Articoli di riviste: "Thermoplastic polyurethane nanofibers"

1

Samimi Gharaie, Sadaf, Sima Habibi e Hosein Nazockdast. "Fabrication and characterization of chitosan/gelatin/thermoplastic polyurethane blend nanofibers". Journal of Textiles and Fibrous Materials 1 (1 gennaio 2018): 251522111876932. http://dx.doi.org/10.1177/2515221118769324.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Polymer blending is a method to provide nanocomposite nanofibers with improved strength and minimal defects. Chitosan exhibits biocompatibility, biodegradability, antimicrobial activity, and wound healing properties. A combination of gelatin and thermoplastic polyurethane (TPU) blends was explored as a means to improve the morphological deficiencies of chitosan nanofibers and facilitate its electrospinnability. The morphology of the electrospun chitosan, chitosan/gelatin, and chitosan/gelatin/TPU blend nanofibers were characterized using scanning electron microscopy (SEM), while the miscibility and thermal behavior of the blends were determined using differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy/attenuated total reflectance (FTIR/ATR). The optimum results were achieved in blend with 3 wt% chitosan, 8 wt% gelatin, and 5 wt% TPU, which resulted nanofibers with a mean diameter of 100.6 nm ± 17.831 nm.

2

Li, Biyun, Yinhu Liu, Shuo Wei, Yuting Huang, Shuwen Yang, Ye Xue, Hongyun Xuan e Huihua Yuan. "A Solvent System Involved Fabricating Electrospun Polyurethane Nanofibers for Biomedical Applications". Polymers 12, n. 12 (18 dicembre 2020): 3038. http://dx.doi.org/10.3390/polym12123038.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

A novel Trichloromethane (TCM)/2,2,2-Trifluoroethanol (TFE) solvent system was developed for fabricating electrospun thermoplastic polyurethane (TPU) nanofibers. TPU solution stability made from this novel solvent system was improved compared to that from the traditional N, N-Dimethylformamide (DMF)/Tetrahydrofuran (THF) solvent system. The minimum TPU solution concentration that can be electrospun was decreased to 0.5% w/v. The conductivity and viscosity of the TPU solution increased with the increasing ratio of TFE in the solvent system. The obtained electrospun TPU nanofibers fabricated from this novel solvent system showed smooth morphology and uniform diameter distribution. Mechanical strength of TPU nanofibers was improved using this new solvent system. Young’s modulus and tensile strength of the electrospun TPU nanofiber meshes first decreased and then increased, while the strain elongation ratio first increased and then decreased. The new solvent system significantly improves the fiber elongation ratio while maintaining the modulus and tensile strength. The chemical structure of the TPU was not affected by the TCM/TFE solvent system. Electrospun TPU nanofiber meshes prepared by using the TCM/TFE solvent system showed better cytocompatibility, which means the electrospun TPU fibrous scaffold has great potential in biomedical application.

3

Mohamadi, Parian, Elham Mohsenzadeh, Cedric Cochrane e Vladan Koncar. "Investigation of conductive printed thermoplastic polyurethane nanofibers to detect the clogging of air filters". IOP Conference Series: Materials Science and Engineering 1266, n. 1 (1 gennaio 2023): 012005. http://dx.doi.org/10.1088/1757-899x/1266/1/012005.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Abstract Recently, air pollution attracted many worries because of its high number of deaths per year. To solve the problem, the industries are trying to fabricate the giant air filtration system for public areas. However, the clogging of air filters should be detected in real-time to change or clean them. E-textile is a very fascinating field, which is often used in medical, safety, military and clogging detection applications. These components are integrated into soft textile materials according to their usage requirements. One of the most attractive textile structures is the nanofibers due to their advantageous properties such as porosity, lightweight, and high surface area. To have conductive nanofiber-based membrane sensors, two in situ electrical conductivity principles using conductive particles and surface conductivity, such as immersion and printing methods are recommended. In this research, the thermoplastic polyurethane (TPU) nanofibers’ membranes are produced using an electrospinning system and the carbon ink was printed on the surface of nanofibers to apply in textile sensors applications. SEM images showed the uniform structure of the nanofibers and the porosity of the system even after printing. The electromechanical properties of printed membranes demonstrated the change of electrical resistance under stretch. Conclusively, these conductive membranes could be employed as strain sensors to detect the small changes in the output airflow indicated the possible clogging of air filters.

4

Salas, Julia Isidora, Diego de Leon, Sk Shamim Hasan Abir, M. Jasim Uddin e Karen Lozano. "Functionalized Thermoplastic Polyurethane Nanofibers: An Innovative Triboelectric Energy Generator". Electronic Materials 4, n. 4 (18 dicembre 2023): 158–67. http://dx.doi.org/10.3390/electronicmat4040014.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

A triboelectric nanogenerator (TENG) is one of the most significantly innovative microdevices for built-in energy harvesting with wearable and portable electronics. In this study, the forcespinning technology was used to synthesize a nanofiber (NF) mat-based TENG. Polyvinylidene fluoride (PVDF) membrane was used as the negative triboelectric electrode/pole, and chemically designed and functionalized thermoplastic polyurethane (TPU) was used as the positive electrode/pole for the TENG. The electronic interference, sensitivity, and gate voltage of the synthesized microdevices were investigated using chemically modified bridging of multi-walled carbon nanotubes (MWCNT) with a TPU polymer repeating unit and bare TPU-based positive electrodes. The chemical functionality of TPU NF was integrated during the NF preparation step. The morphological features and the chemical structure of the nanofibers were characterized using a field emission scanning electron microscope and Fourier-transform infrared spectroscopy. The electrical output of the fabricated MWCNT-TPU/PVDF TENG yielded a maximum of 212 V in open circuit and 70 µA in short circuit at 240 beats per minute, which proved to be 79% and 15% higher than the TPU/PDVF triboelectric nanogenerator with an electronic contact area of 3.8 × 3.8 cm2, which indicates that MWCNT enhanced the electron transportation facility, which results in significantly enhanced performance of the TENG. This device was further tested for its charging capacity and sensory performance by taking data from different body parts, e.g., the chest, arms, feet, hands, etc. These results show an impending prospect and versatility of the chemically functionalized materials for next-generation applications in sensing and everyday energy harvesting technology.

