scholarly journals Electrospun Polylactide/Natural Rubber Fibers: Effect Natural Rubber Content on Fiber Morphology and Properties

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2232
Author(s):  
Yulia Tertyshnaya ◽  
Svetlana Karpova ◽  
Maksim Moskovskiy ◽  
Aleksey Dorokhov
Keyword(s):  
Natural Rubber ◽  
Fiber Diameter ◽  
Thermal Characteristics ◽  
Average Fiber Diameter ◽  
Fiber Morphology ◽  
Rubber Content ◽  
Scanning Calorimetry ◽  
Paramagnetic Resonance ◽  
Elongation At Break ◽  
Fiber Materials

Non-woven polylactide-natural rubber fiber materials with a rubber content of 5, 10 and 15 wt.% were obtained by electrospinning. The thermal, dynamic, and mechanical properties of the fibers were determined. It was shown that the average fiber diameter increased with adding of the NR content, while the linear and surface densities changed slightly. Using the differential scanning calorimetry, the thermal characteristics were obtained. It was found that the glass transition temperature of polylactide increased by 2–5 °C, and the melting temperature increased by 2–4 °C in the presence of natural rubber in the samples. By the method of electronic paramagnetic resonance at T = 50 and 70 °C it was determined that the mobility of the amorphous phase in PLA/NR fibers increased with the addition of NR. The adding of NR at a content of 15 wt.% increased the value of elongation at break by 3.5 times compared to pure PLA.

scholarly journals Impact of environmental agents on non-woven polylactide/natural rubber agrofiber

2021 ◽  
Vol 285 ◽  
pp. 07034
Author(s):  
Yulia Tertyshnaya ◽  
Maksim Zakharov ◽  
Alina Ivanitskikh ◽  
Anatoliy Popov
Keyword(s):  
Natural Rubber ◽  
Uv Irradiation ◽  
Thermal Characteristics ◽  
Degree Of Crystallinity ◽  
Distilled Water ◽  
Fibrous Materials ◽  
Scanning Calorimetry ◽  
Melting Temperatures ◽  
Environmental Agents ◽  
The Degree Of Crystallinity

In the work an eco-friendly non-woven fiber made of polylactide and natural rubber with a rubber content from 0 to 15 wt.% was obtained by electrospinning. The influence of distilled water and UV irradiation on the agrofibers has been investigated. The water sorption test showed that the addition of natural rubber into the polylactide matrix does not significantly affect the degree of water absorption of the fibrous materials, which is in the range of 49-50.6%. Thermal characteristics after 180 days of degradation in distilled water at 22±2 oC and UV irradiation at a wavelength of 365 nm during 100 hours were determined using the differential scanning calorimetry. Changes in the values for glass transition and melting temperatures, and the degree of crystallinity were determined.

Effect of Methyl Methacrylate Content in Carbon Black Filled Natural Rubber Compounds

2012 ◽  
Vol 501 ◽  
pp. 3-7
Author(s):  
Abu Bakar Rohani ◽  
Mustafa Kamal Mazlina ◽  
Fauzi Mohd Som
Keyword(s):  
Carbon Black ◽  
Natural Rubber ◽  
Methyl Methacrylate ◽  
Proton Nuclear Magnetic Resonance ◽  
Performance Parameters ◽  
Rubber Content ◽  
Elongation At Break ◽  
Compression Set ◽  
Rubber Compounds ◽  
Emulsion Polymerisation

Natural rubber-grafted-poly(methyl methacrylate) containing 30 and 50 percent of methyl methacrylate (MMA) monomer per 100 parts by weight of the dry rubber content denoted as NR-g-PMMA 30 and NR-g-PMMA 50, respectively were prepared via emulsion polymerisation technique. The occurrences of graft copolymerisation of PMMA onto NR were confirmed by proton Nuclear Magnetic Resonance (1H NMR) and Fourier Transform Infrared (FTIR) following purifications. The reinforcement of rubber by fillers is of great practical and technical importance. Thus, these fillers are added to rubber formulations to optimize the properties to meet a given application or set of performance parameters. In this study, the effect of carbon black in NR-g-PMMA 30 and NR-g-PMMA 50 rubber compounds were evaluated. Our results demonstrated that tensile strength, elongation at break and compression set reduced, while the hardness and solvent resistance increased in the presence of carbon black filler in comparison to the unfilled compound.

