Electrical conduction and rheological behaviour of composites of poly(ε-caprolactone) and MWCNTs

Chin, Seow Jecg; Vempati, Sesha; Dawson, Paul; Knite, Māris; Linarts, Artis; Ozols, Kaspars; McNally, Tony

doi:10.1016/j.polymer.2014.12.034

Cited by 64 publications

(51 citation statements)

References 51 publications

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“…The literature reports that the presence of CNTs significantly affects the crystallization behavior of PCL . In fact, CNTs are considered very efficient nucleation agents for PCL (supernucleation agents) and have produced significant increases in the crystallization temperature from the melt (14–17 °C), and in the degree of crystallinity (65% increase).…”

Section: Resultsmentioning

confidence: 99%

Morphology and properties of electrically and rheologically percolated PLA/PCL/CNT nanocomposites

Urquijo¹,

Dagréou

Guerrica-Echevarría³

et al. 2017

J of Applied Polymer Sci

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Poly(lactic acid)/poly(ɛ‐caprolactone)/carbon nanotube (PLA/PCL/CNT) nanocomposites (NCs) were melt‐processed in a conventional industrial‐like twin‐screw extruder maintaining a constant PLA/PCL 80/20 wt. ratio. CNTs located in the thermodynamically favored PCL phase and, as a result, the “sea–island” morphology of the unfilled blend was replaced by a more continuous PCL dispersed phase in the ternary NCs. Rheological and electrical percolation took place at the same CNT contents (over 1.2 wt %) that TEM images suggest continuity of the PCL phase. The electrical and the low‐strain mechanical behaviors upon CNT addition were similar in the reference binary PLA/CNT and ternary PLA/PCL/CNT NCs. In the percolated NCs, the conductivity became 106–107 times higher than in the insulating compositions, while the Young modulus increased linearly upon the addition of CNT (12% increase at 4.9 wt % loading). Moreover, all the PLA/PCL/CNT NCs showed a ductile behavior (elongation at break >130%) similar to that of the unfilled PLA/PCL blend (140%), in contrast to the brittle behavior of binary PLA/CNT NCs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45265.

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Section: Resultsmentioning

confidence: 99%

Morphology and properties of electrically and rheologically percolated PLA/PCL/CNT nanocomposites

Urquijo¹,

Dagréou

Guerrica-Echevarría³

et al. 2017

J of Applied Polymer Sci

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“…The mechanical properties such as tensile modulus, compressive modulus, tensile strength, storage modulus and elastic modulus increased with increasing MWCNTs content up to 0.5 wt%. However, the properties were more improved for the f-MWCNTs than for the pristine MWCNTs nanocomposites [41,62,68]. The improvement of these properties was related to the better dispersion of the f-MWCNTs in the polymer matrix that provided more uniform stress distribution, minimized the presence of stress-concentration centres, and increased the interfacial area for stress transfer from the polymer matrix to the MWCNTs [39,59,60,62,68].…”

Section: Mechanical and Thermo-mechanical Propertiesmentioning

confidence: 99%

“…Increasing the MWCNTs content above 0.5 wt% (especially for pristine MWCNTs) resulted in a decline in the mechanical properties of the nanocomposites. This was due to the formation of MWCNTs aggregates, which led to poor dispersion in the polymer matrix [41]. …”

Section: Mechanical and Thermo-mechanical Propertiesmentioning

confidence: 99%

“…No MWCNTs modification melt-mixing 0.2-0.5 wt% 0.20 wt% [40] No MWCNTs modification melt-mixing 0.05-5.0 wt% 0.30 wt% [41] No MWCNTs modification melt-mixing 0.5 wt% 2.00 wt% [42] Nitric acid-treatment in situ polymerization 0.5-5.0 wt% - [64] No MWCNTs modification melt blending 0.35-7.0 wt% 0.14 wt% [49] PC/MWCNTs masterbatch melt blending 0.5-4.0 wt% 0.5-1.0 wt% [50] interconnecting conductive pathway. The electrical conductivity values increased by more than one order of magnitude.…”

Section: Functionalization Technique Dispersion Technique Mwcnts Contmentioning

confidence: 99%

“…This is due to their low density, inertness and better compatibility than metal powders with most polymers. CNTs have shown to have greater potential than any other carbon-based nano-fillers (i.e., carbon black (CB), carbon nanofibres (CNF), and graphite) because of their unique one-dimensional structure with good electrical conductivity, as well as excellent mechanical and thermal properties [40][41][42]. These improved properties depend not only on the unique mechanical strength, large aspect ratio, and excellent thermal and electrical conductivities, but also on the alignment, adhesion, and dispersion in the polymer matrix.…”

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confidence: 99%

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Review on PCL, PBS, and PCL/PBS blends containing carbon nanotubes

Gumede¹,

Luyt²,

Müller³

2018

Express Polym. Lett.

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Abstract. Biodegradable polymers received considerable attention due to their contribution in the reduction of environmental concerns and the realization that global petroleum resources are finite. The development of double crystalline biobased blends such as poly(ε-caprolactone) (PCL) and poly(butylene succinate) (PBS) are particularly interesting because each component has an influence on the crystallization behaviour of the other component, and thus influences the strength and mechanical properties of a polymer blend. The lack of miscibility between PCL and PBS constitutes a bottleneck, and efforts have been made to improve the miscibility through the inclusion of copolymers. Having realized that incorporating conductive nanofillers such as carbon nanotubes (CNTs), (especially when the CNTs are functionalized or used as a masterbatch i.e., polycarbonate/MWCNTs masterbatch), into biopolymer matrices, can enhance the thermal and mechanical properties, as well as electrical and thermal conductivity, a lot of research was aimed at the production of bionanocomposites. This review paper discusses the properties of PCL, PBS, their blends, and their CNTs containing nanocomposites.

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Hybrid modification of high‐density polyethylene with hyperbranched polyethylene‐functionalized multiwalled carbon nanotubes and few‐layered graphene

Zheng

et al. 2017

J of Applied Polymer Sci

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Herein, a facile method has been reported to efficiently prepare debundled multiwalled carbon nanotubes (MWCNT) and few‐layered graphene using a hyperbranched polyethylene (HBPE), and as hybrid fillers, their modification effects on high‐density polyethylene (HDPE) are well demonstrated. Stable dispersions of debundled MWCNT and graphene in chloroform were respectively obtained by sonication using the HBPE as stabilizer, and MWCNT/graphene/HDPE ternary nanocomposites were then fabricated by solution‐assisted premixing and subsequent melt mixing, at a fixed mass ratio of MWCNT/graphene of 3:1 and serially changed filler loadings. It is found that the MWCNT and graphene have good dispersibility in the composites, and as hybrid fillers, they can effectively form composite net‐like structure, which makes them show better modification effects on both the electrically and thermally conductive properties of HDPE, as compared to the single MWCNT. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44848.

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Electrical conduction and rheological behaviour of composites of poly(ε-caprolactone) and MWCNTs

Cited by 64 publications

References 51 publications

Morphology and properties of electrically and rheologically percolated PLA/PCL/CNT nanocomposites

Morphology and properties of electrically and rheologically percolated PLA/PCL/CNT nanocomposites

Review on PCL, PBS, and PCL/PBS blends containing carbon nanotubes

Hybrid modification of high‐density polyethylene with hyperbranched polyethylene‐functionalized multiwalled carbon nanotubes and few‐layered graphene

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