WS2 nanotubes embedded in PMMA nanofibers as energy absorptive material

Reddy, Chaganti Srinivasa; Zak, Alla; Zussman, Eyal

doi:10.1039/c1jm12700d

Cited by 93 publications

(75 citation statements)

References 45 publications

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“…Promising results have also been recently found with respect to the biocompatibility of INT(IF)-WS 2 with salivary gland cells [21]. With such excellent properties, and relatively simple and inexpensive fabrication, the incorporation of INT-WS 2 in polymer systems has become increasingly important [22][23][24][25].…”

Section: Introductionmentioning

confidence: 82%

Non-Isothermal Cold-Crystallization Behavior and Kinetics of Poly(l-Lactic Acid)/WS2 Inorganic Nanotube Nanocomposites

2015

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Abstract:In order to accelerate the crystallization of poly(L-lactic acid) (PLLA) biopolymer and enhance its crystallizability, biocompatible and environmentally friendly tungsten disulphide inorganic nanotubes (INT-WS 2 ) were introduced into the polymer matrix. The non-isothermal cold-crystallization and subsequent melting behaviour of pure PLLA and PLLA/INT-WS 2 nanocomposites were investigated in detail by varying both the heating rate and INT-WS 2 loading. The kinetic parameters of the cold-crystallization process of PLLA chains under confined conditions, successfully described using Liu model, shows that the addition of INT-WS 2 significantly increased the crystallization rate and reduced the total cold-crystallinity of PLLA, while the crystallization mechanism and crystal structure of PLLA remained unchanged in spite of the INT-WS 2 loading. Similarly, the final crystallinity and melting behaviour of PLLA were controlled by both the incorporation INT-WS 2 and variation of the heating rate. The differential isoconversional method of Friedman was applied to estimate the dependence of the effective activation energy on the relative crystallinity and temperature for PLLA and PLLA/INT-WS 2 . On the other hand, the double-melting peaks, mainly derived from melting-recrystallization-melting processes upon heating, and their dynamic behaviour is coherent with a remarkable nucleation-promoting effect of INT-WS 2 involved in accelerating the cold-crystallization of PLLA. These observations have considerable practical significance for the future sustainable, economic and effective technological utilisation of PLLA, as it will enable the development of novel melt-processable biopolymer nanocomposite materials.

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Section: Introductionmentioning

confidence: 82%

Non-Isothermal Cold-Crystallization Behavior and Kinetics of Poly(l-Lactic Acid)/WS2 Inorganic Nanotube Nanocomposites

2015

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“…Transmission electron microscopy (TEM) analysis of one such nanotube has shown that the typical INTs are 50-100 nm thick made of 20-30 layers with an interlayer spacing of about 0.62 nm. 22,23 Each mixture of PLLA and INT-WS 2 (0.1, 0.5 and 1.0 wt.%) was dispersed in a small volume of ethanol and homogenized by mechanical stirring and bath ultrasonication for approximately 10 min. Subsequently, the dispersion was partially dried under vacuum at 60°C under a pressure of about 70 mbar for 24 h. The meltmixing of the resulting dispersion was performed using a micro-extruder (Thermo-Haake Minilab system) operated at 190°C and a rotor speed of 100 rpm for 10 min.…”

Section: Materials and Processingmentioning

confidence: 99%

“…The moderate cost of such nanostructures has opened potential applications in catalysis, rechargeable batteries, drug delivery, solar cells and electronics and, more recently, in the field of polymer nanocomposites. 21 In this respect, WS 2 nanotubes (INT-WS 2 ) have been used as reinforcing agents to improve the mechanical and tribological properties of epoxy composites, 22 electrospun poly(methyl methacrylate) fibers 23 and poly(propylene fumarate) (PPF) nanocomposites. 24 To the best of our knowledge, this is the first report on the preparation and characterization of biodegradable PLLA polymer nanocomposites based on environmentally friendly inorganic nanotubes (INT-WS 2 ).…”

