Effect of WS2 Inorganic Nanotubes on Isothermal Crystallization Behavior and Kinetics of Poly(3-Hydroxybutyrate-co-3-hydroxyvalerate)

Silverman, Tyler; Naffakh, Mohammed; Marco, Carlos; Ellis, Gary

doi:10.3390/polym10020166

Cited by 9 publications

(7 citation statements)

References 40 publications

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“…Thus, a significant enhancement in the thermal stability of the PHBV polymer, an efficient nucleation effect, and a good dispersion can be achieved when blending this biopolymer with WS 2 , in comparison with that obtained with other reinforcement nanomaterials or specific nucleating agents, which provide these nanocomposites a broad range of applications in the field of sustainability and biomedicine [125]. In addition, very recent nanocomposites of PHBV and low loadings of tungsten disulphide inorganic nanotubes (INT-WS 2 ) increased the crystallization rates of PHBV, due to the high nucleation efficiency of INT-WS 2 on the crystallization of PHBV [126].…”

Section: Mechanical Reinforcementmentioning

confidence: 99%

Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate): Enhancement Strategies for Advanced Applications

2018

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Poly(3-hydroxybutyrate- co -3-hydroxyvalerate), PHBV, is a microbial biopolymer with excellent biocompatible and biodegradable properties that make it a potential candidate for substituting petroleum-derived polymers. However, it lacks mechanical strength, water sorption and diffusion, electrical and/or thermal properties, antimicrobial activity, wettability, biological properties, and porosity, among others, limiting its application. For this reason, many researchers around the world are currently working on how to overcome the drawbacks of this promising material. This review summarises the main advances achieved in this field so far, addressing most of the chemical and physical strategies to modify PHBV and placing particular emphasis on the combination of PHBV with other materials from a variety of different structures and properties, such as other polymers, natural fibres, carbon nanomaterials, nanocellulose, nanoclays, and nanometals, producing a wide range of composite biomaterials with increased potential applications. Finally, the most important methods to fabricate porous PHBV scaffolds for tissue engineering applications are presented. Even though great advances have been achieved so far, much research needs to be conducted still, in order to find new alternative enhancement strategies able to produce advanced PHBV-based materials able to overcome many of these challenges.

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Section: Mechanical Reinforcementmentioning

confidence: 99%

Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate): Enhancement Strategies for Advanced Applications

2018

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“…These NTs possess interesting mechanical, − thermal, − optical, and electrical , properties that can benefit a wide range of applications. Additionally, WS 2 NTs have also been shown to be non-toxic and biocompatible. − Recent developments have also shown the potential of WS 2 NTs for application in energy storage, the medical industry ,,, such as a radio-opaque additive for bioresorbable vascular scaffolds, and as a functional filler for polymer composites. − …”

Section: Introductionmentioning

confidence: 99%

WS₂ Nanotubes as a 1D Functional Filler for Melt Mixing with Poly(lactic acid):Implications for Composites Manufacture

Magee

Tang

Ozdemir

et al. 2022

ACS Appl. Nano Mater.

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Multi-walled WS 2 nanotubes (NTs) with lengths ranging from 2 to 65 μm and widths from 50 to 110 nm were synthesized in a horizontal quartz-made reactor by a process yielding NTs with aspect ratios (ARs) between ∼40 and >1000. The NTs obtained were thermally stable in air up to 400 °C but were oxidized within the temperature range 400−550 °C to produce yellow WO 3 particles. Critically, 400 °C is well above the temperature used to mix additives with the majority of meltprocessable polymers. The hydrophilic WS 2 NTs were easily dispersed in poly(lactic) acid (PLA) using a twin-screw extruder, but the shear stresses applied during melt mixing resulted in chopping of the NTs such that the AR decreased by >95% and the tensile mechanical properties of the PLA were unchanged. Although the as-extruded unfilled PLA was >99% amorphous, the much-shortened WS 2 NTs had a significant effect on the crystallization behavior of PLA, inducing heterogeneous nucleation, increasing the crystallization temperature (T c ) by ∼3 °C and the crystalline content by 15%, and significantly increasing the rate of PLA crystallization, producing smaller and more densely packed spherulites. The reduction in the AR and the nucleating effect of WS 2 NTs for PLA are critical considerations in the preparation, by melt mixing, of composites of rigid 1D NTs and polymers, irrespective of the target application, including bone tissue engineering and bioresorbable vascular scaffolds.

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“…Biocompatibility is a prime concern in this case since otherwise the nanocomposite may not be suitable for biomedical applications. Several reports on the effect of nanotubes and fullerene-like nanoparticles of WS 2 incorporated in biodegradable/biocompatible polymers such as PLLA [51], poly(3-hydroxybutyrate) (PHB) [52], Poly(3-Hydroxybutyrate-co-3-hydroxyvalerate) (PHVB) [53], and others have appeared. These studies focused on the crystallization process of these thermoplastic polymers.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2

et al. 2019

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Composites of poly(l-lactic acid) (PLLA) reinforced by adding inorganic nanotubes of tungsten disulfide (INT–WS2) were prepared by solvent casting. In addition to the pristine nanotubes, PLLA nanocomposites containing surface modified nanotubes were studied as well. Several surface-active agents, including polyethylene imine (PEI), were studied in this context. In addition, other biocompatible polymers, like poly d,l-lactic acid (PDLLA) and others were considered in combination with the INT–WS2. The nanotubes were added to the polymer in different proportions up to 3 wt %. The dispersion of the nanotubes in the nanocomposites were analyzed by several techniques, including X-ray tomography microscopy (Micro-XCT). Moreover, high-temperature rheological measurements of the molten polymer were conducted. In contrast to other nanoparticles, which lead to a considerable increase of the viscosity of the molten polymer, the WS2 nanotubes did not affect the viscosity significantly. They did not affect the complex viscosity of the molten PLLA phase, either. The mechanical and tribological properties of the nanocomposites were found to improve considerably by adding the nanotubes. A direct correlation was observed between the dispersion of the nanotubes in the polymer matrix and its mechanical properties.

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Effect of WS2 Inorganic Nanotubes on Isothermal Crystallization Behavior and Kinetics of Poly(3-Hydroxybutyrate-co-3-hydroxyvalerate)

Cited by 9 publications

References 40 publications

Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate): Enhancement Strategies for Advanced Applications

Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate): Enhancement Strategies for Advanced Applications

WS₂ Nanotubes as a 1D Functional Filler for Melt Mixing with Poly(lactic acid):Implications for Composites Manufacture

Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2

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Effect of WS2 Inorganic Nanotubes on Isothermal Crystallization Behavior and Kinetics of Poly(3-Hydroxybutyrate-co-3-hydroxyvalerate)

Cited by 9 publications

References 40 publications

Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate): Enhancement Strategies for Advanced Applications

Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate): Enhancement Strategies for Advanced Applications

WS2 Nanotubes as a 1D Functional Filler for Melt Mixing with Poly(lactic acid):Implications for Composites Manufacture

Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2

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Product

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WS₂ Nanotubes as a 1D Functional Filler for Melt Mixing with Poly(lactic acid):Implications for Composites Manufacture