5

Alhazov, Dmitriy, Arkadiusz Gradys, Pawel Sajkiewicz, Arkadii Arinstein e Eyal Zussman. "Thermo-mechanical behavior of electrospun thermoplastic polyurethane nanofibers". European Polymer Journal 49, n. 12 (dicembre 2013): 3851–56. http://dx.doi.org/10.1016/j.eurpolymj.2013.09.028.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Chen, Rui, Lijun Qiu, Qinfei Ke, Chuanglong He e Xiumei Mo. "Electrospinning Thermoplastic Polyurethane-Contained Collagen Nanofibers for Tissue-Engineering Applications". Journal of Biomaterials Science, Polymer Edition 20, n. 11 (gennaio 2009): 1513–36. http://dx.doi.org/10.1163/092050609x12464344958883.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Xu, Yuan, Xiao Li, Hong-Fei Xiang, Qian-Qian Zhang, Xiao-Xiong Wang, Miao Yu, Long-Yun Hao e Yun-Ze Long. "Large-Scale Preparation of Polymer Nanofibers for Air Filtration by a New Multineedle Electrospinning Device". Journal of Nanomaterials 2020 (6 aprile 2020): 1–7. http://dx.doi.org/10.1155/2020/4965438.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

There are still some challenges for mass-scale production via electrospinning (e-spinning). For example, the cost of industrialized equipment is relatively expensive, and the subsequent maintenance costs are high. The reliability and stability of the production process are also one of the important challenges. The recycling of organic solvents and the volatilization of solvents not only affect the quality of nanofibers, but also causes environmental pollution. In this work, a new multineedle e-spinning device has been proposed for large-scale production of polymer nanofibers. The spinning solution is provided through the outside surface of the needle to avoid needle clogging problem, which is different from the traditional multineedle e-spinning. The successful preparation of thermoplastic polyurethane (TPU) nanofiber membrane with production rate ~50 g h-1 proves the feasibility of the device, which also can be used to prepare other functional nanofibers such as polyvinylidene fluoride (PVDF) and polyacrylonitrile (PAN). The prepared TPU nanofiber gauze has been characterized. The average fiber diameter was 145.3 nm. The surface of the sample was found to be uniform, and the water contact angle was 138.9°. The sample had gas permeability of 1500 mm s-1, excellent PM2.5 removal efficiency of 99.897%, and optical transparency of ~56%, indicating that the new device has a practical application perspective.

8

Alshabanah, Latifah Abdullah, Nada Omran, Bassma H. Elwakil, Moaaz T. Hamed, Salwa M. Abdallah, Laila A. Al-Mutabagani, Dong Wang et al. "Elastic Nanofibrous Membranes for Medical and Personal Protection Applications: Manufacturing, Anti-COVID-19, and Anti-Colistin Resistant Bacteria Evaluation". Polymers 13, n. 22 (18 novembre 2021): 3987. http://dx.doi.org/10.3390/polym13223987.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Herein, in the present work two series of thermoplastic polyurethane (TPU) nanofibers were manufactured using the electrospinning techniques with ZnO and CuO nanoparticles for a potential use as an elastic functional layer in antimicrobial applications. Percentages of 0%, 2 wt%, and 4 wt% of the nanoparticles were used. The morphological characterization of the electrospun TPU and TPU/NPs composites nanofibers were observed by using scanning electron microscopy to show the average fiber diameter and it was in the range of 90–150 nm with a significant impact of the nanoparticle type. Mechanical characterization showed that TPU nanofiber membranes exhibit excellent mechanical properties with ultra-high elastic properties. Elongation at break reached up to 92.5%. The assessment of the developed nanofiber membranes for medical and personal protection applications was done against various colistin resistant bacterial strains and the results showed an increment activity by increasing the metal oxide concentration up to 83% reduction rate by using TPU/ZnO 4% nanofibers against K. pneumoniae strain 10. The bacterial growth was completely eradicated after 8 and 16 h incubation with TPU/ZnO and TPU/CuO nanofibers, respectively. The nanofibers SEM study reveals the adsorption of the bacterial cells on the metal oxides nanofibers surface which led to cell lysis and releasing of their content. Finally, in vitro study against Spike S-protein from SARS-CoV-2 was also evaluated to investigate the potent effectiveness of the proposed nanofibers in the virus deactivation. The results showed that the metal oxide concentration is an effective factor in the antiviral activity due to the observed pattern of increasing the antibacterial and antiviral activity by increasing the metal oxide concentration; however, TPU/ZnO nanofibers showed a potent antiviral activity in relation to TPU/CuO.

9

Karlapudi, Mounika Chowdary, Mostafa Vahdani, Sheyda Mirjalali Bandari, Shuhua Peng e Shuying Wu. "A Comparative Study on the Effects of Spray Coating Methods and Substrates on Polyurethane/Carbon Nanofiber Sensors". Sensors 23, n. 6 (19 marzo 2023): 3245. http://dx.doi.org/10.3390/s23063245.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Thermoplastic polyurethane (TPU) has been widely used as the elastic polymer substrate to be combined with conductive nanomaterials to develop stretchable strain sensors for a variety of applications such as health monitoring, smart robotics, and e-skins. However, little research has been reported on the effects of deposition methods and the form of TPU on their sensing performance. This study intends to design and fabricate a durable, stretchable sensor based on composites of thermoplastic polyurethane and carbon nanofibers (CNFs) by systematically investigating the influences of TPU substrates (i.e., either electrospun nanofibers or solid thin film) and spray coating methods (i.e., either air-spray or electro-spray). It is found that the sensors with electro-sprayed CNFs conductive sensing layers generally show a higher sensitivity, while the influence of the substrate is not significant and there is no clear and consistent trend. The sensor composed of a TPU solid thin film with electro-sprayed CNFs exhibits an optimal performance with a high sensitivity (gauge factor ~28.2) in a strain range of 0–80%, a high stretchability of up to 184%, and excellent durability. The potential application of these sensors in detecting body motions has been demonstrated, including finger and wrist-joint movements, by using a wooden hand.

10

Ho, Wai K., Joseph H. Koo e Ofodike A. Ezekoye. "Thermoplastic Polyurethane Elastomer Nanocomposites: Morphology, Thermophysical, and Flammability Properties". Journal of Nanomaterials 2010 (2010): 1–11. http://dx.doi.org/10.1155/2010/583234.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Novel materials based on nanotechnology creating nontraditional ablators are rapidly changing the technology base for thermal protection systems. Formulations with the addition of nanoclays and carbon nanofibers in a neat thermoplastic polyurethane elastomer (TPU) were melt-compounded using twin-screw extrusion. The TPU nanocomposites (TPUNs) are proposed to replace Kevlar-filled ethylene-propylene-diene-monomer rubber, the current state-of-the-art solid rocket motor internal insulation. Scanning electron microscopy analysis was conducted to study the char characteristics of the TPUNs at elevated temperatures. Specimens were examined to analyze the morphological microstructure during the pyrolysis reaction and in fully charred states. Thermophysical properties of density, specific heat capacity, thermal diffusivity, and thermal conductivity of the different TPUN compositions were determined. To identify dual usage of these novel materials, cone calorimetry was employed to study the flammability properties of these TPUNs.

