ELECTRICAL RESISTIVITY, CRYSTALLIZATION AND MECHENICAL PROPERTIES OF POLYPROPYLENE/MULTI-WALLED CARBON NANOTUBE/CALCIUM CARBONATE COMPOSITES PREPARED BY MELT MIXING

2009 ◽  
Vol 27 (03) ◽  
pp. 393 ◽  
Author(s):  
Ha-da Bao ◽  
Zhao-xia Guo ◽  
Jian Yu
Keyword(s):  
Electrical Resistivity ◽  
Carbon Nanotube ◽  
Calcium Carbonate ◽  
Melt Mixing ◽  
Multi Walled Carbon Nanotube

Experimental Research on the Conductive Property of MWCNT Nanopaper

2015 ◽  
Vol 727-728 ◽  
pp. 137-140
Author(s):  
A Ying Zhang
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistivity ◽  
Carbon Nanotube ◽  
Electrical Properties ◽  
The Self ◽  
Vacuum Deposition ◽  
Temperature Dependent ◽  
Polycarbonate Membrane ◽  
Multi Walled Carbon Nanotube ◽  
Conductive Property

This paper presents a systematic study of the nano-sized structure and temperature dependent electrical properties. A method of synthesizing the self-assembled multi-walled carbon nanotube (MWCNT) nanopaper on hydrophilic polycarbonate membrane was explored. The process is based on the very well-defined dispersion of nanotube and controlled pressure vacuum deposition procedure. The experiment results show that the ratio changes of MWCNT in the nanopaper could lead to the changes in the electrical conductivity efficiency of the nanopaper. Furthermore, the electrical resistivity of MWCNT nanopaper decreased as temperature increase.

scholarly journals Effect of Injection Molding Conditions on Crystalline Structure and Electrical Resistivity of PP/MWCNT Nanocomposites

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1685 ◽  
Author(s):  
Marta Zaccone ◽  
Ilaria Armentano ◽  
Federico Cesano ◽  
Domenica Scarano ◽  
Alberto Frache ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Injection Molding ◽  
Crystalline Structure ◽  
Processing Condition ◽  
Mold Temperature ◽  
Injection Rate ◽  
X Ray Diffraction ◽  
Melt Mixing ◽  
Cluster Morphology ◽  
Multi Walled Carbon Nanotube

Polypropylene (PP) / multi-walled carbon nanotube (MWCNT) nanocomposites were prepared by melt-mixing and used to manufacture samples by injection molding. The effect of processing conditions on the crystallinity and electrical resistivity was studied. Accordingly, samples were produced varying the mold temperature and injection rate, and the DC electrical resistivity was measured. The morphology of MWCNT clusters was studied by optical and electron microscopy, while X-ray diffraction was used to study the role of the crystalline structure of PP. As a result, an anisotropic electrical behavior induced by the process was observed, which is further influenced by the injection molding processing condition. It was demonstrated that a reduction of electrical resistivity can be obtained by increasing mold temperature and injection rate, which was associated to the formation of the γ-phase and the related inter-cluster morphology of the MWCNT conductive network.

Effect of Step-Heating on Microstructure and Mechanical Properties of Linear Low Density Polyethylene/Multi-Walled Carbon Nanotube Composites Prepared via Melt Mixing Process

2014 ◽  
Vol 979 ◽  
pp. 107-110
Author(s):  
Samor Boonphan ◽  
Pisith Singjai
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Testing Machine ◽  
Single Step ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Melt Mixing ◽  
Multi Walled Carbon Nanotube ◽  
Step Heating

Step-heating (single-and four-step heating) was used in the melt-mixing preparation of linear low density polyethylene (LLDPE)/multi-walled carbon nanotube (MWNT) composites. The MWNT in the composites were used at volume fractions of 0, 1, 3, 5, and 10 vol% (four-step heating), and 0, 1, 3, and 5 vol% (single-step heating). The effects of the heating steps on the microstructure of the LLDPE/MWNT composites were studied. An ultimate tensile testing machine and an impact testing machine were used to characterize the mechanical properties of the composites. The sample prepared using four-step heating had a lower porosity than the sample prepared using single-step heating. The sample with 3 vol% MWNT that was prepared using four-step heating had tensile strength, elastic modulus, and impact strength values that were higher than those of the other samples.

Effect of Annealing on the Mechanical and Electrical Behavior of Polyurethane/Multi-Walled Carbon Nanotube Nanocomposites

2016 ◽  
Vol 699 ◽  
pp. 8-17
Author(s):  
Ionut Laurentiu Sandu ◽  
Razvan Rosculet ◽  
Catalin Fetecau
Keyword(s):  
Carbon Nanotube ◽  
Thermoplastic Polyurethane ◽  
Young Modulus ◽  
Melt Mixing ◽  
Time Intervals ◽  
Mechanical And Electrical Properties ◽  
Multi Walled Carbon Nanotube ◽  
Before And After ◽  
Injection Molded ◽  
Percolation Thresholds

The objective of this research is to investigate the effect of the annealing process on the mechanical and electrical properties of thermoplastic polyurethane/multi-walled carbon nanotube (TPU/MWCNT) nanocomposites. The TPU/MWCNT nanocomposites were prepared by melt-mixing the TPU with 1, 3, and 5 wt.% MWCNT. The TPU/MWCNT injection-molded specimens were annealed at 110°C at different annealing time intervals. The mechanical properties of TPU/MWCNT nanocomposites (Young modulus, tensile strength at yield, stress at break and strain at break) were measured before and after the annealing at constant crosshead speed of 100 mm/min. Furthermore, the DC conductivity of the TPU/MWCNT injection molding specimens was measured before and after annealing, and the percolation thresholds were determined based on following the percolation theory.

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