ◽  
2022 ◽  
Vol 97 (1) ◽  
pp. 53-57
Author(s):  
JUAN MANUEL PRADO LAZARO ◽  
JOSE ANGEL RAMOS BANDERAS ◽  
ISRAEL AGUILERA NAVARRETE ◽  
JAIME ALEJANDRO VERDUZCO MARTINEZ ◽  
ROCIO MARICELA OCHOA PALACIOS
Keyword(s):  
Rapid Solidification ◽  
Melt Spinning ◽  
Thermodynamic Simulation ◽  
Solidification Process ◽  
Rapid Solidification Process ◽  
Rotating Drum ◽  
Scanning Calorimetry ◽  
Jet Stability ◽  
Before And After ◽  
Spinning Process

In this work, the Zn22Al4Ag alloy was synthesized by melting in a muffle furnace.The alloy obtained was characterized by Scanning Electron Microscopy Energy Dispersive Spectroscopy and was analyzed by the X-Ray Diffraction technique, where the crystallinity of the material was verified before and after being processed. Likewise, the Differential Scanning Calorimetry technique was used to obtain the temperatures where phase transformations occurin the alloy. These results were fed to the Termocalc®, software to numerically obtain the phase diagram of the alloy. Subsequently, a section of the ingot was taken to the rapid solidification process by rotating drum. The process variables were manipulated: jet stability, nozzle diameter, distance from the nozzle surface to the cooling medium, the delay time of the molten material in the crucible, speed of the rotating drum and jet angle, until obtaining a microwire with a diameter of ~ 160µm. Finally, it was determined that inadequate control of these parameters can result in powders, flakes or blockage of the crucible outlet. Potentially uses within the micro and nanoworld as an analogy to structural elements and electrical conductors, in addition to its current use as a coating anti-corrosive. Key Words: ZnAlAg alloy, Melt spinning process, Microwire, DSC analysis, Thermodynamic simulation

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