11

Gundogdu, N. A. Serhat, Yasin Akgul e Ali Kilic. "Optimization of centrifugally spun thermoplastic polyurethane nanofibers for air filtration applications". Aerosol Science and Technology 52, n. 5 (20 febbraio 2018): 515–23. http://dx.doi.org/10.1080/02786826.2018.1433813.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

12

AKIN, Ecem, Sibel DEMIROGLU, Elif ALYAMAÇ e Özgür SEYDİBEYOĞLU. "Elektro Çekim Yöntemi ile Haloysit Katkılı Biyo-Bazlı Termoplastik Poliüretan Nanolif Üretimi ve Karakterizasyonu". Tekstil ve Mühendis 27, n. 120 (30 dicembre 2020): 218–29. http://dx.doi.org/10.7216/1300759920202712001.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

In this study, it was aimed to produce biocomposite nanofibers by using electrospinning technique and to form biocomposite structure, bio-based thermoplastic polyurethane (BioTPU) and halloysite (HST) mineral obtained from natural sources were used. Electrospinning parameters have been optimized for the production of nanofibers with smooth morphology and the polymer solution with the most suitable parameter was determined. Different concentrations of HST filled BioTPU nanofibers were produced and the rheological behavior of the solutions was investigated with a rotational rheometer before electrospinning to observe the effects of halloysite on fiber morphology. Fourier transform infrared spectroscopy (FTIR) analysis was carried out to determine the chemical composition of acquired nanofibers, and scanning electron microscopy (SEM) was used to monitor surface morphologies. Contact angle measurements were carried out to observe the effects of halloysite on the hydrophilicity of nanofiber. According to rheology results, it has been found out that the solution viscosity, storage modulus (G') and loss modulus (G'') of halloysite increased up to a certain concentration (0.3 % HST), but later caused falls on viscosity. According to the results of FTIR analysis, there is no chemical bond between halloysite and BioTPU, but SEM images show that halloysite was added to the structure of nanofibers. It was also found that the halloysite added to the structure increased the fiber diameters and that the fiber cross-section was not uniformly distributed along the fiber axis. The results of contact angle analysis indicated that acquired nanofibers have hydrophobic surface and the added halloysite decreases contact angles of nanofibers.

13

Canbay-Gokce, Emine, Yasin Akgul, Ahmet Yakup Gokce, Cigdem Tasdelen-Yucedag, Ali Kilic e Ahmed Hassanin. "Characterization of solution blown thermoplastic polyurethane nanofibers modified with Szygium aromaticum extract". Journal of The Textile Institute 111, n. 1 (20 giugno 2019): 10–15. http://dx.doi.org/10.1080/00405000.2019.1631678.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

14

Dasdemir, Mehmet, Mehmet Topalbekiroglu e Ali Demir. "Electrospinning of thermoplastic polyurethane microfibers and nanofibers from polymer solution and melt". Journal of Applied Polymer Science 127, n. 3 (10 maggio 2012): 1901–8. http://dx.doi.org/10.1002/app.37503.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

15

He, Chao, Han Wang, Li Xiong Huang, Ping Wang e Wei Gao. "Study on Morphology Features and Mechanical Properties of Nanofibers Films Prepared by Different Composite Electrospinning Methods". Key Engineering Materials 841 (maggio 2020): 70–75. http://dx.doi.org/10.4028/www.scientific.net/kem.841.70.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Electrospinning is an important method for preparing nanofibers, which are highly promising for applications in a wide range of fields such as purification/filtration, photoelectric devices, battery separators, catalysis and tissue engineering. These applications often use composite materials and have specific requirements for mechanical properties. Therefore, how to get nanofibers films with ideal mechanical properties by changing the composite mode is an important process problem for the given two or more materials. Based on the far-field electrospinning, this study selected polyacrylonitrile (PAN) and thermoplastic polyurethane (TPU) to explore the differences of three composite methods: mixed spinning, multi-nozzle simultaneous spinning and superposition spinning. Three kinds of analysis can be seen in this study, which include morphology features, thickness measurement and mechanical properties of samples. Multi-nozzle simultaneous spinning has very limited changes. Mixed spinning and superposition spinning are beneficial to the improvement of nanofibers films morphology and mechanical properties. Among them, the composite films through superposition spinning are thinner.

16

Sattar, Rabia, Ayesha Kausar e Muhammad Siddiq. "Advances in thermoplastic polyurethane composites reinforced with carbon nanotubes and carbon nanofibers: A review". Journal of Plastic Film & Sheeting 31, n. 2 (20 maggio 2014): 186–224. http://dx.doi.org/10.1177/8756087914535126.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

17

Polat, Yusuf, Esra Serife Pampal, Elena Stojanovska, Ramazan Simsek, Ahmed Hassanin, Ali Kilic, Ali Demir e Safak Yilmaz. "Solution blowing of thermoplastic polyurethane nanofibers: A facile method to produce flexible porous materials". Journal of Applied Polymer Science 133, n. 9 (21 ottobre 2015): n/a. http://dx.doi.org/10.1002/app.43025.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

18

Mi, Hao-Yang, Max R. Salick, Xin Jing, Wendy C. Crone, Xiang-Fang Peng e Lih-Sheng Turng. "Electrospinning of unidirectionally and orthogonally aligned thermoplastic polyurethane nanofibers: Fiber orientation and cell migration". Journal of Biomedical Materials Research Part A 103, n. 2 (7 maggio 2014): 593–603. http://dx.doi.org/10.1002/jbm.a.35208.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

19

Wu, Zecheng, Zhijun Zhang, Xuling Song, Weiqing Peng, Xipo Zhao, Hui Zhao, Dongwu Liang, Chongxing Huang e Qingshan Duan. "A silver nanoparticles-polylactic acid microspheres/polylactic acid-thermoplastic polyurethane nanofibers hierarchical antibacterial film". Industrial Crops and Products 207 (gennaio 2024): 117773. http://dx.doi.org/10.1016/j.indcrop.2023.117773.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

