Formation and stability of the conducting cluster in the composite filaments based on polylactide and carbon nanofibers

Abstract

Composite threads based on polylactide (PLA) containing up to 20 wt% carbon nanofibers (CNF) were produced using melt technology. The formation of a percolation cluster was studied in composite filaments with various morphologies (non‐oriented, subjected to isothermal crystallization, and oriented by six times). By adding 20 wt% CNF, a specific resistance of 100 Ohm m was achieved in the PLA filament. With orientation stretching, the specific resistance was 107 Ohm m, regardless of the CNF concentration. The scanning electron microscopy study showed poor adhesion between PLA and CNF. Threads containing 1 wt% CNF demonstrated stable conductive characteristics under dynamic loading for 24 h (50% of their breaking load). Studies of the creep of composite fibers have shown that small amounts of CNFs promote the sliding of polymer fibrils. In vivo tests showed that the addition of 5 wt% CNF led to an increase in the rate of bioresorption of PLA filaments. Additionally, the conductive properties were maintained for 12 months after implantation. The prepared filaments can be used in flexible electronics for biomedical applications.

A review on polylactic acid‐based blends/composites and the role of compatibilizers in biomedical engineering applications

“…Even after 12 months of implantation, the conductive properties were maintained. Although, the strength of composite filaments decreased by 20% of the initial value, while pure PLA filaments retained 55% of their original strength 360 . Among all these, GO has been widely explored due to high solubility, good biocompatibility and low cost.…”

Defects and residual stresses Finite Element prediction of FDM 3D printed Wood/PLA biocomposite

“…Its material properties are demonstrated in Table 3 [17,18]. Von Mises yield function was applied for both filler and matrix included in the model (8,9).…”

“…Previous research has indicated that the introduction of organic additives to PLA complicates the process-structureproperty relationship within FDM manufacturing. Despite extensive research efforts exploring the effects of various parameters, such as raster angle, additive volume, and layer height, on the mechanical properties and geometric precision of PLA/biocomposite components, a comprehensive understanding of the threshold relationship remains elusive [7,8].…”

Low percolation threshold polyvinylidene fluoride/multi‐walled carbon nanotube composites: A perspective of electrical conductivity, crystalline, rheological and mechanical properties

“…For CPC, the percolation threshold is the minimum amount of conductive filler needed to make the composite electrically conductive. 21 Common conductive fillers 22 used in CPC include metals, metal oxides, magnetic ferrites, and carbon-based materials, 23,24 etc. The conductivity of CPC is directly connected with the amount of conductive fillers present.…”