Electrostrictive thermoplastic polyurethane-based nanocomposites filled with carboxyl-functionalized multi-walled carbon nanotubes (MWCNT-COOH): Properties and improvement of electromechanical activity

2013 ◽  
Vol 85 ◽  
pp. 23-28 ◽  
Author(s):  
K. Wongtimnoi ◽  
B. Guiffard ◽  
A. Bogner-Van de Moortèle ◽  
L. Seveyrat ◽  
J.-Y. Cavaillé
Keyword(s):  
Carbon Nanotubes ◽  
Thermoplastic Polyurethane ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Compression Moulding of Thermoplastic Nanocomposites Filled with MWCNT

2017 ◽  
Vol 25 (8) ◽  
pp. 611-620 ◽  
Author(s):  
Fabrizio Quadrini ◽  
Denise Bellisario ◽  
Loredana Santo ◽  
Felicia Stan ◽  
Fetecau Catalin
Keyword(s):  
Carbon Nanotubes ◽  
Differential Scanning Calorimetry ◽  
Filler Content ◽  
Thermoplastic Polyurethane ◽  
Mechanical Tests ◽  
Compression Moulding ◽  
Scanning Calorimetry ◽  
Melt Mixing ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Multi-walled carbon-nanotubes (MWCNTs) were melt-mixed with three different thermoplastic matrices (polypropylene, PP, polycarbonate, PC, and thermoplastic polyurethane, TPU) to produce nanocomposites with three different filler contents (1, 3, and 5 wt.%). Initial nanocomposite blends (in the shape of pellets) were tested under differential scanning calorimetry to evaluate the effect of the melt mixing stage. Nanocomposite samples were produced by compression moulding in a laboratory-scale system, and were tested with quasi-static (bending, indentation), and dynamic mechanical tests as well as with friction tests. The results showed the effect of the filler content on the mechanical and functional properties of the nanocomposites. Compression moulding appeared to be a valuable solution to manufacture thermoplastic nanocomposites when injection moulding leads to loss of performance. MWCNT-filled thermoplastics could be used also for structural and functional uses despite, the present predominance of electrical applications.

Preparation and Characterization of Polyurethane/Multi-Walled Carbon Nanotubes Composites with Multi Functional Performance

2008 ◽  
Vol 47-50 ◽  
pp. 765-768 ◽  
Author(s):  
Feng Dan Jiang ◽  
Guo Hua Hu ◽  
Li Qun Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Functional Performance ◽  
Thermoplastic Polyurethane ◽  
Functional Materials ◽  
Nano Composites ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Higher Temperature ◽  
Walled Carbon Nanotubes

A melt blending process was employed to prepare nano-composites based on thermoplastic polyurethane (TPU) and multi-walled carbon nanotubes (MWNT). The content of MWNT filled in TPU was increased till 40phr (parts per hundreds of rubber). Scanning electron microscope (SEM) and transmission electron microscope (TEM) showed that the unmodified MWNT were dispersed uniformly in the TPU matrix beyond expectation. Dynamic mechanical thermal analysis (DMTA) test demonstrated that the nano-composites possessed greatly increased modulus, and the flowing temperature moved to higher temperature with increasing MWNT content. Moreover, the nano-composites exhibited improved wear resistance, evidently increased thermal conductivity, and prominently raised electrical conductivity that might mean the TPU/MWNT nano-composites have potential application as multi-functional materials.

Rheological Properties of Thermoplastic Polyurethane/Multi-Walled Carbon Nanotube Nanocomposites

2016 ◽  
Vol 699 ◽  
pp. 18-24
Author(s):  
Ionut Laurentiu Sandu ◽  
Razvan Rosculet ◽  
Catalin Fetecau
Keyword(s):  
Carbon Nanotubes ◽  
Rheological Behavior ◽  
Flow Behavior ◽  
Thermoplastic Polyurethane ◽  
Polymer Processing ◽  
Effect Of Temperature ◽  
Capillary Rheometry ◽  
Multi Walled Carbon Nanotubes ◽  
Processing Techniques ◽  
Walled Carbon Nanotubes

Carbon nanotubes offer the possibility of substantial improvements in the properties of polymer-based composites. However, adding carbon nanotubes increases the viscosity and makes the composites more difficult to process. Consequently, understanding the rheological behavior of nanocomposites is important from both the theoretical and industrial points of view. In the present work, rheological behavior of thermoplastic polyurethane filled with various amounts (1, 3 and 5 wt.%) of multi-walled carbon nanotubes was investigated by capillary rheometry. In this regard, the melt flow behavior of the nanocomposite was measured using a capillary rheometer with a die length-diameter ratio of 30:1, 20:1 and 10:1. In order to investigate the effect of temperature on viscosity, the tests were carried out in the temperature range of 180 to 210°C. The shear rate examined between 100 and 5000 s-1, cover the shear experienced during most polymer processing techniques. The Bagley and Weissenberg-Rabinowitsch correction was performed to determine the real viscosity of the nanocomposites; moreover, the Cross viscosity model coefficients were determined.

An Analysis of Interfacial Adhesion Between TPU/MWCNT Composites and ABS Substrate by Over Injection Molding

2016 ◽  
Author(s):  
Catalin Fetecau ◽  
Felicia Stan ◽  
Nicoleta Violeta Cristea ◽  
Laurentiu Ionut Sandu
Keyword(s):  
Carbon Nanotubes ◽  
Injection Molding ◽  
Flow Behavior ◽  
Thermoplastic Polyurethane ◽  
Acrylonitrile Butadiene Styrene ◽  
Injection Molding Process ◽  
Molding Process ◽  
Melt Temperature ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this work, the advantages of Thermoplastic Polyurethane (TPU) filled with multi-walled carbon nanotubes (MWCNTs) were combined with those of the over injection molding process in order to obtain two-component (2k) structures with very different but high mechanical and electrical properties. TPU/MWCNT composites with different MWCNTs wt.% were over-molded onto Acrylonitrile Butadiene Styrene (ABS) substrates, under different processing conditions, and the adhesion was assessed by T-peel tests at room temperature. Since adhesion is also related to flow behavior, the rheological properties were studied with a capillary rheometer at shear rates similar to those of the injection molding process (102∼104s−1). Experimental results indicated that the most effective way to control the adhesion between the ABS substrate and the over-molded TPU/MWCNT composite is to increase the melt temperature. The addition of carbon nanotubes improves adhesion in the vicinity of 0.5 wt.% MWCNTs.

Multi-walled Carbon Nanotubes Penetrate into Plant Cells and Affect the Growth of Onobrychis arenaria Seedlings

Acta Naturae ◽  
2011 ◽  
Vol 3 (1) ◽  
pp. 99-106 ◽  
Author(s):  
E A Smirnova ◽  
A A Gusev ◽  
O N Zaitseva ◽  
E M Lazareva ◽  
G E Onishchenko ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Plant Cells ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes
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