20

Gholami, Ahmad, Homeira Emad Abdoluosefi, Elham Riazimontazer, Negar Azarpira, Mohamadali Behnam, Farzin Emami e Navid Omidifar. "Prevention of Postsurgical Abdominal Adhesion Using Electrospun TPU Nanofibers in Rat Model". BioMed Research International 2021 (28 dicembre 2021): 1–16. http://dx.doi.org/10.1155/2021/9977142.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Intra-abdominal adhesions following surgery are a challenging problem in surgical practice. This study fabricated different thermoplastic polyurethane (TPU) nanofibers with different average diameters using the electrospinning method. The conditions were evaluated by scanning electron microscopy (SEM), atomic force microscope (AFM), and Fourier transform infrared spectrometer (FTIR) analysis. A static tensile test was applied using a strength testing device to assess the mechanical properties of the electrospun scaffolds. By changing the effective electrospinning parameters, the best quality of nanofibers could be achieved with the lowest bead numbers. The electrospun nanofibers were evaluated in vivo using a rat cecal abrasion model. The macroscopic evaluation and the microscopic study, including the degree of adhesion and inflammation, were investigated after three and five weeks. The resultant electrospun TPU nanofibers had diameters ranging from about 200 to 1000 nm. The diameters and morphology of the nanofibers were significantly affected by the concentration of polymer. Uniform TPU nanofibers without beads could be prepared by electrospinning through reasonable control of the process concentration. These nanofibers’ biodegradability and antibacterial properties were investigated by weight loss measurement and microdilution methods, respectively. The purpose of this study was to provide electrospun nanofibers having biodegradability and antibacterial properties that prevent any adhesions or inflammation after pelvic and abdominal surgeries. The in vivo experiments revealed that electrospun TPU nanofibers reduced the degree of abdominal adhesions. The histopathological study confirmed only a small extent of inflammatory cell infiltration in the 8% and 10% TPU. Conclusively, nanofibers containing 8% TPU significantly decreased the incidence and severity of postsurgical adhesions, and it is expected to be used in clinical applications in the future.

21

Kotrotsos, Athanasios, Nikolaos Syrmpopoulos, Prokopios Gavathas, Sorina Moica e Vassilis Kostopoulos. "Development of High-Sensitivity Thermoplastic Polyurethane/Single-Walled Carbon Nanotube Strain Sensors through Solution Electrospinning Process Technique". Journal of Composites Science 8, n. 6 (6 giugno 2024): 213. http://dx.doi.org/10.3390/jcs8060213.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

In this study, nanofibers obtained through the electrospinning process are explored for strain-sensing applications. Thermoplastic polyurethane (TPU) flexible structures were fabricated using the solution electrospinning process (SEP) technique. Subsequently, these structures were nanomodified with single-walled carbon nanotubes (SWCNTs) through immersion into an ultrasonicated suspension containing 0.3 wt% SWCNTs. The nanomodification aimed to impart an electrically conductive network to the structures. Micro-tensile tests and electrical resistance measurements were conducted to characterize the apparent mechanical and electrical properties, respectively. The fabricated structures demonstrated potential as wearable strain sensors for monitoring changes in strain across various applications. The samples exhibited excellent performance, high sensitivity, outstanding mechanical properties, and a broad stretching range. Scanning electron microscopy (SEM) observations provided qualitative insights into the activated conductive pathways during operation.

22

Shehata, Nader, Remya Nair, Ishac Kandas, Nada Omran e Ahmed Hassanin. "Elastic Piezoelectric Nanofibers Mats for Acoustic Energy Harvesting". Materials Science Forum 1075 (30 novembre 2022): 19–25. http://dx.doi.org/10.4028/p-uday6z.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

One of the traditional clean-energy harvesting solutions is through transducing different mechanical stresses into electrical energy. Generally, the acoustic-to-electric energy conversion of still needs more research investigations to be applicable. In our work, we are targeting to fabricate elastic nanofibers mats via electrospinning method to be used for acoustic harvesting/sensing applications. The targeted mechanically-elastic nanocomposite includes polyvinylidene fluoride (PVDF), which is one of the most famous organic piezo materials, with blended thermoplastic polyurethane (TPU). As TPU supports higher mechanical allowed breaking strain. Then, the synthesized mat has been used as a target for mechanical stresses with resulted piezosensitivity of 667±220 mV/N. Then, the nanofibers mat has been targeted against acoustic signals with different amplitude and frequencies. It has been observed that the synthesized mats can detect or harvest acoustic signals and convert them into output electric voltage. According to acoustic sound input, the synthesized electrospun nanofibers detect output voltage up to 300 mV with increased input audible amplitude and frequency up to 6 kHz, where the harvested voltage has a saturation behaviour beyond that audible frequency. That can open the track for using such nanocomposites in energy harvesting applications from disposable facemasks, filters, and music/noise in different opened and closed areas.

23

Akduman, Cigdem, Işık Özgüney e E. Perrin Akcakoca Kumbasar. "Preparation and characterization of naproxen-loaded electrospun thermoplastic polyurethane nanofibers as a drug delivery system". Materials Science and Engineering: C 64 (luglio 2016): 383–90. http://dx.doi.org/10.1016/j.msec.2016.04.005.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

24

Zhao, Baobao, Xiaoming Qian, Yao Qian, Jintu Fan, Yan Feng, Yongchao Duo e Heng Zhang. "Preparation of high-performance microfiber synthetic leather base using thermoplastic polyurethane/sulfonated polysulfone electrospun nanofibers". Textile Research Journal 89, n. 14 (24 settembre 2018): 2813–20. http://dx.doi.org/10.1177/0040517518801154.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

25

Chen, Rui, Chen Huang, Qinfei Ke, Chuanglong He, Hongsheng Wang e Xiumei Mo. "Preparation and characterization of coaxial electrospun thermoplastic polyurethane/collagen compound nanofibers for tissue engineering applications". Colloids and Surfaces B: Biointerfaces 79, n. 2 (settembre 2010): 315–25. http://dx.doi.org/10.1016/j.colsurfb.2010.03.043.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

26

Cruz, Karina Ferreira Noronha, Daniela Maria Ducatti Formaggio, Dayane Batista Tada, Fernando Henrique Cristovan e Lilia Müller Guerrini. "Development of electroactive nanofibers based on thermoplastic polyurethane and poly(o-ethoxyaniline) for biological applications". Journal of Biomedical Materials Research Part A 105, n. 2 (9 novembre 2016): 601–7. http://dx.doi.org/10.1002/jbm.a.35928.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

27

Akduman, C., E. P. Akcakoca Kumbasar e I. Ozguney. "The comparative study of nursing pads by electrospun cellulose acetate, polyethylene oxide and thermoplastic polyurethane nanofibers". IOP Conference Series: Materials Science and Engineering 459 (7 dicembre 2018): 012029. http://dx.doi.org/10.1088/1757-899x/459/1/012029.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

28

Li, Ying, Guixin Cui e Yongchun Zeng. "New Method for a SEM-Based Characterization of Helical-Fiber Nonwovens". Polymers 14, n. 16 (18 agosto 2022): 3370. http://dx.doi.org/10.3390/polym14163370.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

The lack of tools particularly designed for the quantification of the fiber morphology in nonwovens, especially the multi-level structured fibers, is the main reason for the limited research studies on the establishment of realistic nonwoven structure. In this study, two polymers, cellulose acetate (CA) and thermoplastic polyurethane (TPU), which have different molecular flexibility, were chosen to produce nonwovens with helical nanofibers. Focusing on the nonwovens with helical fibers, a soft package was developed to characterize fiber morphologies, including fiber orientation, helix diameter, and curvature of helix. The novelty of this study is the proposal of a method for the characterization of nanofibrous nonwovens with special fiber shape (helical fibers) which can be used for curve fibers. The characterization results for the helical-fiber nonwoven sample and the nonwoven sample with straight fibers were compared and analyzed.

