Achieving a low electrical percolation threshold and superior mechanical performance in poly(<scp>l</scp>-lactide)/thermoplastic polyurethane/carbon nanotubes composites via tailoring phase morphology with the aid of stereocomplex crystallites

Liu, Zhenwei; Bai, Hongwei; Luo, Yuanlin; Zhang, Qin; Fu, Qiang

doi:10.1039/c6ra27401c

Cited by 20 publications

(9 citation statements)

References 64 publications

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“…21 CNTs are also used to modify the properties of polymer-polymer composites. [22][23][24] For example, when the content of MWCNTs was 5 wt% in PET/LDPE blends (mass ratio ¼ 20 : 80), Cardinaud et al 22 found that the MWCNTs had little effect on the rheological properties of the blends. The melt viscosity increased as the content of the MWCNTs increased.…”

Section: Introductionmentioning

confidence: 99%

Effect of multi-walled carbon nanotubes on the physical properties and crystallisation of recycled PET/TPU composites

et al. 2018

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Section: Introductionmentioning

confidence: 99%

Effect of multi-walled carbon nanotubes on the physical properties and crystallisation of recycled PET/TPU composites

et al. 2018

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“…Table 5 gives the values for φc with the PLA percentage of the blend. Depending on the conditions for the selective localization of CB at the interface or in one of the polymer phases, in this case PHBV, φc changes with the relative amounts of the polymer phases in the system [59,60]. Other researchers have seen a similar optimization in the mechanical properties for a related 80:20 system [61].…”

Section: Resultsmentioning

confidence: 99%

Incorporation of Carbon Nanofillers Tunes Mechanical and Electrical Percolation in PHBV:PLA Blends

Arroyo

Ryan

2018

Polymers

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Biobased fillers, such as bio-derived cellulose, lignin byproducts, and biochar, can be used to modify the thermal, mechanical, and electrical properties of polymer composites. Biochar (BioC), in particular, is of interest for enhancing thermal and electrical conductivities in composites, and can potentially serve as a bio-derived graphitic carbon alternative for certain composite applications. In this work, we investigate a blended biopolymer system: poly(lactic acid) (PLA)/poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV), and addition of carbon black (CB), a commonly used functional filler as a comparison for Kraft lignin-derived BioC. We present calculations and experimental results for phase-separation and nanofiller phase affinity in this system, indicating that the CB localizes in the PHBV phase of the immiscible PHBV:PLA blends. The addition of BioC led to a deleterious reaction with the biopolymers, as indicated by blend morphology, differential scanning calorimetry showing significant melting peak reduction for the PLA phase, and a reduction in melt viscosity. For the CB nanofilled composites, electrical conductivity and dynamic mechanical analysis supported the ability to use phase separation in these blends to tune the percolation of mechanical and electrical properties, with a minimum percolation threshold found for the 80:20 blends of 1.6 wt.% CB. At 2% BioC (approximately the percolation threshold for CB), the 80:20 BioC nanocomposites had a resistance of 3.43 × 10 8 Ω as compared to 2.99 × 10 8 Ω for the CB, indicating that BioC could potentially perform comparably to CB as a conductive nanofiller if the processing challenges can be overcome for higher BioC loadings.

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“…Recently, a variety of methods have been proposed to lower the percolation threshold of the conductive composites 7–9 . Among them, a constructive way is to construct conductive composites with double percolation structure 10–12 .…”

Section: Introductionmentioning

confidence: 99%

Relationship between microstructure evolution and properties enhancement of carbon nanotubes‐filled polybutylene terephthalate/polypropylene blends induced by thermal annealing

Shang

Gao

Cheng

et al. 2021

J of Applied Polymer Sci

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Thermal annealing induced microstructure evolution and properties enhancement of polybutylene terephthalate/polypropylene/carbon nanotubes (PBT/PP/CNTs) nanocomposites was methodically investigated. The electrical conductive PBT/PP/CNTs nanocomposites with a low percolation threshold were obtained by simple melt blending due to the selective location of the CNTs in PBT phase and the formation of the double percolation structure. Thermal annealing further remarkably decreased the volume resistivity of the nanocomposites, with the maximum reduction of seven orders of magnitude. Scanning electron microscope observation and rheology tests demonstrated that the relatively large CNTs agglomerates were redistributed to build more homogeneous CNTs networks after annealing. The phase coalescence during annealing promoted the formation of the more perfect co‐continuous structure. These phenomena helped to enhance the electrical conductivity of the nanocomposites. Flexural properties of the nanocomposites were also enhanced after annealing, which might be due to the more effective stress transfer between the polymer and CNTs induced by the reconstructed CNTs networks. The nanocomposites obtained in this study possess excellent electrical and mechanical properties, which can be applied to the fields of sensors, electromagnetic interference shielding, anti‐static materials, and so forth.

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Achieving a low electrical percolation threshold and superior mechanical performance in poly(l-lactide)/thermoplastic polyurethane/carbon nanotubes composites via tailoring phase morphology with the aid of stereocomplex crystallites

Abstract: We demonstrate a facile strategy to fabricate highly conductive PLLA/TPU/CNTs composites with very low percolation threshold and good stiffness–toughness balance via constructing stereocomplex crystallites in PLLA melt to tailor phase morphology.

Cited by 20 publications

References 64 publications

Effect of multi-walled carbon nanotubes on the physical properties and crystallisation of recycled PET/TPU composites

Effect of multi-walled carbon nanotubes on the physical properties and crystallisation of recycled PET/TPU composites

Incorporation of Carbon Nanofillers Tunes Mechanical and Electrical Percolation in PHBV:PLA Blends

Relationship between microstructure evolution and properties enhancement of carbon nanotubes‐filled polybutylene terephthalate/polypropylene blends induced by thermal annealing

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