Segregated polylactide/poly(butylene adipate‐co‐terephthalate)/MWCNTsnanocomposites with excellent electrical conductivity and electromagnetic interference shielding

Abstract

As plastic pollution becomes more serious, we need to find out eco‐friendly materials to alleviate the pollution. Polylactide (PLA) and poly (butylene adipate‐co‐terephthalate) (PBAT) will be one of the most attractive materials to replace those undegradable materials. However, few studies research the segregated conductive PLA/PBAT/MWCNTs nanocomposites. Herein, PLA/PBAT/MWCNTs nanocomposites with the segregated structure were successfully fabricated firstly. The MWCNTs are selectively dispersed in the continuous PBAT phase. The nanocomposite with segregated structure owns excellent electric conductivity. When the content of MWCNTs is 0.41 vol%, the electrical conductivity of composites with segregated structure is 9.43 × 10−4 S/m, which is about 5 orders higher than the nanocomposites without the segregated structure (1.75 × 10−10 S/m). The segregated nanocomposite with 2 wt% (1.18 vol%) MWCNTs owns excellent electromagnetic interference (EMI) of 24 dB, while the ordinary structure of composite is only 17 dB.

Facile production of binary polymer/carbonic nanofiller‐based biodegradable electromagnetic interference shield films with low electrical percolation threshold

“…The particular filler loading at which the tunneling distance is achieved is known as critical filler loading after crossing, no significant increment in electrical conductivity is observed although interparticle distance could be further reduced and charge carrying capacity of the polymer nanocomposite is increased. The tunneling phenomenon is represented by Equation (8) [ 19 ] : where p = wt% of fillers in the polymer nanocomposite. Figure 8C,F shows the linear relationship of log σ DC with p −1/3 which is in agreement with the tunneling phenomenon wherewith decrease in filler wt% p (or with an increase in p −1/3 ) logarithm of conductivity decreases linearly.…”

“…The particular filler loading at which the tunneling distance is achieved is known as critical filler loading after crossing, no significant increment in electrical conductivity is observed although interparticle distance could be further reduced and charge carrying capacity of the polymer nanocomposite is increased. The tunneling phenomenon is represented by Equation ( 8) [19] :…”

“…The need of the present‐day research in the field of composite science is the development of biodegradable polymer nanocomposite materials to apply as EMI shield material. Among various notable works Liu et al [ 19 ] designed segregated PLA/PBAT/MWCNT‐based polymer nanocomposites with 2 wt% of MWCNT loading giving 24 dB of EMI shielding effectiveness (SE). GO/thermoplastic poly (ethylene‐co‐methyl acrylate) based composites with enhanced dispersion of GO on the polymer matrix by treating the filler with distracting agent polyvinylpyrrolidone as a result only 20 wt% of filler loading had given EMI shielding efficiency as high as 30 dB.…”

Broadband microwave absorbing materials for green electronics based on poly (lactic acid)/ethylene‐vinyl acetate copolymer blends loaded with carbon nanotube

“…23 PLA has been compounded with CNT in the last decades to produce EMI shielding packaging materials for electronic industries. [24][25][26] With similar purpose, CNT was also added to heterogeneous polymer blends based on PLA with poly(butylene adipate-co-terephthalate) (PBAT), 27 poly hydroxybutyrate (PHB), 28 poly (ε-caprolactone) (PCL), 29,30 poly (vinylidene difluoride) (PVDF), 31 polypropylene 32 and poly (3-hydroxybutyrate-co-3-hydrooxyvalerate) (PHBV). 33 Most of these systems studied the effect of CNT on the EMI shielding effectiveness of the composite, except the last work 33 that used metal-backed approach to measure the attenuation of the reflection radiation or reflection loss (RL).…”

Strong and high void fraction PP/CNS nanocomposite foams fabricated by core‐back foam injection molding

“…In combination with attractive advantages of carbon-based nanocomposites, including ease of shaping, low cost, chemical resistance and tunable electrical properties, they have been widely applied in the sections of electromagnetic interference (EMI) shielding, conductors, sensors, and so forth. [3][4][5][6][7] Incorporating cell structure within carbon-based nanocomposites is a feasible method to reduce the weight of materials, and is favorable for their foamed samples' application in aircraft, automobiles and spacecraft. Furthermore, it has been dominated that the introduction of cell structure to carbon-based nanocomposites can provide considerable advantages in the application of EMI shielding.…”