Doxorubicin release from optimized electrospun polylactic acid nanofibers

2016 ◽  
Vol 47 (1) ◽  
pp. 71-88 ◽  
Author(s):  
Amir Doustgani
Keyword(s):  
Differential Scanning Calorimetry ◽  
Drug Release ◽  
Polylactic Acid ◽  
Fiber Diameter ◽  
Experimental Result ◽  
Coefficient Of Determination ◽  
Release Mechanism ◽  
Burst Release ◽  
Fiber Morphology ◽  
Scanning Calorimetry

Electrospinning has been known as an efficient method for fabrication of polymer nanofibers. In this study, an electrospun nanofibrous mats based on polylactic acid with a defined release using doxorubicin was developed. The effects of process parameters, such as concentration, distance, applied voltage, temperature and flow rate on the mean diameter of electrospun doxorubicin-loaded polylactic acid nanofibers were investigated. The fiber morphology and mean fiber diameter of prepared nanofibers were investigated by scanning electron microscopy. Differential scanning calorimetry was employed to identify the presence of doxorubicin within nanofibers. Response surface methodology based on a five-level, five-variable central composite design was used to model the average diameter of electrospun polylactic acid/doxorubicin nanofibers. Mean fiber diameter was correlated to these variables by using a polynomial function at a 95% confidence level. The coefficient of determination of the model was found to be 0.93. The predicted fiber diameter was in good agreement with the experimental result. Differential scanning calorimetry results showed that the doxorubicin was loaded into the nanofibers successfully. In vitro drug release in phosphate-buffered solution and acetate buffer for the optimized and non-optimized samples demonstrated that diffusion is the dominant drug release mechanism for drug-loaded fibers. The initial burst release was observed for non-optimized nanofibers compared to optimized nanofibers. Optimized drug-loaded polylactic acid nanofibers could be good candidates for biomedical applications.

Mechanical and Thermal Characteristics of Optimized Electrospun Nylon 6,6 Nanofibers by Using Taguchi Method

NANO ◽  
2019 ◽  
Vol 14 (11) ◽  
pp. 1950139
Author(s):  
Saleh S. Abdelhady ◽  
Said H. Zoalfakar ◽  
M. A. Agwa ◽  
Ashraf A. Ali
Keyword(s):  
Fiber Diameter ◽  
Thermal Characteristics ◽  
Electrospun Nanofibers ◽  
Processing Parameters ◽  
Statistical Technique ◽  
Electrospinning Process ◽  
Diameter Distribution ◽  
Solvent Ratio ◽  
Average Fiber Diameter ◽  
Nylon 6,6

This study is an attempt to optimize the electrospinning process to produce minimum Nylon 6,6 nanofibers by using Taguchi statistical technique. Nylon 6,6 solutions were prepared in a mixture of formic acid (FA) and Dichloromethane (DCM). Design of experiment by using Taguchi statistical technique was applied to determine the most important processing parameters influence on average fiber diameter of Nylon 6,6 nanofiber produced by electrospinning process. The effects of solvent/nylon and FA/DCM ratio on average fiber diameter were investigated. Optimal electrospinning conditions were determined by using the signal-to-noise (S/N) ratio that was calculated from the electrospun Nylon 6,6 nanofibers diameters according to “the-smaller-the-better” approach. The optimum Nylon 6,6 concentration (NY%) and FA/DCM ratio were determined. The morphology of electrospun nanofibers is significantly altered by FA/DCM solvent ratio as well as Nylon 6,6 concentration. The smallest diameter and the narrowest diameter distribution of Nylon 6,6 nanofibers ([Formula: see text][Formula: see text]nm) were obtained for 10 wt% Nylon 6,6 solution in 80 wt% FA and 20 wt% DCM. An increase of 118%, 280% and 26% in tensile strength, modulus of elasticity and elongation at break over as-cast was obtained, respectively. Glass transition temperature of Nylon 6,6 nanofibers were determined by using differential scanning calorimeter (DSC). Analysis of variance ANOVA shows that NY% is the most influential parameter.

