Influence of polymer structure on the electrical resistivity of nanocomposite materials

Al‐Saleh, Mohammed H.

doi:10.1016/j.synthmet.2020.116409

Cited by 11 publications

(9 citation statements)

References 33 publications

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“…It is worth mentioning that the scPLA crystals are typically lamellar with a thickness of about 9-15 nm with a similar interlamellar distance. [39,45] It seems that this scenario is more representative of our system.…”

Section: Electrical Conductivitymentioning

confidence: 97%

“…[34][35][36][37] Further observations have been reported in the literature concerning the dispersion and distribution of MWCNTs in various matrices. [22,38,39] In this paper, a specific effort was made to find the best conditions for dispersing MWCNTs in PLA via melt mixing using a co-rotating TSE. To achieve this, various PLAs were considered, including those with a low (l)and a high (h)-molecular-weight, amorphous (a) with higher D-lactic acid equivalent content, and semicrystalline (sc) PLAs (aPLAl, aPLAh, scPLAl, and scPLAh, respectively).…”

Section: Introductionmentioning

confidence: 99%

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Effects of molecular weight, stereo configuration of PLA, and processing on the dispersion of multiwalled carbon nanotubes and properties of corresponding nanocomposites

Mohammadi

Randall

et al. 2023

Can J Chem Eng

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Multiwalled carbon nanotubes (MWCNTs) were dispersed and distributed via a co‐rotating twin‐screw extruder (TSE) in high (h)‐ and low (l)‐molecular‐weight amorphous and semicrystalline polylactides (PLAs) (aPLA and scPLA, respectively). Effects of PLA molecular weight and D‐lactic acid equivalents content (D‐content), as well as processing parameters, were examined on the MWCNT dispersion quality in PLA. The effectiveness of the MWCNT dispersion in various PLA matrices was investigated using scanning electron microscopy (SEM) and small‐amplitude oscillatory and transient shear flow rheometry in the molten state. The results showed a better dispersion of MWCNTs in the low‐molecular‐weight PLA grades (aPLAl and scPLAl). In addition, better MWCNT dispersion was observed in aPLA grades when processed at a higher temperature of 190°C than at 150°C. At 150°C, while MWCNT bundles in aPLAl could be broken down, a good dispersion could not be achieved in aPLAh due to the lower molecular mobility at such a temperature. The electrical conductivity of the samples was also shown to increase as the MWCNT dispersion was improved. The existence of crystallites in scPLA‐based nanocomposites, however, disrupted the connectivity of the MWCNTs and decreased the final electrical conductivity. The lower molecular weight aPLAl prepared at 190°C showed the highest electrical conductivity (~10−5 S/m) at a low loading of 0.5 wt.% MWCNTs.

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Section: Electrical Conductivitymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effects of molecular weight, stereo configuration of PLA, and processing on the dispersion of multiwalled carbon nanotubes and properties of corresponding nanocomposites

Mohammadi

Randall

et al. 2023

Can J Chem Eng

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“…The higher the filler loading, the lower the composite ductility and formability. 123 Formation of double percolation structure can be taken account of a practical approach to achieve higher value of conductivity in lower percolation threshold. 124 In multi-phase matrixes, the filler particles can be selectively localized in each of phases or interphase areas which in turn facilitates the conductive path formation and increases the electrical conductivity.…”

Section: Filler Dispersionmentioning

confidence: 99%

“…The high filler loading can compromise the mechanical properties of the resulting composites. The higher the filler loading, the lower the composite ductility and formability 123 …”

Section: Polyurethanesmentioning

confidence: 99%

“…It has been documented that the electrical conductivity of the composites can be adjusted by changing the polymer crystallinity. However, the exact relation between the electrical conductivity and the crystallinity is still under‐questioned 123 . Increasing the polymer crystallinity can give rise to a higher, lower or even unchanged electrical conductivity of the nanocomposites.…”

Section: Polyurethanesmentioning

confidence: 99%

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A review on electrically conductive polyurethane nanocomposites: From principle to application

Jafarzadeh,

Farzaneh,

Haddadi‐Asl

et al. 2023

Polymer Composites

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Polyurethanes (PUs) thanks to the occurrence of phase separation and biphasic structure prevail over other polymer matrixes for impregnation of conductive fillers and production of conductive composites. A number of carbonous fillers including carbon black, carbon fiber, carbon nanotube, graphite and its derivatives, and fullerene can be loaded into the PU matrixes to impart electrical conductivity. The properties of the carbonous fillers, the filler/PU interactions, and the method of compositing determine the conductive performance of the composite. It is possible to modulate the properties of the conductive PU composites and employ them for a number of electronic applications including but not limited to the strain sensors, electromagnetic interference shielding materials, supercapacitors, and tissue engineering scaffolds. In the present review, first, the distinctive properties of PU as a matrix of conductive composites have been discussed. Then, various carbon fillers loaded into the PU matrixes and their structural and conductive properties have been debated. Thereafter, the fabrication methods of the conductive composites as well as the influential parameters on the electrical properties of the composites have been reviewed to provide an insight into how fulfill a PU composite with the desired electrical performance. And finally, a number of applications of conductive PU composites have been put forward.Highlights Polyurethanes are very capable matrixes for conductive composites. Carbonous fillers can be loaded into the PU matrixes to impart conductivity. Conductive PU composites are employed for a number of electronic applications. Herein, properties, fillers, and applications of PU composites are reviewed.

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Properties of blends of amorphous and semicrystalline PLAs containing multiwalled carbon nanotubes

Mohammadi,

Nofar,

Carreau

2024

Can J Chem Eng

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Blend nanocomposites of amorphous polylactide (aPLA) and semicrystalline PLA (scPLA)‐multiwalled carbon nanotubes (MWCNTs) were prepared by a twin‐screw extruder below the melting temperature of the scPLA. The maximum weight percent of MWCNTs in the blends was 0.9 wt.%. The extrudates were either pelletized immediately or after drawing at a drawing ratio of about 10. According to small amplitude oscillatory shear rheological analysis, the rheological properties of the aPLA/scPLA (85/15 wt.%) drawn sample were significantly increased compared to the undrawn samples. With the presence of MWCNTs, more crystallites could develop in the scPLA, and the electrical conductivity of the aPLA/scPLA nanocomposites was reduced due to the encapsulation of MWCNTs within the crystallites of scPLA. Increasing the temperature during compression moulding to 190°C, which is above the melting temperature of the scPLA, effectively removed this obstacle and the electrical conductivity was increased by a factor of up to 106 compared to the samples moulded at 150°C.

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Influence of polymer structure on the electrical resistivity of nanocomposite materials

Cited by 11 publications

References 33 publications

Effects of molecular weight, stereo configuration of PLA, and processing on the dispersion of multiwalled carbon nanotubes and properties of corresponding nanocomposites

Effects of molecular weight, stereo configuration of PLA, and processing on the dispersion of multiwalled carbon nanotubes and properties of corresponding nanocomposites

A review on electrically conductive polyurethane nanocomposites: From principle to application

Properties of blends of amorphous and semicrystalline PLAs containing multiwalled carbon nanotubes

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