29

Elnabawy, Eman, Ahmed H. Hassanain, Nader Shehata, Anton Popelka, Remya Nair, Saifallah Yousef e Ishac Kandas. "Piezoelastic PVDF/TPU Nanofibrous Composite Membrane: Fabrication and Characterization". Polymers 11, n. 10 (10 ottobre 2019): 1634. http://dx.doi.org/10.3390/polym11101634.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Poly (vinylidene fluoride) nanofibers (PVDF NFs) have been extensively used in energy harvesting applications due to their promising piezoresponse characteristics. However, the mechanical properties of the generated fibers are still lacking. Therefore, we are presenting in this work a promising improvement in the elasticity properties of PVDF nanofibrous membrane through thermoplastic polyurethane (TPU) additives. Morphological, physical, and mechanical analyses were performed for membranes developed from different blend ratios. Then, the impact of added weight ratio of TPU on the piezoelectric response of the formed nanofibrous composite membranes was studied. The piezoelectric characteristics were studied through impulse loading testing where the electric voltage had been detected under applied mass weights. Piezoelectric characteristics were investigated further through a pressure mode test the developed nanofibrous composite membranes were found to be mechanically deformed under applied electric potential. This work introduces promising high elastic piezoelectric materials that can be used in a wide variety of applications including energy harvesting, wearable electronics, self-cleaning filters, and motion/vibration sensors.

30

Xing, Chenyang, Jipeng Guan, Zhouli Chen, Yu Zhu, Bowu Zhang, Yongjin Li e Jingye Li. "Novel multifunctional nanofibers based on thermoplastic polyurethane and ionic liquid: towards antibacterial, anti-electrostatic and hydrophilic nonwovens by electrospinning". Nanotechnology 26, n. 10 (17 febbraio 2015): 105704. http://dx.doi.org/10.1088/0957-4484/26/10/105704.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

31

Wang, Xue, Zhiping Feng, Gaoqiang Zhang, Luna Wang, Liang Chen, Jin Yang e Zhonglin Wang. "Flexible Sensors Array Based on Frosted Microstructured Ecoflex Film and TPU Nanofibers for Epidermal Pulse Wave Monitoring". Sensors 23, n. 7 (3 aprile 2023): 3717. http://dx.doi.org/10.3390/s23073717.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Recent advances in flexible pressure sensors have fueled increasing attention as promising technologies with which to realize human epidermal pulse wave monitoring for the early diagnosis and prevention of cardiovascular diseases. However, strict requirements of a single sensor on the arterial position make it difficult to meet the practical application scenarios. Herein, based on three single-electrode sensors with small area, a 3 × 1 flexible pressure sensor array was developed to enable measurement of epidermal pulse waves at different local positions of radial artery. The designed single sensor holds an area of 6 × 6 mm2, which mainly consists of frosted microstructured Ecoflex film and thermoplastic polyurethane (TPU) nanofibers. The Ecoflex film was formed by spinning Ecoflex solution onto a sandpaper surface. Micropatterned TPU nanofibers were prepared on a fluorinated ethylene propylene (FEP) film surface using the electrospinning method. The combination of frosted microstructure and nanofibers provides an increase in the contact separation of the tribopair, which is of great benefit for improving sensor performance. Due to this structure design, the single small-area sensor was characterized by pressure sensitivity of 0.14 V/kPa, a response time of 22 ms, a wide frequency band ranging from 1 to 23 Hz, and stability up to 7000 cycles. Given this output performance, the fabricated sensor can detect subtle physiological signals (e.g., respiration, ballistocardiogram, and heartbeat) and body movement. More importantly, the sensor can be utilized in capturing human epidermal pulse waves with rich details, and the consistency of each cycle in the same measurement is as high as 0.9987. The 3 × 1 flexible sensor array is employed to acquire pulse waves at different local positions of the radial artery. In addition, the time domain parameters including pulse wave transmission time (PTT) and pulse wave velocity (PWV) can be obtained successfully, which holds promising potential in pulse-based cardiovascular system status monitoring.

32

Hu, Qingxi, Caiping Su, Zhaoxiang Zeng, Haiguang Zhang, Rui Feng, Jiaxuan Feng e Shuai Li. "Fabrication of multilayer tubular scaffolds with aligned nanofibers to guide the growth of endothelial cells". Journal of Biomaterials Applications 35, n. 4-5 (1 luglio 2020): 553–66. http://dx.doi.org/10.1177/0885328220935090.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Aligned electrospun fibers used for the fabrication of tubular scaffolds possess the ability to regulate cellular alignment and relevant functional expression, with applications in tissue engineering. Despite significant progress in the fabrication of small-diameter vascular grafts (SDVGs) over the past decade, several challenges remain; one of the most problematic of these is the fabrication of aligned nanofibers for multilayer SDVGs. Furthermore, delamination between each layer is difficult to avoid during the fabrication of multilayer structures. This study introduces a new fabrication method for minute delamination four-layer tubular scaffolds (FLTSs) that consist of an interior layer with highly longitudinal aligned nanofibers, two middle layers composed of electrospun sloped and circumferentially aligned fibers, and an exterior layer comprising random fibers. These FLTSs are used to simulate the structures and functions of native blood vessels. Here, thermoplastic polyurethane (TPU)/polycaprolactone (PCL)/polyethylene glycol (PEG) were electrospun to fabricate FLTSs or tubular scaffolds with completely random fibers layer (RLTSs). The surface wettability of the TPU/PCL/PEG tubular scaffold was tested by water contact angle analysis. In particular, compared with RLTSs, FLTSs showed excellent mechanical properties, with higher circumferential and longitudinal tensile properties. Furthermore, the high viability of the human umbilical vein endothelial cells (HUVECs) on the FLTSs indicated the biocompatibility of the tubular scaffolds comparing to RLTSs. The aligned and random composite structure of the FLTSs are conducive to promoting the growth of HUVECs, and the cell adhesion and proliferation on these scaffolds was found to be superior to that on RLTSs. These results demonstrate that the fabricated FLTSs have the potential for application in vascular tissue regeneration and clinical arterial replacements.

