scholarly journals Influence of Characteristics of Thermoplastic Polyurethane on Graphene-Thermoplastic Polyurethane Composite Film

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 129
Author(s):  
Zhi-Min Zhou ◽  
Ke Wang ◽  
Kai-wen Lin ◽  
Yue-Hui Wang ◽  
Jing-Ze Li
Keyword(s):  
Electrical Conductivity ◽  
Composite Film ◽  
Thermoplastic Polyurethane ◽  
Tape Casting ◽  
Composite Films ◽  
Casting Process ◽  
Melting Points ◽  
Polyurethane Composite ◽  
Blending Method ◽  
Functional Fillers

Graphene-thermoplastic polyurethane (G-TPU) composite films were fabricated by traditional blending method and tape casting process with commercial graphene sheets as functional fillers and TPU masterbatches of four different melting points as matrix, respectively. The effects of matrix on the distribution of graphene, the electrical conductivity, and infrared (IR) light thermal properties of the G-TPU composite films were investigated. The experimental results reveal that the characteristics of TPU has little influence on the electrical conductivity of the G-TPU composite films, although the four TPU solutions have different viscosities. However, under the same graphene mass content, the thermal conductivity of four G-TPU composite films with different melting points is significantly different. The four kinds of G-TPU composite films have obvious infrared (IR) thermal effect. There is little difference in the temperatures between the composite films prepared by TPU with melting a point of 100 °C, 120 °C, and 140 °C, respectively; however, when the content of graphene is less than 5 wt%, the temperature of the composite film prepared by TPU with a melting point of 163 °C is obviously lower than that of the other three composite films. The possible reason for this phenomenon is related to the structure of TPU.

Flexible electrothermal polymer film based on reduced graphene oxide–water polyurethane

2020 ◽  
Vol 34 (25) ◽  
pp. 2050265 ◽  
Author(s):  
Ke Wang ◽  
Zhimin Zhou ◽  
Yuehui Wang
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Composite Film ◽  
Reduced Graphene Oxide ◽  
Rapid Heating ◽  
Tape Casting ◽  
Composite Films ◽  
Low Input ◽  
Reduced Graphene

In this paper, waterborne polyurethane (WPU) conductive films incorporated with reduced graphene oxide (RGO) as conductive fillers were prepared by solution blending and tape casting method. The electrical conductivity, thermal conductivity and microstructures of the composite films were systematically investigated. The experimental results demonstrate that the electrical conductivity and thermal conductivity of the RGO–WPU composite films first increased then decreased with the increase of the RGO content. The resistivity of composite film with 7% RGO reaches to the smallest that is about [Formula: see text], and the thermal conductivity of the composite film with 7% graphene was about 0.29 W.m.K[Formula: see text], which an increase of 70% compared with pure WPU. The electrical conductivity of the composite film decreased with the increase of the original concentration of WPU solution and thickness of the composite film. As film heater, the composite film displayed effective and rapid heating at low input voltages owing to the good conductivity. With an input voltage was in the range of 10–24 V, the film took less than 30s to reach a steady-state temperature, demonstrating the fast response of the composite film heater and suitable for applications in the field of the fast temperature switching with low input voltages as flexible electrothermal heater.

A reliable and highly conductive carbon nanotube/thermoplastic polyurethane composite with an enhanced segregated structure for electrically driven heater applications

2020 ◽  
Vol 8 (26) ◽  
pp. 8814-8822
Author(s):  
Wen-Jin Sun ◽  
Chang-Ge Zhou ◽  
Li-Chuan Jia ◽  
Yue-Yi Wang ◽  
Yun-Peng Zhang ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Thermoplastic Polyurethane ◽  
Electrical Heating ◽  
Heating Performance ◽  
Polyurethane Composite ◽  
Segregated Structure

The excellent stabilities of electrical conductivity and electrical heating performance after repeated processing was realized by enhanced segregated structure.