Section: Introductionmentioning

confidence: 99%

Development of novel melt-processable biopolymer nanocomposites based on poly(l-lactic acid) and WS2 inorganic nanotubes

2014

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The use of tungsten disulphide inorganic nanotubes (INT-WS 2 ) offers the opportunity to produce novel and advanced biopolymer-based nanocomposite materials with excellent nanoparticle dispersion without the need for modifiers or surfactants via conventional melt blending. The study of the non-isothermal melt-crystallization kinetics provides a clear picture of the transformation of poly(L-lactic acid) (PLLA) molecules from the non-ordered to the ordered state. The overall crystallization rate, final crystallinity and subsequent melting behaviour of PLLA were controlled by both the incorporation of INT-WS 2 and the variation of the cooling rate. In particular, it was shown that INT-WS 2 exhibits much more prominent nucleation activity on the crystallization of PLLA than other specific nucleating agents or nano-sized fillers. These features may be advantageous for the enhancement of mechanical properties and processability of PLLA-based materials. PLLA/INT-WS 2 nanocomposites can be employed as low cost biodegradable materials for many eco-friendly and medical applications, and the exceptional crystallization behaviour observed opens new perspectives for scale-up and broader applications.

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“…18 Taking advantage of this achievement, high-performance materials with different morphologies, such as epoxy/INT-WS 2 and PMMA/INT-WS 2 nanofibers, have been successfully developed. 19,20 In particular, the enhancement reported in stiffness and toughness of PMMA fiber meshes with INT-WS 2 predicts their potential usage as high energy transparent materials with adjustable polarizability and dielectric constants. 20 The present work is focused on the analysis of the influence of INT-MoS 2 loading on the structure-property-performance relationship of iPP/INT-MoS 2 nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

“…19,20 In particular, the enhancement reported in stiffness and toughness of PMMA fiber meshes with INT-WS 2 predicts their potential usage as high energy transparent materials with adjustable polarizability and dielectric constants. 20 The present work is focused on the analysis of the influence of INT-MoS 2 loading on the structure-property-performance relationship of iPP/INT-MoS 2 nanocomposites. In particular, the processability and dispersion of INT-MoS 2 were considered when evaluating thermal, tribological and mechanical response and performance of these new formulations in comparison with those previously reported in other iPP nanocomposite systems.…”

Section: Introductionmentioning

confidence: 99%

New inorganic nanotube polymer nanocomposites: improved thermal, mechanical and tribological properties in isotactic polypropylene incorporating INT-MoS2

et al. 2012

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Environmentally friendly molybdenum disulfide (INT-MoS 2 ) inorganic nanotubes were introduced into an isotactic polypropylene (iPP) polymer matrix to generate novel nanocomposite materials through an advantageous melt-processing route. The effects of INT-MoS 2 content on the thermal, mechanical and tribological properties were investigated. The incorporation of INT-MoS 2 generates notable performance enhancements through reinforcement effects, highly efficient nucleation activity and excellent lubricating ability in comparison with other nanoparticle fillers such as nanoclays, carbon nanotubes, silicon nitrides and halloysite nanotubes. It was shown that these INT-MoS 2 nanocomposites can provide an effective balance between performance, cost effectiveness and processability, and should be of some interest in the area of multifunctional polymer nanocomposite materials.

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WS2 nanotubes embedded in PMMA nanofibers as energy absorptive material

Cited by 93 publications

References 45 publications

Non-Isothermal Cold-Crystallization Behavior and Kinetics of Poly(l-Lactic Acid)/WS2 Inorganic Nanotube Nanocomposites

Non-Isothermal Cold-Crystallization Behavior and Kinetics of Poly(l-Lactic Acid)/WS2 Inorganic Nanotube Nanocomposites

Development of novel melt-processable biopolymer nanocomposites based on poly(l-lactic acid) and WS2 inorganic nanotubes

New inorganic nanotube polymer nanocomposites: improved thermal, mechanical and tribological properties in isotactic polypropylene incorporating INT-MoS2

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