The Effect of Silica Nanofiller on the Physical and Thermal Characteristics of Rubber-Based Composites

2021 ◽  
Vol 36 (1) ◽  
pp. 60-68
Author(s):  
A. Chelli ◽  
L. Hemmouche ◽  
H. Ait-Sadi ◽  
D. Trache ◽  
M. Benziane ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Catalytic Effect ◽  
Filler Content ◽  
Thermal Analyses ◽  
Thermal Characteristics ◽  
Butadiene Rubber ◽  
Nano Silica ◽  
Scanning Calorimetry ◽  
Elongation At Break ◽  
Tear Strength

Abstract The use of nano composites in elastomer blends gives outstanding mechanical properties compared to the use of micro and macro composites, even with very low nano filler content. In this paper, we studied the influence of varying proportions of natural rubber (NR) and acrylonitrile butadiene rubber (NBR) reinforced with nano silica on the mechanical and thermal characteristics of the rubber. Mechanical characterizations were carried out with hardness, tensile strength, elongation at break, tear strength, modulus and toughness. For thermal analyses, we used differential scanning calorimetry ( DSC) and Thermogravimetric Analysis (TGA). In most cases, the increase in the percentage of NBR with the presence of nano silica enhances hardness, modulus and toughness, however, it reduces tensile strength, tear strength and elongation at break. It was found that nano silica has a catalytic effect on the mixture, and NBR has a catalytic effect on the decomposition of NR.

scholarly journals The New Generation from Biomembrane with Green Technologies for Wastewater Treatment

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1174 ◽  
Author(s):  
Ahmed Mohamed El-hadi ◽  
Hatem Alamri
Keyword(s):  
Thermal Characteristics ◽  
Electrospinning Process ◽  
Green Technologies ◽  
Scanning Calorimetry ◽  
Elongation At Break ◽  
Triethyl Citrate ◽  
Immiscible Blend ◽  
Solution Casting Method ◽  
New Generation ◽  
Amorphous Part

A biopolymer of polylactic acid (PLLA)/polypropylene carbonate (PPC)/poly (3-hydroxybutrate) (PHB)/triethyl citrate (TEC) blends was prepared by the solution-casting method at different proportions. The thermal characteristics were studied by differential scanning calorimetry (DSC) and thermogravimetry (TG). PHB and TEC were added to improve the interfacial adhesion, crystallization behavior, and mechanical properties of the immiscible blend from PLLA and PPC (20%). The addition of more than 20% of PPC as an amorphous part hindered the crystallization of PLLA. PPC, PHB, and TEC also interacted with the PLLA matrix, which reduced the glass transition temperature (Tg), the cold crystallization temperature (Tcc), and the melting point (Tm) to about 53, 57 and 15 °C, respectively. The Tg shifted from 60 to 7 °C; therefore, the elongation at break improved from 6% (pure PLLA) to 285% (PLLA blends). In this article, biomembranes of PLLA with additives were developed and made by an electrospinning process. The new generation from biopolymer membranes can be used to absorb suspended pollutants in the water, which helps in the purification of drinking water in the household.

Characterization and Multi-Response Morphological Optimization for Preparation of Defect-Free Electrospun Nanofibers Using the Taguchi Method

2017 ◽  
Vol 30 ◽  
pp. 61-75 ◽  
Author(s):  
Jopeth M. Ramis ◽  
Bryan B. Pajarito ◽  
Custer C. Deocaris
Keyword(s):  
Standard Deviation ◽  
Taguchi Method ◽  
Flow Rate ◽  
Fiber Diameter ◽  
Morphological Characteristics ◽  
Polymer Composition ◽  
Solution Flow Rate ◽  
Solvent Ratio ◽  
Average Fiber Diameter ◽  
Fiber Morphology