scholarly journals Copper-Polyurethane Composite Materials: Particle Size Effect on the Physical-Chemical and Antibacterial Properties

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1934
Author(s):  
Cristian Miranda ◽  
Johanna Castaño ◽  
Emky Valdebenito-Rolack ◽  
Felipe Sanhueza ◽  
Rody Toro ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Composite Materials ◽  
Thermoplastic Polyurethane ◽  
Antibacterial Properties ◽  
Copper Particle ◽  
Copper Particles ◽  
Polyurethane Composite ◽  
Natural Concentration ◽  
Blending Method

In this work, thermoplastic polyurethane (TPU) composites incorporated with 1.0 wt% Cu particles were synthesized by the melt blending method. The effect of the incorporated copper particle size on the antibacterial, thermal, rheological, and mechanical properties of TPU was investigated. The obtained results showed that (i) the addition of copper particles increased the thermal and mechanical properties because they acted as co-stabilizers of polyurethane (PU) (ii) copper nanoparticles decreased the viscosity of composite melts, and (iii) microparticles > 0.5 µm had a tendency to easily increase the maximum torque and formation of agglomerates. SEM micrographics showed that a good mixture between TPU and copper particles was obtained by the extrusion process. Additionally, copper-TPU composite materials effectively inhibited the growth of the Gram-negative Escherichia coli and the Gram-positive Staphylococcus aureus. Considering that the natural concentration of copper in the blood is in the range of 0.7–0.12 mg/L and that the total migration value of copper particles from TPU was 1000 times lower, the results suggested that TPU nanocomposites could be adequately employed for biomedical applications without a risk of contamination.

Visible Light Photocatalytic Degradation PVC/B-F Co-Doped TiO2 Composite

2011 ◽  
Vol 239-242 ◽  
pp. 2015-2018 ◽  
Author(s):  
Zhong Hou Zhang ◽  
Guang Xiu Cao ◽  
Ying Ying Li ◽  
Xiao Yan Wei
Keyword(s):  
Weight Loss ◽  
Visible Light ◽  
Composite Film ◽  
Photocatalytic Degradation ◽  
Solid Phase ◽  
Sol Gel ◽  
Tape Casting ◽  
Composite Films ◽  
Xenon Lamp ◽  
Visible Light Photocatalytic

The B-F codoped nano-TiO2 powders were prepared by the sol-gel method. The surface of powders was modified by stearic acid. The visible light photodegradable PVC/B-F codoped nano-TiO2 composite films were prepared by tape casting processing. Solid-phase visible light photocatalytic degradation of the films were investigated with a 1000W xenon lamp and a ZJB 420 filter glass was used to cut off light of wavelength <420 nm. The weight-loss measurement, SEM, DSC of films were detected. Results showed that the weight loss of PVC/B-F codoped nano-TiO2 composite film (2%TiO2 w/w) is 16.9% after 120h UV irradiation, which is notably higher than that of both the pure PVC film and the PVC/nano-TiO2 composite film. Glass transition (Tg) is appeared for samples after 72h irradiation, and the Tg of PVC/B-F codoped nano-TiO2 composite film is the lowest of all samples. The surface of PVC/B-F codoped nano-TiO2 composite film was destroyed obviously by SEM photo.

Fabrication and Electrical Characteristics of Graphite/Carbon Nanotube/Polyvinyl Butyral Composite Film via Tape-Casting and Heat-Treatment

2015 ◽  
Vol 15 (10) ◽  
pp. 8055-8061
Author(s):  
Min-Young Kim ◽  
Seung-Woo Choi ◽  
Seong Jae Boo ◽  
Jong-Ho Lee ◽  
Hee Sook Noh ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Composite Film ◽  
Bending Strength ◽  
Tape Casting ◽  
Composite Films ◽  
Sheet Thickness ◽  
Conductive Filler ◽  
Polyvinyl Butyral ◽  
Dispersion Property ◽  
Spherical Graphite

