Flow characteristic during injection molding of PC/MWNT nanocomposites
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Flow characteristic during injection molding of PC/MWNT nanocomposites Jai-Won Suh1, Yeong-Eun Yoo2 and Sun Kyoung Kim3,* Graduate School of NID Fusion Technology, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea 2 Nano-Mechanical Systems Research Division, Korea Institute of Machinery and Materials, Daejeon 34013, Republic of Korea 3 Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea (Received january 2, 2020; final revision received August 21, 2020; accepted August 24, 2020) 1
This work investigates the flow characteristic during injection molding process of PC/MWNT nanocomposites especially focusing on jetting. The initial flow pattern while filling has been compared with that of neat and other particle-filled PCs. The experimental results show that the flow of PC/MWNT 5% is comparable to that of PC/GF 15% and PC/CF 10%. It has been found that small amount of filled MWNT causes significant filling difficulty. Based on rheological investigations, this is attributed to extraordinary shear thinning by MWNT fillers. Keywords: injection molding, melt flow, PC, nanocomposites, MWNT
1. Introduction It has been proven that carbon nanotubes (CNT) can flexibly customize the properties of thermoplastics including elastic modulus, thermal conductivity, electrical conductivity, barrier property and so on (Bao and Tjong, 2008; Ganss et al., 2008; Richiter et al., 2009). Properties of CNT-based polymer composites are well described in a review by Pandey and Thostenson (2012). However, in comparison with other thermoplastic nanocomposites (Kumar et al., 2017), not many injection molding studies with CNT nanocomposites have been conducted. Recent advances in compounding of nanocomposites and reduced cost of CNT have enabled commercial distribution of pelletized CNT-filled thermoplastics. This has been successful with many polymers such as polypropylene, nylon 6, polymethylmethacrylate and polycarbonate (Bose et al., 2009; Kasaliwal et al., 2009; Moretti et al., 2010; Prashantha et al., 2009; Shu et al., 2009). Injection molding of CNT-filled thermoplastics have been tried to realize their desired characteristics in mass-produced parts. The multi-walled carbon nanotube (MWNT) is usually selected for such productions of plastic parts. Several studies have been fulfilled to examine properties of injection-molded MWNT thermoplastic composites (Lee et al., 2006; Liang et al., 2008; Muller et al., 2011; Rizvi and Bhatnagar, 2011; Villmow et al., 2008; Zhou et al., 2016). They highlighted on the relationship between molding conditions and the resulting properties such as strength and electrical resistivity. Recently, MWNT thermoplastics have been commer*Corresponding author; E-mail: [email protected]
© 2020 The Korean Society of Rheology and Springer
cially available thanks to successful dispersion by melt compounding (Zhou et al., 2016). For several thermoplastics, MWNT composites ar
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