The study presents a method on producing defect-free polyvinyl alcohol-gelatin (PVAG) nanofibers by considering multiple morphological characteristics of the produced nanofibers using the Taguchi method. Aside from minimizing the average fiber diameter, the method was also used to produce consistent, monodispersed PVAG nanofibers without the usual defects of beading and splattering. The experiments are performed considering the effect of polymer composition (PVAG ratio and solvent ratio of water, formic acid, and acetic acid H2O:FA:HAc) and process factors (tip-to-collector distance TCD and solution flow rate) on fiber morphology. Fiber morphology is measured in terms of 4 responses: average fiber diameter, standard deviation of fiber diameter, occurrence of beading, and occurrence of splattering. Results show that maximum overall desirability for electrospinning PVAG nanofibers at smallest average diameter and deviation (26.10 ± 9.88 nm) with chance of moderate beading and zero splattering is predicted at PVAG mass ratio of 6.5:3.5, H2O:FA:HAc solvent volume ratio of 4:4:2, TCD of 12.5 cm, and flow rate of 1 ml h-1. Results of confirmatory run agree with the predicted factor levels at maximum desirability, with average fiber diameter and standard deviation measured to be 26.95 ± 6.39 nm. PVAG nanofibers of the confirmatory run are also both bead-and splatter-free. Results suggest the application of Taguchi method can offer a robust and rapid approach in deriving the conditions for production of new and high-quality PVAG nanofibers for tissue engineering scaffolds.

scholarly journals Impact of Water and UV Irradiation on Nonwoven Polylactide/Natural Rubber Fiber

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 461
Author(s):  
Yulia Tertyshnaya ◽  
Maria Podzorova ◽  
Maksim Moskovskiy
Keyword(s):  
Natural Rubber ◽  
Uv Irradiation ◽  
Hydrolytic Degradation ◽  
Thermal Characteristics ◽  
Degree Of Crystallinity ◽  
Scanning Calorimetry ◽  
Melt Flow Rate ◽  
Phase Transition Temperatures ◽  
Nonwoven Fiber ◽  
The Degree Of Crystallinity

A nonwoven fiber made of polylactide/natural rubber with a rubber content from 0 to 15 wt.% was obtained by electrospinning from a solution. The water sorption test showed that the addition of natural rubber into the polylactide matrix did not significantly affect the degree of water absorption of the fibers, which was in the range of 48.9–50.6%. The melt flow rate only increased by 0.5 g/10 min at a content of 15 wt.% natural rubber. The thermal characteristics after 120 days of degradation in distilled water and UV irradiation (50 h) at a wavelength of 365 nm were determined using differential scanning calorimetry. Changes in the values of the phase transition temperatures and the degree of crystallinity were determined. It was determined that the fiber samples from all compositions retained the propensity for photo- and hydrolytic degradation.

scholarly journals Characterization of Electrospun Silk Fibroin Scaffolds for Bone Tissue Engineering: A Review

TecnoLógicas ◽  
2020 ◽  
Vol 23 (49) ◽  
pp. 33-51
Author(s):  
Mónica Liliana Mejía Suaza ◽  
Maria Elena Moncada ◽  
Claudia Patricia Ossa-Orozco
Keyword(s):  
Tissue Engineering ◽  
Tensile Strength ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Silk Fibroin ◽  
Thermal Characteristics ◽  
Future Research ◽  
Fiber Morphology ◽  
Scanning Calorimetry ◽  
Electron Microscopic

Silk Fibroin (SF) is a natural polymer obtained from the Bombyx mori silkworm. It has been used in bone tissue engineering thanks to its favorable biocompatibility, adhesion, low biodegradability, and tensile strength properties. Electrospinning is a technique to develop nanofibers. It uses high voltages to convert polymer solutions into porous nanostructured scaffolds with a good ratio between superficial area and volume. In this paper, we examine the effect of the electrospinning parameters on fiber morphology once the spun fibers have been treated. In addition, we present different physicochemical characterizations of electrospun SF scaffolds such as their morphology (via Scanning Electron Microscopic—SEM—), crystalline structure (via Fourier Transform Infrared—FTIR—spectroscopy and X-Ray Diffraction—XRD—), thermal characteristics (via Differential Scanning Calorimetry—DSC—and Thermogravimetric Analysis—TGA—), and mechanical properties (tensile strength). Finally, we discuss the potential applications and impacts of electrospun SF in bone tissue engineering and future research trends.

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