Rheological behaviors and electrical conductivity of long-chain branched polypropylene/carbon black composites with different methods

Abstract

The isotactic polypropylene/carbon black (iPP/ CB) and the long-chain branched polypropylene/carbon black (LCBPP/CB) composite melts with the melt blending method and the solution process were chosen in this paper to know the relationship between rheological and electrical percolation process and learn the evolution and the destruction of rheological network. The more rheological percolation threshold than electrical percolation threshold in iPP/CB composites and the less rheological percolation threshold than electrical percolation threshold in LCBPP/CB composites are mainly attributed to the two kinds of mechanisms governing the electrical network and the rheological network. The agglomeration of CB particles which is accelerated by annealing at elevated temperatures promotes the selfperfection of rheological network. The strong interaction between the polar long-chain branched structure and filler also led to the reduced t p . The network of LCBPP/ CB composites is more difficult to be broken than the network of iPP/CB composites with the solution process.

Unveiling the restricted mobility of carbon nanotubes inside a long chain branched polymer matrix via probing the shear flow effects on the rheological and electrical properties of the filled systems

“…However, for larger diameters of graphene, the LCB interfered with the thermal conductive path inside the composite matrix. The rheological behaviors and electrical conductivities of LCB-PP/ carbon black composites were studied by Yian et al 26 In their case, the LCB was grafted onto the main chain and the monomer was trimethylol propane triacrylate which was able to enhance the interaction with the fillers. The engaged LCB thus enhanced the dispersion of fillers inside the polymer matrix, especially during the solution mixing process, causing a lower percolation threshold for both rheology and conductivity.…”

Characterization of antibacterial nanocomposites of polyethylene terephthalate filled with nanosilver-doped carbon black

“…31 CB has been generally used as fillers in polymers applied as conductive and reinforced materials. 32,33 However, CB has no antibacterial property beneficial for preventing antibacterial infections. Accordingly, we synthesized a new filler in the form of CB doped with nanosilver, which would simultaneously reinforce the tensile properties of PET and impart antibacterial properties to PET.…”

Self-Assembly of Block Copolymer Chains To Promote the Dispersion of Nanoparticles in Polymer Nanocomposites

“…The easiest and most applicable approach relies on introducing attractive interactions between the functionalized block of the copolymer chains and the surface of nanofillers, to effectively prevent them from a large-scale aggregation. − Block copolymer (BCP) nanocomposites have received substantial attention due to the long-range order of the corresponding matrix. , A large amount of research has focused on grafting BCP short chains onto the surface of NPs by generating chemical bonding. − In contrast to that, the cases in which BCP chains are physically attracted onto the surface of nanofillers, while the other end of BCP chain is kept chemically identical to the polymer matrix chains for a better dispersion, have not been studied in sufficient detail.…”