33

Wu, Gu, Hou, Li, Ke e Xiao. "Hybrid Nanocomposites of Cellulose/Carbon-Nanotubes/Polyurethane with Rapidly Water Sensitive Shape Memory Effect and Strain Sensing Performance". Polymers 11, n. 10 (27 settembre 2019): 1586. http://dx.doi.org/10.3390/polym11101586.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

In this work, a fast water-responsive shape memory hybrid polymer based on thermoplastic polyurethane (TPU) was prepared by crosslinking with hydroxyethyl cotton cellulose nanofibers (CNF-C) and multi-walled carbon nanotubes (CNTs). The effect of CNTs content on the electrical conductivity of TPU/CNF-C/CNTs nanocomposite was investigated for the feasibility of being a strain sensor. In order to know its durability, the mechanical and water-responsive shape memory effects were studied comprehensively. The results indicated good mechanical properties and sensing performance for the TPU matrix fully crosslinked with CNF-C and CNTs. The water-induced shape fixity ratio (Rf) and shape recovery ratio (Rr) were 49.65% and 76.64%, respectively, indicating that the deformed composite was able to recover its original shape under a stimulus. The TPU/CNF-C/CNTs samples under their fixed and recovered shapes were tested to investigate their sensing properties, such as periodicity, frequency, and repeatability of the sensor spline under different loadings. Results indicated that the hybrid composite can sense large strains accurately for more than 103 times and water-induced shape recovery can to some extent maintain the sensing accuracy after material fatigue. With such good properties, we envisage that this kind of composite may play a significant role in developing new generations of water-responsive sensors or actuators.

34

Luo, Zhaoxia, Xiaolin Li, Suhe Zhao, Lianghua Xu e Li Liu. "Structure and Dielectric Properties of TPU Composite Filled with CNTs@PDA Nanofibers and MXene Nanosheets". Polymers 14, n. 11 (26 maggio 2022): 2157. http://dx.doi.org/10.3390/polym14112157.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Thermoplastic polyurethane (TPU) is a kind of dielectric elastomer (DE) which can behave as an actuator, altering thickness strain in response to electrical stimulation. The composites are made up of fillers with a very high dielectric constant that are spread in a polymer matrix. It is very difficult to obtain large deformation at low voltage. In this study, we made two-dimensional (2D) MXene nanosheets with excellent conductivity and one-dimensional (1D) polydopamine (PDA)-modified CNT fiber fillers. After that, TPU dielectric elastomer films made of MXene/CNTs or MXene/CNTs@PDA were prepared. The results showed that the dielectric constant and dielectric loss of TPU dielectric film including MXene/CNTs were much higher than that containing MXene/CNTs@PDA, although Young’s modulus and breakdown strength (Eb) were significantly lower. At the same time, these two types of dielectric films had a significantly higher dielectric constant and dielectric loss than pure TPU dielectric film, and their breakdown strength was significantly lower. The compatibility of CNTs@PDA fibers with the TPU matrix improves after PDA modification, and the dispersion of CNTs@PDA fibers improves, resulting in an increase in Young’s modulus. MXene with a two-dimensional nanosheet structure increases the breakdown strength of the TPU dielectric elastomer under the condition of the addition of a tiny quantity. To summarize, the dielectric constant, dielectric loss, Young’s modulus, and dielectric elastomer breakdown strength are mutually restrictive conditions, and the relationship between all parties must be balanced to obtain obvious deformation properties.

35

Cui, Zhixiang, Jixin Lin, Conghua Zhan, Jiahui Wu, Shuai Shen, Junhui Si e Qianting Wang. "Biomimetic composite scaffolds based on surface modification of polydopamine on ultrasonication induced cellulose nanofibrils (CNF) adsorbing onto electrospun thermoplastic polyurethane (TPU) nanofibers". Journal of Biomaterials Science, Polymer Edition 31, n. 5 (21 gennaio 2020): 561–77. http://dx.doi.org/10.1080/09205063.2019.1705534.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

36

Fallahiarezoudar, Ehsan, Mohaddeseh Ahmadipourroudposht, Noordin Mohd Yusof, Ani Idris e Nor Hasrul Akhmal Ngadiman. "3D Biofabrication of Thermoplastic Polyurethane (TPU)/Poly-l-lactic Acid (PLLA) Electrospun Nanofibers Containing Maghemite (γ-Fe2O3) for Tissue Engineering Aortic Heart Valve". Polymers 9, n. 11 (6 novembre 2017): 584. http://dx.doi.org/10.3390/polym9110584.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

37

He, Yue, Shun-Heng Jia, Cong Fang, Ling-Cao Tan, Sen Qin, Xiao-Chun Yin, Chul B. Park e Jin-Ping Qu. "Constructing synergistically strengthening-toughening 3D network bundle structures by stereocomplex crystals for manufacturing high-performance thermoplastic polyurethane nanofibers reinforced poly(lactic acid) composites". Composites Science and Technology 232 (febbraio 2023): 109847. http://dx.doi.org/10.1016/j.compscitech.2022.109847.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

38

Chen, Xiao, Yuan Yao, Suihong Liu e Qingxi Hu. "An integrated strategy for designing and fabricating triple-layer vascular graft with oriented microgrooves to promote endothelialization". Journal of Biomaterials Applications 36, n. 2 (12 marzo 2021): 297–310. http://dx.doi.org/10.1177/08853282211001006.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Compared with native blood vessels and existing vascular grafts, design and manufacture of vascular grafts with a three-dimensional topological structure is a key to induce cells and tissue growth, which remains an essential issue in both tissue engineering and regenerative medicine. This study sought to develop a novel triple-layer vascular graft (TLVG) with oriented microgrooves to investigate the mechanical property and endothelialization. The TLVGs were composed of electrospun Poly-ε-caprolactone (PCL)/thermoplastic polyurethane (TPU) as the inner layer, albumen/sodium alginate (SA) hydrogel as the middle layer, and electrospun PCL/TPU as the outer layer. In detail, a cylindrical sacrificial template was designed and printed using polyvinyl alcohol (PVA), served as the electrospinning receiving platform to form the oriented microgrooves in the inner layer of TLVGs. The highly elastic albumen/SA hydrogel and PCL/TPU nanofibers were able to simulate the elastin in blood vessels. In addition, the introduction of the albumen/SA hydrogel layer not only solves the leakage problem of a porous vascular graft but also improves the wettability of the scaffolds. The physicochemical properties and biological characteristics of TLVGs were evaluated by tensile testing, Surface wettability test, Fourier transform-infrared spectroscopy (FTIR) measurement, Live-Dead cell staining assay, and CCK-8 assay. Especially, the oriented microgrooves on the inner surface of the TLVGs can promote human umbilical vein endothelial cells (HUVECs) directed growth and migration in favor of endothelialization. All results showed that the fabricated TLVGs with excellent physicochemical properties and biocompatibility has great potential in clinic application.