Composite stacking films, which can be applied as the bipolar plates of redox flow batteries, were fabricated via a tape-casting process that used slurry of graphite, CNT, and resin materials. The slurry was made of 25~45 wt% conductive filler (graphite, CNT) and 55~75 wt% polyvinyl butyral (PVB) binder solution (binder, dispersant, plasticizer, and solvent). The sheet thickness of the composite films was controlled to 70~150 μm, and composite films of about 1 mm in thickness were also fabricated by stacking and laminating the sheet film, including the conductive filler of above 85 wt%. The effects of the shape and physical properties of the graphite were investigated with regard to the dispersion behavior and flow of the slurry on the carrier film of the tape-casting device. As a result, the acicular graphite showed a good dispersion property with the resin of the PVB binder, as compared to spherical graphite. The composite film with acicular graphite showed a lower resistivity than that of a film with spherical graphite. Furthermore, the effects of adding a small amount of CNT and the heat-treatment to the composite stacking film were also studied. Finally, the composite film showed an electrical characteristic of below 50 mΩ·cm and a high bending strength of above 20 MPa.

scholarly journals Improvement of the electromechanical properties of thermoplastic polyurethane composite by ionic liquid modified multiwall carbon nanotubes

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 166-178
Author(s):  
Qianwei Xu ◽  
Weijia Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Constant ◽  
Ionic Liquid ◽  
Elastic Modulus ◽  
Thermoplastic Polyurethane ◽  
Multiwall Carbon Nanotubes ◽  
Electromechanical Properties ◽  
Polyurethane Composite ◽  
Blending Method ◽  
Multiwall Carbon

Abstract Carbon nanotubes (CNTs) were non-covalently modified by two categories of ionic liquids (ILs), including 1-vinyl-3-ethylimidazole bromide (VEIMBr) and 1-vinyl-3-hexylimidazole bromide (VHIMBr) in the ratio of 1:1 and 1:4, respectively. The surface interaction between CNTs and ILs was well-characterized by FTIR, Raman spectra, XPS, etc. Thermoplastic polyurethane (TPU) containing different amounts of CNTs/ILs was fabricated by melting blending method. TPU-CNTs/ILs composites exhibited simultaneously enhanced electromechanical properties with improved dielectric constant and lowered elastic modulus. The electromechanical sensitivity of sample TPU-3CNT/12VHIMBr increased by approximately 45 times in comparison with that of pure TPU at 200 Hz. Besides, improved dispersion of CNTs/ILs in the TPU matrix was also exhibited.

scholarly journals Optimizing Processing Parameters and Fiber Size for Kenaf Fiber Reinforced Thermoplastic Polyurethane Composite

2011 ◽  
Vol 471-472 ◽  
pp. 297-302 ◽  
Author(s):  
Y.A. El-Shekeil ◽  
S.M. Sapuan ◽  
E.S. Zainudin ◽  
Abdan Khalina
Keyword(s):  
Impact Strength ◽  
Thermoplastic Polyurethane ◽  
Processing Parameters ◽  
Short Fiber ◽  
Mean Value ◽  
Hibiscus Cannabinus ◽  
Polyurethane Composite ◽  
Blending Method ◽  
Fiber Size ◽  
Internal Mixer

In this study, composite of Themoplastic polyurethane (TPU) reinforced with short fiber (Hibiscus Cannabinus) kenaf (KF) were prepared via melt blending method using Haake Polydrive R600 internal mixer. Effect of various processing temperatures, times and speeds on tensile strength was studied, together with effect of various fiber sizes on tensile, flexural properties and impact strength. Optimum blending parameters were 190°C, 11 min, and 40 rpm for temperature, time and speed, respectively. Using the optimum processing parameters TPU-KF composites with different fiber sizes were prepared. Composite sheets were prepared by hot press machine at 190 °C for 10 min. Five samples were cut from the composite sheet. Mean value was taken for each composite according to ASTM standards. Tensile and flexural strength were best for fibers between 125-300 micron. Impact strength showed an increasing trend with increasing fiber size.

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