Electrical conductivity, phase behavior, and rheology of polypropylene/polystyrene blends with multi-walled carbon nanotube

Abstract

The electrical, rheological properties and phase change behavior of polypropylene (PP)/ polystyrene (PS) blends filled with multi-walled carbon nanotube (MWNT) were investigated. Two kinds of masterbatch were used to prepare ternary blends of PP, PS, and MWNT, and the effects of the kinds of masterbatch were confirmed by phase morphology of ternary blends and the distribution of MWNT. From thermodynamic analysis, MWNT is expected to locate in PS phase and it shows a good agreement with the TEM observations. The ternary composites show the lowest conductive percolation threshold and fine morphologies when most MWNT particles are located at the interface. Time sweep test were carried out to monitor the phase coalescence of the ternary blends and MWNT migration and agglomeration in the PS phase during annealing. The enhancement of thermal properties of MWNT-filled blends was also investigated by DSC and TGA.

Effect of double percolation on the electrical properties and electromagnetic interference shielding effectiveness of carbon‐black‐loaded polystyrene/ethylene vinyl acetate copolymer blends

“…Figure illustrates the variation of G ′ with the angular frequency for the PS/CB, PS/CB, and PS/EVA/CB blends. All of the composites presented gradual increases in G ′ as the amount of CB increased, and this behavior was more important at low frequencies and indicated the development of the CB network with increasing filler content . It was possible to observe a significant increase in G ′ between the unloaded systems and those containing only 2% CB; this suggested that the filler network structure started to form in this CB content range.…”

Conducting melt blending of polystyrene and EVA copolymer with carbon nanotube assisted by phosphonium‐based ionic liquid

“…This change in morphology may be related to the variation of the viscosity of the phase where the CNT is preferentially localized. Moreover, if the filler is localized at the interface, the chance of coalescence should decrease thus contributing for the formation of more elongated structures under shear stress, during melt mixing …”

“…Therefore, conducting composites based on this polymer can find potential applications in electronic components and equipments, which requires some specific characteristics, including EMI shielding and antistatic properties. Some reports have been discussed the effect of CNT, as well as, processing conditions on the morphology and electrical properties of PS blends containing polypropylene, low‐density polyethylene, or PVDF as the second blend component.…”

Double Percolation of Melt-Mixed PS/PBAT Blends Loaded With Carbon Nanotube: Effect of Molding Temperature and the Non-covalent Functionalization of the Filler by Ionic Liquid

“…By choosing a blend composition whose phase containing the percolated conductive filler is continuous or a blend with co-continuous structure, the amount of required conductive filler for attaining the insulator-conducting transition (percolation threshold) is usually lower that that employed in single polymer matrix. This phenomenon is known as double percolation and has been reported for several CNT-loaded thermoplastic binary blends, including acrylonitrile-butadienestyrene (ABS) copolymers with PA6 (Poyekar et al, 2014(Poyekar et al, , 2015a, ABS/ polycarbonate (PC) (Xiong et al, 2013), poly(Llactide) (PLA)/(EVA) (Shi et al, 2013), PS/PP (Hwang et al, 2012), PS/PE (Patra et al, 2015), PS/polyvinylidene fluoride (PVDF) (Ren et al, 2017), PS/EVA (Soares et al, 2018), and PS/PLA (Nasti et al, 2016).…”