39

Alshabanah, Latifah Abdullah, Mohamed Hagar, Laila A. Al-Mutabagani, Ghada M. Abozaid, Salwa M. Abdallah, Nader Shehata, Hoda Ahmed e Ahmed H. Hassanin. "Hybrid Nanofibrous Membranes as a Promising Functional Layer for Personal Protection Equipment: Manufacturing and Antiviral/Antibacterial Assessments". Polymers 13, n. 11 (28 maggio 2021): 1776. http://dx.doi.org/10.3390/polym13111776.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

In this research work, nanofibrous hybrids are manufactured, characterized, and assessed as active antiviral and antibacterial membranes. In more detail, both polyvinyl alcohol (PVA) and thermoplastic polyurethane (TPU) nanofibrous (NF) membranes and their composites with embedded silver nanoparticles (Ag NPs) are manufactured by an electrospinning process. Their morphological structures have been investigated by a scanning electron microscope (SEM) which revealed a homogenous distribution and almost beads-free fibers in all manufactured samples. Characterization with spectroscopic tools has been performed and proved the successful manufacturing of Ag-incorporated PVA and TPU hybrid nanofibers. The crystalline phase of the nanofibers has been determined using an X-ray diffractometer (XRD) whose patterns showed their crystalline nature at an angle value (2θ) of less than 20°. Subsequent screening of both antiviral and antibacterial potential activities of developed nanohybrid membranes has been explored against different viruses, including SARS-Cov-2 and some bacterial strains. As a novel approach, the current work highlights potential effects of several polymeric hybrids on antiviral and antibacterial activities particularly against SARS-Cov-2. Moreover, two types of polymers have been tested and compared; PVA of excellent biodegradable and hydrophilic properties, and TPU of excellent mechanical, super elasticity, hydrophobicity, and durability properties. Such extreme polymers can serve a wide range of applications such as PPE, filtration, wound healing, etc. Consequently, assessment of their antiviral/antibacterial activities, as host matrices for Ag NPs, is needed for different medical applications. Our results showed that TPU-Ag was more effective than PVA-Ag as HIV-1 antiviral nanohybrid as well as in deactivating spike proteins of SARS-Cov-2. Both TPU-Ag and PVA-Ag nanofibrous membranes were found to have superior antimicrobial performance by increasing Ag concentration from 2 to 4 wt.%. Additionally, the developed membranes showed acceptable physical and mechanical properties along with both antiviral and antibacterial activities, which can enable them to be used as a promising functional layer in Personal Protective Equipment (PPE) such as (surgical gowns, gloves, overshoes, hair caps, etc.). Therefore, the developed functional membranes can support the decrease of both coronavirus spread and bacterial contamination, particularly among healthcare professionals within their workplace settings.

40

Fallahiarezoudar, Ehsan, Mohaddeseh Ahmadipourroudposht, Ani Idris e Noordin Mohd Yusof. "Optimization and development of Maghemite (γ-Fe2O3) filled poly-l-lactic acid (PLLA)/thermoplastic polyurethane (TPU) electrospun nanofibers using Taguchi orthogonal array for tissue engineering heart valve". Materials Science and Engineering: C 76 (luglio 2017): 616–27. http://dx.doi.org/10.1016/j.msec.2017.03.120.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

41

Wu, Sijia, Longhe Yang e Junde Chen. "Preparation and Characterization of Tilapia Collagen-Thermoplastic Polyurethane Composite Nanofiber Membranes". Marine Drugs 20, n. 7 (30 giugno 2022): 437. http://dx.doi.org/10.3390/md20070437.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Marine collagen is an ideal material for tissue engineering due to its excellent biological properties. However, the limited mechanical properties and poor stability of marine collagen limit its application in tissue engineering. Here, collagen was extracted from the skin of tilapia (Oreochromis nilotica). Collagen-thermoplastic polyurethane (Col-TPU) fibrous membranes were prepared using tilapia collagen as a foundational material, and their physicochemical and biocompatibility were investigated. Fourier transform infrared spectroscopy results showed that thermoplastic polyurethane was successfully combined with collagen, and the triple helix structure of collagen was retained. X-ray diffraction and differential scanning calorimetry results showed relatively good compatibility between collagen and TPU.SEM results showed that the average diameter of the composite nanofiber membrane decreased with increasing thermoplastic polyurethane proportion. The mechanical evaluation and thermogravimetric analysis showed that the thermal stability and tensile properties of Col-TPU fibrous membranes were significantly improved with increasing TPU. Cytotoxicity experiments confirmed that fibrous membranes with different ratios of thermoplastic polyurethane content showed no significant toxicity to fibroblasts; Col-TPU fibrous membranes were conducive to the migration and adhesion of cells. Thus, these Col-TPU composite nanofiber membranes might be used as a potential biomaterial in tissue regeneration.

42

Poorvisha, R., S. P. Suriyaraj, P. Thavamani, Ravi Naidu, Mallavarapu Megharaj, Amitava Bhattacharyya e R. Selvakumar. "Synthesis and characterisation of 3-dimensional hydroxyapatite nanostructures using a thermoplastic polyurethane nanofiber sacrificial template". RSC Advances 5, n. 118 (2015): 97773–80. http://dx.doi.org/10.1039/c5ra18593a.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

43

Špírková, Milena, Annamária Duszová, Rafał Poręba, Jana Kredatusová, Radovan Bureš, Mária Fáberová e Miroslav Šlouf. "Thermoplastic polybutadiene-based polyurethane/carbon nanofiber composites". Composites Part B: Engineering 67 (dicembre 2014): 434–40. http://dx.doi.org/10.1016/j.compositesb.2014.08.009.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

44

Akduman, Çiğdem, Işık Özgüney e E. Perrin Akçakoca Kumbasar. "Electrospun Thermoplastic Polyurethane Mats Containing Naproxen– Cyclodextrin Inclusion Complex". Autex Research Journal 14, n. 4 (1 dicembre 2014): 239–46. http://dx.doi.org/10.2478/aut-2014-0024.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Abstract Incorporation of cyclodextrins (CDs) into electrospun nanofibrous materials can be considered as potential candidates for functional medical textile applications. Naproxen (NAP) is a type of non-steroidal anti-inflammatory drug commonly administered for the treatment of pain, inflammation and fever. Drug-inclusion complex formation with CDs is an approach to improve the aqueous solubility via molecular encapsulation of the drug within the cavity of the more soluble CD molecule. In this study, NAP or different NAP-CD inclusion complexes loaded nanofibres were successfully produced through electrospinning and characterised. The inclusion complex loaded mats exhibited significantly faster release profiles than NAP-loaded thermoplastic polyurethane (TPU) mats. Overall, NAP-inclusion complex loaded TPU electrospun nanofibres could be used as drug delivery systems for acute pain treatments since they possess a highly porous structure that can release the drug immediately.

