Highly Thermally Conductive yet Electrically Insulative Polycarbonate Composites with Oriented Hybrid Networks Assisted by High Shear Injection Molding

2021 ◽  
pp. 2100632
Author(s):  
Yang Bai ◽  
You Shi ◽  
Shengtai Zhou ◽  
Huawei Zou ◽  
Mei Liang
Keyword(s):  
Injection Molding ◽  
Hybrid Networks ◽  
High Shear ◽  
Thermally Conductive

scholarly journals The Influence of Injection Molding Parameter on Properties of Thermally Conductive Plastic

2017 ◽  
Vol 203 ◽  
pp. 012018
Author(s):  
N. Hafizah Azis ◽  
M. Zulafif Rahim ◽  
Nasuha Sa’ude ◽  
N. Rafai ◽  
M.S. Yusof ◽  
...  
Keyword(s):  
Injection Molding ◽  
Thermally Conductive ◽  
Molding Parameter

Effects of molding on property of thermally conductive and electrically insulating polyamide 6–based composite

2018 ◽  
Vol 32 (9) ◽  
pp. 1190-1203 ◽  
Author(s):  
Xuping Yang ◽  
Wenbin Yang ◽  
Jinghui Fan ◽  
Juying Wu ◽  
Kai Zhang
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Injection Molding ◽  
Annealing Time ◽  
Polyamide 6 ◽  
Molding Pressure ◽  
Hot Press ◽  
Molding Method ◽  
Thermally Conductive ◽  
Press Molding

Thermally conductive and electrically insulating polyamide 6 (PA6) matrix quaternary composites were prepared by hot press molding and injection molding, respectively. The quaternary composites were composed of zero-dimensional aluminum oxide particle, one-dimensional silicon carbide whisker, two-dimensional flake graphite, and PA6 resin matrix. Morphology, structure, density, thermal conductivity, volume electrical resistivity, and tensile strength of two types of composites were characterized by scanning electron microscopy, X-ray diffractometer, thermal conductivity tester, high resistance micro-current tester, and tensile tester. The results showed that crystallinity, thermal conductivity, density, and tensile strength of hot press molding samples were superior to those of samples made by injection molding method. This is due to that hot press molding method can provide higher molding pressure and longer annealing time than injection molding. The mechanism could be explained that the performances of the composites were promoted by increasing molding pressure and annealing time.

scholarly journals Effects of Three Different Injection-Molding Methods on the Mechanical Properties and Electrical Conductivity of Carbon Nanotube/Polyethylene/Polyamide 6 Nanocomposite

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1779
Author(s):  
Dashan Mi ◽  
Zhongguo Zhao ◽  
Wenli Zhu
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Shear Stress ◽  
Injection Molding ◽  
Oscillatory Shear ◽  
High Shear ◽  
Shear Forces ◽  
Oscillatory Shear Stress ◽  
Molding Methods ◽  
Conventional Injection Molding

Morphological evolution under shear, during different injection processes, is an important issue in the phase morphology control, electrical conductivity, and physical properties of immiscible polymer blends. In the current work, conductive nanocomposites were produced through three different injection-molding methods, namely, conventional injection molding, multi-flow vibration injection molding (MFVIM), and pressure vibration injection molding (PVIM). Carbon nanotubes in the polyamide (PA) phase and the morphology of the PA phase were controlled by various injection methods. For MFVIM, multi-flows provided consistently stable shear forces, and mechanical properties were considerably improved after the application of high shear stress. Shear forces improved electrical property along the flow direction by forming an oriented conductive path. However, shear does not always promote the formation of conductive paths. Oscillatory shear stress from a vibration system of PVIM can tear a conductive path, thereby reducing electrical conductivity by six orders of magnitude. Although unstable high shear forces can greatly improve mechanical properties compared with the conventional injection molding (CIM) sample, oscillatory shear stress increases the dispersion of the PA phase. These interesting results provide insights into the production of nanocomposites with high mechanical properties and suitable electrical conductivity by efficient injection molding.

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