45

Emad Abdoluosefi, Homeira, e Gholamreza Honarasa. "Fabrication of polyurethane and thermoplastic polyurethane nanofiber by controlling the electrospinning parameters". Materials Research Express 4, n. 10 (24 ottobre 2017): 105308. http://dx.doi.org/10.1088/2053-1591/aa9191.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

46

Liu, Chunhui, Xi Liao, Weili Shao, Fan Liu, Bin Ding, Gaihuan Ren, Yanyan Chu e Jianxin He. "Hot-melt Adhesive Bonding of Polyurethane/Fluorinated Polyurethane/Alkylsilane-Functionalized Graphene Nanofibrous Fabrics with Enhanced Waterproofness, Breathability, and Mechanical Properties". Polymers 12, n. 4 (6 aprile 2020): 836. http://dx.doi.org/10.3390/polym12040836.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Waterproof-breathable (WB) materials with outstanding waterproofness, breathability, and mechanical performance are critical in diverse consumer applications. Electrospun nanofibrous membranes with thin fiber diameters, small pore sizes, and high porosity have attracted significant attention in the WB fabric field. Hot-press treatment technology can induce the formation of inter-fiber fusion structures and hence improve the waterproofness and mechanical performance. By combining electrospinning and hot-press treatment technology, polyurethane/fluorinated polyurethane/thermoplastic polyurethane/alkylsilane-functionalized graphene (PU/FPU/TPU/FG) nanofiber WB fabric was fabricated. Subsequently, the morphologies, porous structure, hydrostatic pressure, water vapor transmission rate (WVTR), and stress–strain behavior of the nanofiber WB fabric were systematically investigated. The introduction of the hydrophobic FG sheet structure and the formation of the inter-fiber fusion structure greatly improved not only the waterproofness but also the mechanical performance of the nanofiber WB fabric. The optimized PU/FPU/TPU-50/FG-1.5 WB fabric exhibited an excellent comprehensive performance: a high hydrostatic pressure of 80.4 kPa, a modest WVTR of 7.6 kg m−2 d−1, and a robust tensile stress of 127.59 MPa, which could be used to achieve various applications. This work not only highlights the preparation of materials, but also provides a high-performance nanofiber WB fabric with huge potential application prospects in various fields.

47

Xia, Yong, Lifen He, Jundan Feng, Sijun Xu, Lirong Yao e Gangwei Pan. "Waterproof and Moisture-Permeable Polyurethane Nanofiber Membrane with High Strength, Launderability, and Durable Antimicrobial Properties". Nanomaterials 12, n. 11 (25 maggio 2022): 1813. http://dx.doi.org/10.3390/nano12111813.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Nanofiber membrane has high biological protection function because of its good waterproof and moisture permeability properties. However, this membrane usually lacks active antimicrobial properties, limiting the application in reusable bioprotective textiles. Herein, waterborne polyurethane-capped Ag nanoparticles (AgNPs) were synthesized by reducing silver nitrate in water by sodium borohydride in the presence of polyurethane. AgNP-embedded thermoplastic urethane (TPU) nanofiber membrane was prepared by electrospinning a mixed solution of AgNPs and TPU. As-prepared membranes with Ag content of 50–300 mg·kg−1 have an average diameter of 0.75, 0.64, and 0.63 μm and good fiber uniformity. The doping of AgNP-embedded nanomembrane showed increased breaking force probably because of the induced crystallization effect. Test results showed that as-prepared TPU nanofiber membrane with silver content as low as 100 mg·kg−1 showed good washing resistance. The antibacterial rates of E. coli and S. aureus remained 99.99% with 50 times of soaping or chlorine washing. The corresponding waterproof and moisture permeability properties of nanofiber membrane with a thickness of 0.1 mm remained nearly unchanged, i.e., moisture permeability of around 2600 g·m−2 per 24 h and the hydrostatic pressure resistance of around 400 Pa after 50 times of soaping or chlorine washing.

48

Wang, Xiang, Haochen Shi, Zaibin Pan, Jiaxin Jiang, Shufan Li, Runyang Zhang, Wenhai Liao, Gaofeng Zheng e Wenwang Li. "Equipment develop and experiment study of the synchronization of electrospinning and electrospray". Journal of Physics: Conference Series 2740, n. 1 (1 aprile 2024): 012032. http://dx.doi.org/10.1088/1742-6596/2740/1/012032.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Abstract High-performance multi-functional nanomaterials have broad applications in various industrial fields. The assembling of nanofibers and nanoparticles prepared by electrospinning and electrospray is a typical structure for the functional combination of multi-materials. However, due to different solution properties and processing parameters, as well as the simultaneous mutual interferences, the controlling of the synchronization of electrospinning and electrospray technology is in an urgent demand. In this paper, an equipment was developed to realize the synchronization of electrospinning and electrospray technology, and multi-functional nanomaterials combining nanofibers and nanoparticles was achieved. Then, thermoplastic polyurethanes (TPU)/grapheneoxide (GO) and poly(lactic acid) PLA/polyaniline (PANI) membrane was prepared based on the self-developed equipment, verifying the process of the synchronization of electrospinning and electrospray.

49

Barick, A. K., e D. K. Tripathy. "Preparation and characterization of carbon nanofiber reinforced thermoplastic polyurethane nanocomposites". Journal of Applied Polymer Science 124, n. 1 (10 ottobre 2011): 765–80. http://dx.doi.org/10.1002/app.35066.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

50

Powers, Daniel S., Richard A. Vaia, Hilmar Koerner, Jennifer Serres e Peter A. Mirau. "NMR Characterization of Low Hard Segment Thermoplastic Polyurethane/Carbon Nanofiber Composites". Macromolecules 41, n. 12 (giugno 2008): 4290–95. http://dx.doi.org/10.1021/ma8002483.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Articoli di riviste sul tema "Thermoplastic polyurethane nanofibers"

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili